Merge branch 'cpu-features' into next: Improve CPU feature detection in volk_gnsssdr library

The volk_gnsssdr library had its own CPU feature detection methods, which were not totally reliable and difficult to implement across compilers and OSes. This is now handled by Google's cpu_features library, thus building upon that expertise. The old detection methods are still preserved in machines with CMake 2.8.12.

CMakeLists.txt

@@ -329,7 +329,7 @@ set(GNSSSDR_GPSTK_LOCAL_VERSION "3.0.0")
 set(GNSSSDR_MATIO_LOCAL_VERSION "1.5.18")
 set(GNSSSDR_PUGIXML_LOCAL_VERSION "1.10")
 set(GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION "3.13.0")
-set(GNSSSDR_BENCHMARK_LOCAL_VERSION "1.5.1")
+set(GNSSSDR_BENCHMARK_LOCAL_VERSION "1.5.2")
 
 if(CMAKE_VERSION VERSION_LESS "3.0.2")
     set(GNSSSDR_GFLAGS_LOCAL_VERSION "2.2.1")  # Fix for CentOS 7
@@ -1117,6 +1117,7 @@ if(NOT VOLKGNSSSDR_FOUND)
             )
         endif()
     endif()
+    include(GNUInstallDirs)
     if(CMAKE_VERSION VERSION_LESS 3.2)
         ExternalProject_Add(volk_gnsssdr_module
             PREFIX ${CMAKE_BINARY_DIR}/volk_gnsssdr_module
@@ -1143,6 +1144,7 @@ if(NOT VOLKGNSSSDR_FOUND)
             BUILD_COMMAND ${VOLK_GNSSSDR_BUILD_COMMAND} volk_gnsssdr_profile
             BUILD_BYPRODUCTS ${CMAKE_BINARY_DIR}/volk_gnsssdr_module/install/lib/${CMAKE_FIND_LIBRARY_PREFIXES}volk_gnsssdr${CMAKE_STATIC_LIBRARY_SUFFIX}
                 ${CMAKE_BINARY_DIR}/volk_gnsssdr_module/install/bin/volk_gnsssdr_profile
+                ${CMAKE_BINARY_DIR}/volk_gnsssdr_module/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}cpu_features${CMAKE_STATIC_LIBRARY_SUFFIX}
             INSTALL_DIR ${CMAKE_BINARY_DIR}/volk_gnsssdr_module/install
         )
     endif()
@@ -1168,6 +1170,11 @@ if(NOT VOLKGNSSSDR_FOUND)
             INTERFACE_INCLUDE_DIRECTORIES "${VOLK_GNSSSDR_INCLUDE_DIRS}"
             INTERFACE_LINK_LIBRARIES "${VOLK_GNSSSDR_LIBRARIES}"
         )
+        if(CMAKE_VERSION VERSION_GREATER 3.0)
+            set_target_properties(Volkgnsssdr::volkgnsssdr PROPERTIES
+                INTERFACE_LINK_LIBRARIES ${CMAKE_BINARY_DIR}/volk_gnsssdr_module/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}cpu_features${CMAKE_STATIC_LIBRARY_SUFFIX}
+            )
+        endif()
     endif()
 
     if(CMAKE_VERSION VERSION_LESS 3.2)

LICENSES/Apache-2.0.txt

@@ -0,0 +1,208 @@
+Apache License
+
+Version 2.0, January 2004
+
+http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION,
+AND DISTRIBUTION
+
+   1. Definitions.
+
+      
+
+"License" shall mean the terms and conditions for use, reproduction, and distribution
+as defined by Sections 1 through 9 of this document.
+
+      
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright
+owner that is granting the License.
+
+      
+
+"Legal Entity" shall mean the union of the acting entity and all other entities
+that control, are controlled by, or are under common control with that entity.
+For the purposes of this definition, "control" means (i) the power, direct
+or indirect, to cause the direction or management of such entity, whether
+by contract or otherwise, or (ii) ownership of fifty percent (50%) or more
+of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+      
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising permissions
+granted by this License.
+
+      
+
+"Source" form shall mean the preferred form for making modifications, including
+but not limited to software source code, documentation source, and configuration
+files.
+
+      
+
+"Object" form shall mean any form resulting from mechanical transformation
+or translation of a Source form, including but not limited to compiled object
+code, generated documentation, and conversions to other media types.
+
+      
+
+"Work" shall mean the work of authorship, whether in Source or Object form,
+made available under the License, as indicated by a copyright notice that
+is included in or attached to the work (an example is provided in the Appendix
+below).
+
+      
+
+"Derivative Works" shall mean any work, whether in Source or Object form,
+that is based on (or derived from) the Work and for which the editorial revisions,
+annotations, elaborations, or other modifications represent, as a whole, an
+original work of authorship. For the purposes of this License, Derivative
+Works shall not include works that remain separable from, or merely link (or
+bind by name) to the interfaces of, the Work and Derivative Works thereof.
+
+      
+
+"Contribution" shall mean any work of authorship, including the original version
+of the Work and any modifications or additions to that Work or Derivative
+Works thereof, that is intentionally submitted to Licensor for inclusion in
+the Work by the copyright owner or by an individual or Legal Entity authorized
+to submit on behalf of the copyright owner. For the purposes of this definition,
+"submitted" means any form of electronic, verbal, or written communication
+sent to the Licensor or its representatives, including but not limited to
+communication on electronic mailing lists, source code control systems, and
+issue tracking systems that are managed by, or on behalf of, the Licensor
+for the purpose of discussing and improving the Work, but excluding communication
+that is conspicuously marked or otherwise designated in writing by the copyright
+owner as "Not a Contribution."
+
+      
+
+"Contributor" shall mean Licensor and any individual or Legal Entity on behalf
+of whom a Contribution has been received by Licensor and subsequently incorporated
+within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of this
+License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable copyright license to reproduce, prepare
+Derivative Works of, publicly display, publicly perform, sublicense, and distribute
+the Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of this License,
+each Contributor hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section) patent
+license to make, have made, use, offer to sell, sell, import, and otherwise
+transfer the Work, where such license applies only to those patent claims
+licensable by such Contributor that are necessarily infringed by their Contribution(s)
+alone or by combination of their Contribution(s) with the Work to which such
+Contribution(s) was submitted. If You institute patent litigation against
+any entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that the Work or a Contribution incorporated within the Work constitutes direct
+or contributory patent infringement, then any patent licenses granted to You
+under this License for that Work shall terminate as of the date such litigation
+is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the Work or
+Derivative Works thereof in any medium, with or without modifications, and
+in Source or Object form, provided that You meet the following conditions:
+
+(a) You must give any other recipients of the Work or Derivative Works a copy
+of this License; and
+
+(b) You must cause any modified files to carry prominent notices stating that
+You changed the files; and
+
+(c) You must retain, in the Source form of any Derivative Works that You distribute,
+all copyright, patent, trademark, and attribution notices from the Source
+form of the Work, excluding those notices that do not pertain to any part
+of the Derivative Works; and
+
+(d) If the Work includes a "NOTICE" text file as part of its distribution,
+then any Derivative Works that You distribute must include a readable copy
+of the attribution notices contained within such NOTICE file, excluding those
+notices that do not pertain to any part of the Derivative Works, in at least
+one of the following places: within a NOTICE text file distributed as part
+of the Derivative Works; within the Source form or documentation, if provided
+along with the Derivative Works; or, within a display generated by the Derivative
+Works, if and wherever such third-party notices normally appear. The contents
+of the NOTICE file are for informational purposes only and do not modify the
+License. You may add Your own attribution notices within Derivative Works
+that You distribute, alongside or as an addendum to the NOTICE text from the
+Work, provided that such additional attribution notices cannot be construed
+as modifying the License.
+
+You may add Your own copyright statement to Your modifications and may provide
+additional or different license terms and conditions for use, reproduction,
+or distribution of Your modifications, or for any such Derivative Works as
+a whole, provided Your use, reproduction, and distribution of the Work otherwise
+complies with the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise, any
+Contribution intentionally submitted for inclusion in the Work by You to the
+Licensor shall be under the terms and conditions of this License, without
+any additional terms or conditions. Notwithstanding the above, nothing herein
+shall supersede or modify the terms of any separate license agreement you
+may have executed with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade names,
+trademarks, service marks, or product names of the Licensor, except as required
+for reasonable and customary use in describing the origin of the Work and
+reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or agreed to
+in writing, Licensor provides the Work (and each Contributor provides its
+Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied, including, without limitation, any warranties
+or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR
+A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness
+of using or redistributing the Work and assume any risks associated with Your
+exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory, whether
+in tort (including negligence), contract, or otherwise, unless required by
+applicable law (such as deliberate and grossly negligent acts) or agreed to
+in writing, shall any Contributor be liable to You for damages, including
+any direct, indirect, special, incidental, or consequential damages of any
+character arising as a result of this License or out of the use or inability
+to use the Work (including but not limited to damages for loss of goodwill,
+work stoppage, computer failure or malfunction, or any and all other commercial
+damages or losses), even if such Contributor has been advised of the possibility
+of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing the Work
+or Derivative Works thereof, You may choose to offer, and charge a fee for,
+acceptance of support, warranty, indemnity, or other liability obligations
+and/or rights consistent with this License. However, in accepting such obligations,
+You may act only on Your own behalf and on Your sole responsibility, not on
+behalf of any other Contributor, and only if You agree to indemnify, defend,
+and hold each Contributor harmless for any liability incurred by, or claims
+asserted against, such Contributor by reason of your accepting any such warranty
+or additional liability. END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+To apply the Apache License to your work, attach the following boilerplate
+notice, with the fields enclosed by brackets "[]" replaced with your own identifying
+information. (Don't include the brackets!) The text should be enclosed in
+the appropriate comment syntax for the file format. We also recommend that
+a file or class name and description of purpose be included on the same "printed
+page" as the copyright notice for easier identification within third-party
+archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+
+you may not use this file except in compliance with the License.
+
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+
+distributed under the License is distributed on an "AS IS" BASIS,
+
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+
+See the License for the specific language governing permissions and
+
+limitations under the License.

docs/changelog.md

@@ -31,6 +31,15 @@ SPDX-FileCopyrightText: 2011-2020 Carles Fernandez-Prades <carles.fernandez@cttc
 - Replaced `git://` by `https://` as the used protocol when downloading Gflags,
   so it can work through firewalls requiring authentication.
 - Fixed static linking of the matio library when downloaded and built by CMake.
+- Improved CPU feature detection by switching to Google's
+  [cpu_features](https://github.com/google/cpu_features) library: The
+  `volk_gnsssdr` library had its own CPU feature detection methods, which were
+  not totally reliable and difficult to implement across compilers and OSes.
+  This is now handled by the `cpu_features` library, thus building upon that
+  expertise. Since that library has higher dependency version requirements than
+  GNSS-SDR, the old method is still used in old development environments. No
+  extra dependency is needed. This change is transparent to the user, since
+  everything is managed by the CMake scripts.
 - Fix building with `-DENABLE_CUDA=ON` for blocks implemented with CUDA.
 
 ### Improvements in Usability:

src/algorithms/libs/geofunctions.cc

@@ -27,15 +27,9 @@ const double STRP_PI = 3.1415926535898;  // Pi as defined in IS-GPS-200K
 
 arma::mat Skew_symmetric(const arma::vec &a)
 {
-    arma::mat A = arma::zeros(3, 3);
-
-    A << 0.0 << -a(2) << a(1) << arma::endr
-      << a(2) << 0.0 << -a(0) << arma::endr
-      << -a(1) << a(0) << 0 << arma::endr;
-
-    //    {{0,    -a(2),  a(1)},
-    //     {a(2),     0, -a(0)},
-    //     {-a(1), a(0),     0}};
+    arma::mat A = {{0.0, -a(2), a(1)},
+        {a(2), 0.0, -a(0)},
+        {-a(1), a(0), 0.0}};
     return A;
 }
 
@@ -383,14 +377,11 @@ void ECEF_to_Geo(const arma::vec &r_eb_e, const arma::vec &v_eb_e, const arma::m
     double sin_lat = sin(LLH(0));
     double cos_long = cos(LLH(1));
     double sin_long = sin(LLH(1));
-    // C++11 and arma >= 5.2
-    //    arma::mat C_e_n = {{-sin_lat * cos_long, -sin_lat * sin_long,  cos_lat},
-    //                      {-sin_long, cos_long, 0},
-    //                      {-cos_lat * cos_long, -cos_lat * sin_long, -sin_lat}}; //ECEF to Geo
-    arma::mat C_e_n = arma::zeros(3, 3);
-    C_e_n << -sin_lat * cos_long << -sin_lat * sin_long << cos_lat << arma::endr
-          << -sin_long << cos_long << 0 << arma::endr
-          << -cos_lat * cos_long << -cos_lat * sin_long << -sin_lat << arma::endr;  // ECEF to Geo
+
+    arma::mat C_e_n = {{-sin_lat * cos_long, -sin_lat * sin_long, cos_lat},
+        {-sin_long, cos_long, 0},
+        {-cos_lat * cos_long, -cos_lat * sin_long, -sin_lat}};  // ECEF to Geo
+
     // Transform velocity using (2.73)
     v_eb_n = C_e_n * v_eb_e;
 
@@ -417,14 +408,9 @@ void Geo_to_ECEF(const arma::vec &LLH, const arma::vec &v_eb_n, const arma::mat
         ((1 - e * e) * R_E + LLH(2)) * sin_lat};
 
     // Calculate ECEF to Geo coordinate transformation matrix using (2.150)
-    // C++11 and arma>=5.2
-    //    arma::mat C_e_n = {{-sin_lat * cos_long, -sin_lat * sin_long,  cos_lat},
-    //                       {-sin_long,            cos_long,        0},
-    //                       {-cos_lat * cos_long, -cos_lat * sin_long, -sin_lat}};
-    arma::mat C_e_n = arma::zeros(3, 3);
-    C_e_n << -sin_lat * cos_long << -sin_lat * sin_long << cos_lat << arma::endr
-          << -sin_long << cos_long << 0 << arma::endr
-          << -cos_lat * cos_long << -cos_lat * sin_long << -sin_lat << arma::endr;
+    arma::mat C_e_n = {{-sin_lat * cos_long, -sin_lat * sin_long, cos_lat},
+        {-sin_long, cos_long, 0},
+        {-cos_lat * cos_long, -cos_lat * sin_long, -sin_lat}};
 
     // Transform velocity using (2.73)
     v_eb_e = C_e_n.t() * v_eb_n;
@@ -453,10 +439,9 @@ void pv_Geo_to_ECEF(double L_b, double lambda_b, double h_b, const arma::vec &v_
         ((1 - pow(e, 2)) * R_E + h_b) * sin_lat};
 
     // Calculate ECEF to Geo coordinate transformation matrix using (2.150)
-    arma::mat C_e_n = arma::zeros(3, 3);
-    C_e_n << -sin_lat * cos_long << -sin_lat * sin_long << cos_lat << arma::endr
-          << -sin_long << cos_long << 0 << arma::endr
-          << -cos_lat * cos_long << -cos_lat * sin_long << -sin_lat << arma::endr;
+    arma::mat C_e_n = {{-sin_lat * cos_long, -sin_lat * sin_long, cos_lat},
+        {-sin_long, cos_long, 0.0},
+        {-cos_lat * cos_long, -cos_lat * sin_long, -sin_lat}};
 
     // Transform velocity using (2.73)
     v_eb_e = C_e_n.t() * v_eb_n;

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/.gitignore

@@ -8,3 +8,4 @@ build/
 .project
 .cproject
 /.DS_Store
+/gen/volk_gnsssdr_arch_defs.py

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/CMakeLists.txt

@@ -227,6 +227,16 @@ endif()
 # Dependencies setup
 ########################################################################
 
+# cpu_features
+if(CMAKE_VERSION VERSION_GREATER 3.0)
+    set(BUILD_PIC ON CACHE BOOL
+        "Build cpu_features with Position Independent Code (PIC)."
+        FORCE
+    )
+    set(USE_CPU_FEATURES ON)
+    add_subdirectory(cpu_features)
+endif()
+
 # Python
 include(VolkPython) # sets PYTHON_EXECUTABLE
 volk_python_check_module("python >= 2.7" sys "sys.version.split()[0] >= '2.7'" PYTHON_MIN_VER_FOUND)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/apps/CMakeLists.txt

@@ -53,7 +53,7 @@ target_include_directories(volk_gnsssdr_profile
     PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
 )
 
-if(NOT ${FILESYSTEM_FOUND})
+if(NOT FILESYSTEM_FOUND)
     target_include_directories(volk_gnsssdr_profile
         PUBLIC ${Boost_INCLUDE_DIRS}
     )
@@ -61,7 +61,7 @@ if(NOT ${FILESYSTEM_FOUND})
 endif()
 
 
-if(${FILESYSTEM_FOUND})
+if(FILESYSTEM_FOUND)
     add_definitions(-DHAS_STD_FILESYSTEM=1)
     if(${find_experimental})
         add_definitions(-DHAS_STD_FILESYSTEM_EXPERIMENTAL=1)
@@ -70,9 +70,9 @@ if(${FILESYSTEM_FOUND})
 endif()
 
 if(ENABLE_STATIC_LIBS)
-    target_link_libraries(volk_gnsssdr_profile PUBLIC volk_gnsssdr_static ${orc_lib})
+    target_link_libraries(volk_gnsssdr_profile PRIVATE volk_gnsssdr_static ${orc_lib})
 else()
-    target_link_libraries(volk_gnsssdr_profile PUBLIC volk_gnsssdr ${orc_lib})
+    target_link_libraries(volk_gnsssdr_profile PRIVATE volk_gnsssdr ${orc_lib})
     add_dependencies(volk_gnsssdr_profile volk_gnsssdr)
 endif()
 

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cmake/Toolchains/aarch64-linux-gnu.cmake

@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 set(CMAKE_SYSTEM_NAME Linux)
-set(CMAKE_SYSTEM_PROCESSOR ARM)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
 
 if(MINGW OR CYGWIN OR WIN32)
     set(UTIL_SEARCH_CMD where)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cmake/Toolchains/arm-linux-gnueabihf.cmake

@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 set(CMAKE_SYSTEM_NAME Linux)
-set(CMAKE_SYSTEM_PROCESSOR ARM)
+set(CMAKE_SYSTEM_PROCESSOR arm)
 
 if(MINGW OR CYGWIN OR WIN32)
     set(UTIL_SEARCH_CMD where)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/CMakeLists.txt

@@ -0,0 +1,265 @@
+# SPDX-FileCopyrightText: 2017 Google Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.0)
+
+# option() honors normal variables.
+# see: https://cmake.org/cmake/help/git-stage/policy/CMP0077.html
+if(POLICY CMP0077)
+  cmake_policy(SET CMP0077 NEW)
+endif()
+
+project(CpuFeatures VERSION 0.6.0 LANGUAGES C)
+
+set(CMAKE_C_STANDARD 99)
+if(CMAKE_VERSION LESS "3.1")
+    add_compile_options("$<$<STREQUAL:$<TARGET_PROPERTY:LINKER_LANGUAGE>,C>:-std=gnu99>")
+endif()
+
+# Default Build Type to be Release
+if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE "Release" CACHE STRING
+      "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
+      FORCE)
+endif()
+
+# BUILD_TESTING is a standard CMake variable, but we declare it here to make it
+# prominent in the GUI.
+option(BUILD_TESTING "Enable test (depends on googletest)." OFF)
+# BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make
+# it prominent in the GUI.
+# cpu_features uses bit-fields which are - to some extends - implementation-defined (see https://en.cppreference.com/w/c/language/bit_field).
+# As a consequence it is discouraged to use cpu_features as a shared library because different compilers may interpret the code in different ways.
+# Prefer static linking from source whenever possible.
+option(BUILD_SHARED_LIBS "Build library as shared." OFF)
+# PIC
+option(BUILD_PIC "Build with Position Independant Code." OFF) # Default is off at least for GCC
+
+# Force PIC on unix when building shared libs
+# see: https://en.wikipedia.org/wiki/Position-independent_code
+if(BUILD_SHARED_LIBS AND UNIX)
+  set(BUILD_PIC ON)
+endif()
+
+include(CheckIncludeFile)
+include(CheckSymbolExists)
+include(GNUInstallDirs)
+
+macro(setup_include_and_definitions TARGET_NAME)
+  target_include_directories(${TARGET_NAME}
+    PUBLIC  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+    PRIVATE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include/internal>
+  )
+  target_compile_definitions(${TARGET_NAME}
+    PUBLIC STACK_LINE_READER_BUFFER_SIZE=1024
+  )
+endmacro()
+
+set(PROCESSOR_IS_MIPS FALSE)
+set(PROCESSOR_IS_ARM FALSE)
+set(PROCESSOR_IS_AARCH64 FALSE)
+set(PROCESSOR_IS_X86 FALSE)
+set(PROCESSOR_IS_POWER FALSE)
+
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
+  set(PROCESSOR_IS_MIPS TRUE)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
+  set(PROCESSOR_IS_ARM TRUE)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
+  set(PROCESSOR_IS_AARCH64 TRUE)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(AMD64|amd64)|(^i.86$)")
+  set(PROCESSOR_IS_X86 TRUE)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)")
+  set(PROCESSOR_IS_POWER TRUE)
+endif()
+
+macro(add_cpu_features_headers_and_sources HDRS_LIST_NAME SRCS_LIST_NAME)
+  list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpu_features_macros.h)
+  list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpu_features_cache_info.h)
+  if(PROCESSOR_IS_MIPS)
+      list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpuinfo_mips.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/src/cpuinfo_mips.c)
+  elseif(PROCESSOR_IS_ARM)
+      list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpuinfo_arm.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/src/cpuinfo_arm.c)
+  elseif(PROCESSOR_IS_AARCH64)
+      list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpuinfo_aarch64.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/src/cpuinfo_aarch64.c)
+  elseif(PROCESSOR_IS_X86)
+      list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpuinfo_x86.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/internal/cpuid_x86.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/src/cpuinfo_x86.c)
+  elseif(PROCESSOR_IS_POWER)
+      list(APPEND ${HDRS_LIST_NAME} ${PROJECT_SOURCE_DIR}/include/cpuinfo_ppc.h)
+      list(APPEND ${SRCS_LIST_NAME} ${PROJECT_SOURCE_DIR}/src/cpuinfo_ppc.c)
+  else()
+    message(FATAL_ERROR "Unsupported architectures ${CMAKE_SYSTEM_PROCESSOR}")
+  endif()
+endmacro()
+
+#
+# library : utils
+#
+
+add_library(utils OBJECT
+  ${PROJECT_SOURCE_DIR}/include/internal/bit_utils.h
+  ${PROJECT_SOURCE_DIR}/include/internal/filesystem.h
+  ${PROJECT_SOURCE_DIR}/include/internal/stack_line_reader.h
+  ${PROJECT_SOURCE_DIR}/include/internal/string_view.h
+  ${PROJECT_SOURCE_DIR}/src/filesystem.c
+  ${PROJECT_SOURCE_DIR}/src/stack_line_reader.c
+  ${PROJECT_SOURCE_DIR}/src/string_view.c
+)
+set_property(TARGET utils PROPERTY POSITION_INDEPENDENT_CODE ${BUILD_PIC})
+setup_include_and_definitions(utils)
+
+#
+# library : unix_based_hardware_detection
+#
+
+if(UNIX)
+  add_library(unix_based_hardware_detection OBJECT
+    ${PROJECT_SOURCE_DIR}/include/internal/hwcaps.h
+    ${PROJECT_SOURCE_DIR}/src/hwcaps.c
+  )
+  setup_include_and_definitions(unix_based_hardware_detection)
+  check_include_file(dlfcn.h HAVE_DLFCN_H)
+  if(HAVE_DLFCN_H)
+    target_compile_definitions(unix_based_hardware_detection PRIVATE HAVE_DLFCN_H)
+  endif()
+  check_symbol_exists(getauxval "sys/auxv.h" HAVE_STRONG_GETAUXVAL)
+  if(HAVE_STRONG_GETAUXVAL)
+    target_compile_definitions(unix_based_hardware_detection PRIVATE HAVE_STRONG_GETAUXVAL)
+  endif()
+  set_property(TARGET unix_based_hardware_detection PROPERTY POSITION_INDEPENDENT_CODE ${BUILD_PIC})
+endif()
+
+#
+# library : cpu_features
+#
+set(CPU_FEATURES_HDRS)
+set(CPU_FEATURES_SRCS)
+add_cpu_features_headers_and_sources(CPU_FEATURES_HDRS CPU_FEATURES_SRCS)
+list(APPEND CPU_FEATURES_SRCS $<TARGET_OBJECTS:utils>)
+if(NOT PROCESSOR_IS_X86 AND UNIX)
+  list(APPEND CPU_FEATURES_SRCS $<TARGET_OBJECTS:unix_based_hardware_detection>)
+endif()
+add_library(cpu_features ${CPU_FEATURES_HDRS} ${CPU_FEATURES_SRCS})
+set_target_properties(cpu_features PROPERTIES PUBLIC_HEADER "${CPU_FEATURES_HDRS}")
+setup_include_and_definitions(cpu_features)
+target_link_libraries(cpu_features PUBLIC ${CMAKE_DL_LIBS})
+set_property(TARGET cpu_features PROPERTY POSITION_INDEPENDENT_CODE ${BUILD_PIC})
+target_include_directories(cpu_features
+  PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/cpu_features>
+)
+if(PROCESSOR_IS_X86)
+  if(APPLE)
+    target_compile_definitions(cpu_features PRIVATE HAVE_SYSCTLBYNAME)
+  endif()
+endif()
+add_library(CpuFeature::cpu_features ALIAS cpu_features)
+
+#
+# program : list_cpu_features
+#
+
+add_executable(list_cpu_features ${PROJECT_SOURCE_DIR}/src/utils/list_cpu_features.c)
+target_link_libraries(list_cpu_features PRIVATE cpu_features)
+add_executable(CpuFeature::list_cpu_features ALIAS list_cpu_features)
+
+#
+# ndk_compat
+#
+
+if(ANDROID)
+add_subdirectory(ndk_compat)
+endif()
+
+#
+# tests
+#
+
+include(CTest)
+if(BUILD_TESTING)
+  # Automatically incorporate googletest into the CMake Project if target not
+  # found.
+  enable_language(CXX)
+
+  set(CMAKE_CXX_STANDARD 11)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+  set(CMAKE_CXX_EXTENSIONS OFF) # prefer use of -std11 instead of -gnustd11
+
+  if(NOT TARGET gtest OR NOT TARGET gmock_main)
+    # Download and unpack googletest at configure time.
+    configure_file(
+      cmake/googletest.CMakeLists.txt.in
+      googletest-download/CMakeLists.txt
+    )
+
+    execute_process(
+      COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+      RESULT_VARIABLE result
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)
+
+    if(result)
+      message(FATAL_ERROR "CMake step for googletest failed: ${result}")
+    endif()
+
+    execute_process(
+      COMMAND ${CMAKE_COMMAND} --build .
+      RESULT_VARIABLE result
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)
+
+    if(result)
+      message(FATAL_ERROR "Build step for googletest failed: ${result}")
+    endif()
+
+    # Prevent overriding the parent project's compiler/linker settings on
+    # Windows.
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+    # Add googletest directly to our build. This defines the gtest and
+    # gtest_main targets.
+    add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
+        ${CMAKE_BINARY_DIR}/googletest-build
+        EXCLUDE_FROM_ALL)
+  endif()
+
+  add_subdirectory(test)
+endif()
+
+#
+# Install cpu_features and list_cpu_features
+#
+
+include(GNUInstallDirs)
+install(TARGETS cpu_features list_cpu_features
+  EXPORT CpuFeaturesTargets
+  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/cpu_features
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+install(EXPORT CpuFeaturesTargets
+  NAMESPACE CpuFeatures::
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures
+  COMPONENT Devel
+)
+include(CMakePackageConfigHelpers)
+configure_package_config_file(cmake/CpuFeaturesConfig.cmake.in
+  "${PROJECT_BINARY_DIR}/CpuFeaturesConfig.cmake"
+  INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures"
+  NO_SET_AND_CHECK_MACRO
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO
+)
+write_basic_package_version_file(
+  "${PROJECT_BINARY_DIR}/CpuFeaturesConfigVersion.cmake"
+  COMPATIBILITY SameMajorVersion
+)
+install(
+  FILES
+    "${PROJECT_BINARY_DIR}/CpuFeaturesConfig.cmake"
+    "${PROJECT_BINARY_DIR}/CpuFeaturesConfigVersion.cmake"
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures"
+  COMPONENT Devel
+)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/README.md

@@ -0,0 +1,222 @@
+# cpu_features
+
+<!-- prettier-ignore-start -->
+[comment]: # (
+SPDX-License-Identifier: Apache-2.0
+)
+
+[comment]: # (
+SPDX-FileCopyrightText: 2017 Google LLC
+)
+<!-- prettier-ignore-end -->
+
+A cross-platform C library to retrieve CPU features (such as available
+instructions) at runtime.
+
+## Table of Contents
+
+- [Design Rationale](#rationale)
+- [Code samples](#codesample)
+- [Running sample code](#usagesample)
+- [What's supported](#support)
+- [Android NDK's drop in replacement](#ndk)
+- [License](#license)
+- [Build with cmake](#cmake)
+
+<a name="rationale"></a>
+
+## Design Rationale
+
+- **Simple to use.** See the snippets below for examples.
+- **Extensible.** Easy to add missing features or architectures.
+- **Compatible with old compilers** and available on many architectures so it
+  can be used widely. To ensure that cpu_features works on as many platforms as
+  possible, we implemented it in a highly portable version of C: C99.
+- **Sandbox-compatible.** The library uses a variety of strategies to cope with
+  sandboxed environments or when `cpuid` is unavailable. This is useful when
+  running integration tests in hermetic environments.
+- **Thread safe, no memory allocation, and raises no exceptions.** cpu_features
+  is suitable for implementing fundamental libc functions like `malloc`,
+  `memcpy`, and `memcmp`.
+- **Unit tested.**
+
+<a name="codesample"></a>
+
+## Code samples
+
+**Note:** For C++ code, the library functions are defined in the `CpuFeatures`
+namespace.
+
+### Checking features at runtime
+
+Here's a simple example that executes a codepath if the CPU supports both the
+AES and the SSE4.2 instruction sets:
+
+```c
+#include "cpuinfo_x86.h"
+
+// For C++, add `using namespace CpuFeatures;`
+static const X86Features features = GetX86Info().features;
+
+void Compute(void) {
+  if (features.aes && features.sse4_2) {
+    // Run optimized code.
+  } else {
+    // Run standard code.
+  }
+}
+```
+
+### Caching for faster evaluation of complex checks
+
+If you wish, you can read all the features at once into a global variable, and
+then query for the specific features you care about. Below, we store all the ARM
+features and then check whether AES and NEON are supported.
+
+```c
+#include <stdbool.h>
+#include "cpuinfo_arm.h"
+
+// For C++, add `using namespace CpuFeatures;`
+static const ArmFeatures features = GetArmInfo().features;
+static const bool has_aes_and_neon = features.aes && features.neon;
+
+// use has_aes_and_neon.
+```
+
+This is a good approach to take if you're checking for combinations of features
+when using a compiler that is slow to extract individual bits from bit-packed
+structures.
+
+### Checking compile time flags
+
+The following code determines whether the compiler was told to use the AVX
+instruction set (e.g., `g++ -mavx`) and sets `has_avx` accordingly.
+
+```c
+#include <stdbool.h>
+#include "cpuinfo_x86.h"
+
+// For C++, add `using namespace CpuFeatures;`
+static const X86Features features = GetX86Info().features;
+static const bool has_avx = CPU_FEATURES_COMPILED_X86_AVX || features.avx;
+
+// use has_avx.
+```
+
+`CPU_FEATURES_COMPILED_X86_AVX` is set to 1 if the compiler was instructed to
+use AVX and 0 otherwise, combining compile time and runtime knowledge.
+
+### Rejecting poor hardware implementations based on microarchitecture
+
+On x86, the first incarnation of a feature in a microarchitecture might not be
+the most efficient (e.g. AVX on Sandy Bridge). We provide a function to retrieve
+the underlying microarchitecture so you can decide whether to use it.
+
+Below, `has_fast_avx` is set to 1 if the CPU supports the AVX instruction
+set&mdash;but only if it's not Sandy Bridge.
+
+```c
+#include <stdbool.h>
+#include "cpuinfo_x86.h"
+
+// For C++, add `using namespace CpuFeatures;`
+static const X86Info info = GetX86Info();
+static const X86Microarchitecture uarch = GetX86Microarchitecture(&info);
+static const bool has_fast_avx = info.features.avx && uarch != INTEL_SNB;
+
+// use has_fast_avx.
+```
+
+This feature is currently available only for x86 microarchitectures.
+
+<a name="usagesample"></a>
+
+### Running sample code
+
+Building `cpu_features` (check [quickstart](#quickstart) below) brings a small
+executable to test the library.
+
+```shell
+ % ./build/list_cpu_features
+arch            : x86
+brand           :        Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz
+family          :   6 (0x06)
+model           :  45 (0x2D)
+stepping        :   7 (0x07)
+uarch           : INTEL_SNB
+flags           : aes,avx,cx16,smx,sse4_1,sse4_2,ssse3
+```
+
+```shell
+% ./build/list_cpu_features --json
+{"arch":"x86","brand":"       Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz","family":6,"model":45,"stepping":7,"uarch":"INTEL_SNB","flags":["aes","avx","cx16","smx","sse4_1","sse4_2","ssse3"]}
+```
+
+<a name="support"></a>
+
+## What's supported
+
+|         | x86³ |   ARM   | AArch64 | MIPS⁴ | POWER |
+| ------- | :--: | :-----: | :-----: | :---: | :---: |
+| Android | yes² |  yes¹   |  yes¹   | yes¹  |  N/A  |
+| iOS     | N/A  | not yet | not yet |  N/A  |  N/A  |
+| Linux   | yes² |  yes¹   |  yes¹   | yes¹  | yes¹  |
+| MacOs   | yes² |   N/A   | not yet |  N/A  |  no   |
+| Windows | yes² | not yet | not yet |  N/A  |  N/A  |
+
+1.  **Features revealed from Linux.** We gather data from several sources
+    depending on availability:
+    - from glibc's
+      [getauxval](https://www.gnu.org/software/libc/manual/html_node/Auxiliary-Vector.html)
+    - by parsing `/proc/self/auxv`
+    - by parsing `/proc/cpuinfo`
+2.  **Features revealed from CPU.** features are retrieved by using the `cpuid`
+    instruction.
+3.  **Microarchitecture detection.** On x86 some features are not always
+    implemented efficiently in hardware (e.g. AVX on Sandybridge). Exposing the
+    microarchitecture allows the client to reject particular microarchitectures.
+4.  All flavors of Mips are supported, little and big endian as well as 32/64
+    bits.
+
+<a name="ndk"></a>
+
+## Android NDK's drop in replacement
+
+[cpu_features](https://github.com/google/cpu_features) is now officially
+supporting Android and offers a drop in replacement of for the NDK's
+[cpu-features.h](https://android.googlesource.com/platform/ndk/+/master/sources/android/cpufeatures/cpu-features.h)
+, see [ndk_compat](ndk_compat) folder for details.
+
+<a name="license"></a>
+
+## License
+
+The cpu_features library is licensed under the terms of the Apache license. See
+[LICENSE](LICENSE) for more information.
+
+<a name="cmake"></a>
+
+## Build with CMake
+
+Please check the [CMake build instructions](cmake/README.md).
+
+<a name="quickstart"></a>
+
+### Quickstart with `Ninja`
+
+- build `list_cpu_features`
+
+```
+    cmake -B/tmp/cpu_features -H. -GNinja -DCMAKE_BUILD_TYPE=Release
+    ninja -C/tmp/cpu_features
+    /tmp/cpu_features/list_cpu_features --json
+```
+
+- run tests
+
+```
+    cmake -B/tmp/cpu_features -H. -GNinja -DBUILD_TESTING=ON
+    ninja -C/tmp/cpu_features
+    ninja -C/tmp/cpu_features test
+```

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/cmake/CpuFeaturesConfig.cmake.in

@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+# CpuFeatures CMake configuration file
+
+include("${CMAKE_CURRENT_LIST_DIR}/CpuFeaturesTargets.cmake")

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/cmake/CpuFeaturesNdkCompatConfig.cmake.in

@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+# CpuFeaturesNdkCompat CMake configuration file
+
+include("${CMAKE_CURRENT_LIST_DIR}/CpuFeaturesNdkCompatTargets.cmake")

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/cmake/README.md

@@ -0,0 +1,37 @@
+# CMake build instructions
+
+<!-- prettier-ignore-start -->
+[comment]: # (
+SPDX-License-Identifier: Apache-2.0
+)
+
+[comment]: # (
+SPDX-FileCopyrightText: 2017 Google LLC
+)
+<!-- prettier-ignore-end -->
+
+## Recommended usage : Incorporating cpu_features into a CMake project
+
+For API / ABI compatibility reasons, it is recommended to build and use
+cpu_features in a subdirectory of your project or as an embedded dependency.
+
+This is similar to the recommended usage of the googletest framework (
+https://github.com/google/googletest/blob/master/googletest/README.md )
+
+Build and use step-by-step
+
+1- Download cpu_features and copy it in a sub-directory in your project. or add
+cpu_features as a git-submodule in your project
+
+2- You can then use the cmake command `add_subdirectory()` to include
+cpu_features directly and use the `cpu_features` target in your project.
+
+3- Add the `cpu_features` target to the `target_link_libraries()` section of
+your executable or of your library.
+
+## Enabling tests
+
+CMake default options for cpu_features is Release built type with tests
+disabled. To enable testing set cmake `BUILD_TESTING` variable to `ON`,
+[.travis.yml](../.travis.yml) and [appveyor.yml](../appveyor.yml) have up to
+date examples.

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/cmake/googletest.CMakeLists.txt.in

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 2.8.2)
+
+project(googletest-download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(googletest
+  GIT_REPOSITORY    https://github.com/google/googletest.git
+  GIT_TAG           master
+  SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
+  BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND     ""
+  INSTALL_COMMAND   ""
+  TEST_COMMAND      ""
+)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpu_features_cache_info.h

@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_COMMON_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_COMMON_H_
+
+#include "cpu_features_macros.h"
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef enum
+{
+    CPU_FEATURE_CACHE_NULL = 0,
+    CPU_FEATURE_CACHE_DATA = 1,
+    CPU_FEATURE_CACHE_INSTRUCTION = 2,
+    CPU_FEATURE_CACHE_UNIFIED = 3,
+    CPU_FEATURE_CACHE_TLB = 4,
+    CPU_FEATURE_CACHE_DTLB = 5,
+    CPU_FEATURE_CACHE_STLB = 6,
+    CPU_FEATURE_CACHE_PREFETCH = 7
+} CacheType;
+
+typedef struct
+{
+    int level;
+    CacheType cache_type;
+    int cache_size;    // Cache size in bytes
+    int ways;          // Associativity, 0 undefined, 0xFF fully associative
+    int line_size;     // Cache line size in bytes
+    int tlb_entries;   // number of entries for TLB
+    int partitioning;  // number of lines per sector
+} CacheLevelInfo;
+
+// Increase this value if more cache levels are needed.
+#ifndef CPU_FEATURES_MAX_CACHE_LEVEL
+#define CPU_FEATURES_MAX_CACHE_LEVEL 10
+#endif
+typedef struct
+{
+    int size;
+    CacheLevelInfo levels[CPU_FEATURES_MAX_CACHE_LEVEL];
+} CacheInfo;
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_COMMON_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpu_features_macros.h

@@ -0,0 +1,208 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
+#define CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_
+
+////////////////////////////////////////////////////////////////////////////////
+// Architectures
+////////////////////////////////////////////////////////////////////////////////
+
+#if defined(__pnacl__) || defined(__CLR_VER)
+#define CPU_FEATURES_ARCH_VM
+#endif
+
+#if (defined(_M_IX86) || defined(__i386__)) && !defined(CPU_FEATURES_ARCH_VM)
+#define CPU_FEATURES_ARCH_X86_32
+#endif
+
+#if (defined(_M_X64) || defined(__x86_64__)) && !defined(CPU_FEATURES_ARCH_VM)
+#define CPU_FEATURES_ARCH_X86_64
+#endif
+
+#if defined(CPU_FEATURES_ARCH_X86_32) || defined(CPU_FEATURES_ARCH_X86_64)
+#define CPU_FEATURES_ARCH_X86
+#endif
+
+#if (defined(__arm__) || defined(_M_ARM))
+#define CPU_FEATURES_ARCH_ARM
+#endif
+
+#if defined(__aarch64__)
+#define CPU_FEATURES_ARCH_AARCH64
+#endif
+
+#if (defined(CPU_FEATURES_ARCH_AARCH64) || defined(CPU_FEATURES_ARCH_ARM))
+#define CPU_FEATURES_ARCH_ANY_ARM
+#endif
+
+#if defined(__mips64)
+#define CPU_FEATURES_ARCH_MIPS64
+#endif
+
+#if defined(__mips__) && !defined(__mips64)  // mips64 also declares __mips__
+#define CPU_FEATURES_ARCH_MIPS32
+#endif
+
+#if defined(CPU_FEATURES_ARCH_MIPS32) || defined(CPU_FEATURES_ARCH_MIPS64)
+#define CPU_FEATURES_ARCH_MIPS
+#endif
+
+#if defined(__powerpc__)
+#define CPU_FEATURES_ARCH_PPC
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Os
+////////////////////////////////////////////////////////////////////////////////
+
+#if defined(__linux__)
+#define CPU_FEATURES_OS_LINUX_OR_ANDROID
+#endif
+
+#if defined(__ANDROID__)
+#define CPU_FEATURES_OS_ANDROID
+#endif
+
+#if (defined(_WIN64) || defined(_WIN32))
+#define CPU_FEATURES_OS_WINDOWS
+#endif
+
+#if (defined(__apple__) || defined(__APPLE__) || defined(__MACH__))
+#define CPU_FEATURES_OS_DARWIN
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Compilers
+////////////////////////////////////////////////////////////////////////////////
+
+#if defined(__clang__)
+#define CPU_FEATURES_COMPILER_CLANG
+#endif
+
+#if defined(__GNUC__) && !defined(__clang__)
+#define CPU_FEATURES_COMPILER_GCC
+#endif
+
+#if defined(_MSC_VER)
+#define CPU_FEATURES_COMPILER_MSC
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Cpp
+////////////////////////////////////////////////////////////////////////////////
+
+#if defined(__cplusplus)
+#define CPU_FEATURES_START_CPP_NAMESPACE \
+    namespace cpu_features               \
+    {                                    \
+    extern "C"                           \
+    {
+#define CPU_FEATURES_END_CPP_NAMESPACE \
+    }                                  \
+    }
+#else
+#define CPU_FEATURES_START_CPP_NAMESPACE
+#define CPU_FEATURES_END_CPP_NAMESPACE
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Compiler flags
+////////////////////////////////////////////////////////////////////////////////
+
+// Use the following to check if a feature is known to be available at
+// compile time. See README.md for an example.
+#if defined(CPU_FEATURES_ARCH_X86)
+
+#if defined(__AES__)
+#define CPU_FEATURES_COMPILED_X86_AES 1
+#else
+#define CPU_FEATURES_COMPILED_X86_AES 0
+#endif  //  defined(__AES__)
+
+#if defined(__F16C__)
+#define CPU_FEATURES_COMPILED_X86_F16C 1
+#else
+#define CPU_FEATURES_COMPILED_X86_F16C 0
+#endif  //  defined(__F16C__)
+
+#if defined(__BMI__)
+#define CPU_FEATURES_COMPILED_X86_BMI 1
+#else
+#define CPU_FEATURES_COMPILED_X86_BMI 0
+#endif  //  defined(__BMI__)
+
+#if defined(__BMI2__)
+#define CPU_FEATURES_COMPILED_X86_BMI2 1
+#else
+#define CPU_FEATURES_COMPILED_X86_BMI2 0
+#endif  //  defined(__BMI2__)
+
+#if (defined(__SSE__) || (_M_IX86_FP >= 1))
+#define CPU_FEATURES_COMPILED_X86_SSE 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSE 0
+#endif
+
+#if (defined(__SSE2__) || (_M_IX86_FP >= 2))
+#define CPU_FEATURES_COMPILED_X86_SSE2 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSE2 0
+#endif
+
+#if defined(__SSE3__)
+#define CPU_FEATURES_COMPILED_X86_SSE3 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSE3 0
+#endif  //  defined(__SSE3__)
+
+#if defined(__SSSE3__)
+#define CPU_FEATURES_COMPILED_X86_SSSE3 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSSE3 0
+#endif  //  defined(__SSSE3__)
+
+#if defined(__SSE4_1__)
+#define CPU_FEATURES_COMPILED_X86_SSE4_1 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSE4_1 0
+#endif  //  defined(__SSE4_1__)
+
+#if defined(__SSE4_2__)
+#define CPU_FEATURES_COMPILED_X86_SSE4_2 1
+#else
+#define CPU_FEATURES_COMPILED_X86_SSE4_2 0
+#endif  //  defined(__SSE4_2__)
+
+#if defined(__AVX__)
+#define CPU_FEATURES_COMPILED_X86_AVX 1
+#else
+#define CPU_FEATURES_COMPILED_X86_AVX 0
+#endif  //  defined(__AVX__)
+
+#if defined(__AVX2__)
+#define CPU_FEATURES_COMPILED_X86_AVX2 1
+#else
+#define CPU_FEATURES_COMPILED_X86_AVX2 0
+#endif  //  defined(__AVX2__)
+
+#endif  // defined(CPU_FEATURES_ARCH_X86)
+
+#if defined(CPU_FEATURES_ARCH_ANY_ARM)
+#if defined(__ARM_NEON__)
+#define CPU_FEATURES_COMPILED_ANY_ARM_NEON 1
+#else
+#define CPU_FEATURES_COMPILED_ANY_ARM_NEON 0
+#endif  //  defined(__ARM_NEON__)
+#endif  //  defined(CPU_FEATURES_ARCH_ANY_ARM)
+
+#if defined(CPU_FEATURES_ARCH_MIPS)
+#if defined(__mips_msa)
+#define CPU_FEATURES_COMPILED_MIPS_MSA 1
+#else
+#define CPU_FEATURES_COMPILED_MIPS_MSA 0
+#endif  //  defined(__mips_msa)
+#endif  //  defined(CPU_FEATURES_ARCH_MIPS)
+
+#endif  // CPU_FEATURES_INCLUDE_CPU_FEATURES_MACROS_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpuinfo_aarch64.h

@@ -0,0 +1,149 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_
+
+#include "cpu_features_cache_info.h"
+#include "cpu_features_macros.h"
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    int fp : 1;          // Floating-point.
+    int asimd : 1;       // Advanced SIMD.
+    int evtstrm : 1;     // Generic timer generated events.
+    int aes : 1;         // Hardware-accelerated Advanced Encryption Standard.
+    int pmull : 1;       // Polynomial multiply long.
+    int sha1 : 1;        // Hardware-accelerated SHA1.
+    int sha2 : 1;        // Hardware-accelerated SHA2-256.
+    int crc32 : 1;       // Hardware-accelerated CRC-32.
+    int atomics : 1;     // Armv8.1 atomic instructions.
+    int fphp : 1;        // Half-precision floating point support.
+    int asimdhp : 1;     // Advanced SIMD half-precision support.
+    int cpuid : 1;       // Access to certain ID registers.
+    int asimdrdm : 1;    // Rounding Double Multiply Accumulate/Subtract.
+    int jscvt : 1;       // Support for JavaScript conversion.
+    int fcma : 1;        // Floating point complex numbers.
+    int lrcpc : 1;       // Support for weaker release consistency.
+    int dcpop : 1;       // Data persistence writeback.
+    int sha3 : 1;        // Hardware-accelerated SHA3.
+    int sm3 : 1;         // Hardware-accelerated SM3.
+    int sm4 : 1;         // Hardware-accelerated SM4.
+    int asimddp : 1;     // Dot product instruction.
+    int sha512 : 1;      // Hardware-accelerated SHA512.
+    int sve : 1;         // Scalable Vector Extension.
+    int asimdfhm : 1;    // Additional half-precision instructions.
+    int dit : 1;         // Data independent timing.
+    int uscat : 1;       // Unaligned atomics support.
+    int ilrcpc : 1;      // Additional support for weaker release consistency.
+    int flagm : 1;       // Flag manipulation instructions.
+    int ssbs : 1;        // Speculative Store Bypass Safe PSTATE bit.
+    int sb : 1;          // Speculation barrier.
+    int paca : 1;        // Address authentication.
+    int pacg : 1;        // Generic authentication.
+    int dcpodp : 1;      // Data cache clean to point of persistence.
+    int sve2 : 1;        // Scalable Vector Extension (version 2).
+    int sveaes : 1;      // SVE AES instructions.
+    int svepmull : 1;    // SVE polynomial multiply long instructions.
+    int svebitperm : 1;  // SVE bit permute instructions.
+    int svesha3 : 1;     // SVE SHA3 instructions.
+    int svesm4 : 1;      // SVE SM4 instructions.
+    int flagm2 : 1;      // Additional flag manipulation instructions.
+    int frint : 1;       // Floating point to integer rounding.
+    int svei8mm : 1;     // SVE Int8 matrix multiplication instructions.
+    int svef32mm : 1;    // SVE FP32 matrix multiplication instruction.
+    int svef64mm : 1;    // SVE FP64 matrix multiplication instructions.
+    int svebf16 : 1;     // SVE BFloat16 instructions.
+    int i8mm : 1;        // Int8 matrix multiplication instructions.
+    int bf16 : 1;        // BFloat16 instructions.
+    int dgh : 1;         // Data Gathering Hint instruction.
+    int rng : 1;         // True random number generator support.
+    int bti : 1;         // Branch target identification.
+
+    // Make sure to update Aarch64FeaturesEnum below if you add a field here.
+} Aarch64Features;
+
+typedef struct
+{
+    Aarch64Features features;
+    int implementer;
+    int variant;
+    int part;
+    int revision;
+} Aarch64Info;
+
+Aarch64Info GetAarch64Info(void);
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+typedef enum
+{
+    AARCH64_FP,
+    AARCH64_ASIMD,
+    AARCH64_EVTSTRM,
+    AARCH64_AES,
+    AARCH64_PMULL,
+    AARCH64_SHA1,
+    AARCH64_SHA2,
+    AARCH64_CRC32,
+    AARCH64_ATOMICS,
+    AARCH64_FPHP,
+    AARCH64_ASIMDHP,
+    AARCH64_CPUID,
+    AARCH64_ASIMDRDM,
+    AARCH64_JSCVT,
+    AARCH64_FCMA,
+    AARCH64_LRCPC,
+    AARCH64_DCPOP,
+    AARCH64_SHA3,
+    AARCH64_SM3,
+    AARCH64_SM4,
+    AARCH64_ASIMDDP,
+    AARCH64_SHA512,
+    AARCH64_SVE,
+    AARCH64_ASIMDFHM,
+    AARCH64_DIT,
+    AARCH64_USCAT,
+    AARCH64_ILRCPC,
+    AARCH64_FLAGM,
+    AARCH64_SSBS,
+    AARCH64_SB,
+    AARCH64_PACA,
+    AARCH64_PACG,
+    AARCH64_DCPODP,
+    AARCH64_SVE2,
+    AARCH64_SVEAES,
+    AARCH64_SVEPMULL,
+    AARCH64_SVEBITPERM,
+    AARCH64_SVESHA3,
+    AARCH64_SVESM4,
+    AARCH64_FLAGM2,
+    AARCH64_FRINT,
+    AARCH64_SVEI8MM,
+    AARCH64_SVEF32MM,
+    AARCH64_SVEF64MM,
+    AARCH64_SVEBF16,
+    AARCH64_I8MM,
+    AARCH64_BF16,
+    AARCH64_DGH,
+    AARCH64_RNG,
+    AARCH64_BTI,
+    AARCH64_LAST_,
+} Aarch64FeaturesEnum;
+
+int GetAarch64FeaturesEnumValue(const Aarch64Features* features,
+    Aarch64FeaturesEnum value);
+
+const char* GetAarch64FeaturesEnumName(Aarch64FeaturesEnum);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#if !defined(CPU_FEATURES_ARCH_AARCH64)
+#error "Including cpuinfo_aarch64.h from a non-aarch64 target."
+#endif
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_AARCH64_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpuinfo_arm.h

@@ -0,0 +1,113 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_
+
+#include "cpu_features_cache_info.h"
+#include "cpu_features_macros.h"
+#include <stdint.h>  // uint32_t
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    int swp : 1;       // SWP instruction (atomic read-modify-write)
+    int half : 1;      // Half-word loads and stores
+    int thumb : 1;     // Thumb (16-bit instruction set)
+    int _26bit : 1;    // "26 Bit" Model (Processor status register folded into
+                       // program counter)
+    int fastmult : 1;  // 32x32->64-bit multiplication
+    int fpa : 1;       // Floating point accelerator
+    int vfp : 1;       // Vector Floating Point.
+    int edsp : 1;      // DSP extensions (the 'e' variant of the ARM9 CPUs, and all
+                       // others above)
+    int java : 1;      // Jazelle (Java bytecode accelerator)
+    int iwmmxt : 1;    // Intel Wireless MMX Technology.
+    int crunch : 1;    // MaverickCrunch coprocessor
+    int thumbee : 1;   // ThumbEE
+    int neon : 1;      // Advanced SIMD.
+    int vfpv3 : 1;     // VFP version 3
+    int vfpv3d16 : 1;  // VFP version 3 with 16 D-registers
+    int tls : 1;       // TLS register
+    int vfpv4 : 1;     // VFP version 4 with fast context switching
+    int idiva : 1;     // SDIV and UDIV hardware division in ARM mode.
+    int idivt : 1;     // SDIV and UDIV hardware division in Thumb mode.
+    int vfpd32 : 1;    // VFP with 32 D-registers
+    int lpae : 1;      // Large Physical Address Extension (>4GB physical memory on
+                       // 32-bit architecture)
+    int evtstrm : 1;   // kernel event stream using generic architected timer
+    int aes : 1;       // Hardware-accelerated Advanced Encryption Standard.
+    int pmull : 1;     // Polynomial multiply long.
+    int sha1 : 1;      // Hardware-accelerated SHA1.
+    int sha2 : 1;      // Hardware-accelerated SHA2-256.
+    int crc32 : 1;     // Hardware-accelerated CRC-32.
+
+    // Make sure to update ArmFeaturesEnum below if you add a field here.
+} ArmFeatures;
+
+typedef struct
+{
+    ArmFeatures features;
+    int implementer;
+    int architecture;
+    int variant;
+    int part;
+    int revision;
+} ArmInfo;
+
+// TODO(user): Add macros to know which features are present at compile
+// time.
+
+ArmInfo GetArmInfo(void);
+
+// Compute CpuId from ArmInfo.
+uint32_t GetArmCpuId(const ArmInfo* const info);
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+typedef enum
+{
+    ARM_SWP,
+    ARM_HALF,
+    ARM_THUMB,
+    ARM_26BIT,
+    ARM_FASTMULT,
+    ARM_FPA,
+    ARM_VFP,
+    ARM_EDSP,
+    ARM_JAVA,
+    ARM_IWMMXT,
+    ARM_CRUNCH,
+    ARM_THUMBEE,
+    ARM_NEON,
+    ARM_VFPV3,
+    ARM_VFPV3D16,
+    ARM_TLS,
+    ARM_VFPV4,
+    ARM_IDIVA,
+    ARM_IDIVT,
+    ARM_VFPD32,
+    ARM_LPAE,
+    ARM_EVTSTRM,
+    ARM_AES,
+    ARM_PMULL,
+    ARM_SHA1,
+    ARM_SHA2,
+    ARM_CRC32,
+    ARM_LAST_,
+} ArmFeaturesEnum;
+
+int GetArmFeaturesEnumValue(const ArmFeatures* features, ArmFeaturesEnum value);
+
+const char* GetArmFeaturesEnumName(ArmFeaturesEnum);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#if !defined(CPU_FEATURES_ARCH_ARM)
+#error "Including cpuinfo_arm.h from a non-arm target."
+#endif
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_ARM_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpuinfo_mips.h

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_
+
+#include "cpu_features_cache_info.h"
+#include "cpu_features_macros.h"
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    int msa : 1;  // MIPS SIMD Architecture
+                  // https://www.mips.com/products/architectures/ase/simd/
+    int eva : 1;  // Enhanced Virtual Addressing
+                  // https://www.mips.com/products/architectures/mips64/
+    int r6 : 1;   // True if is release 6 of the processor.
+
+    // Make sure to update MipsFeaturesEnum below if you add a field here.
+} MipsFeatures;
+
+typedef struct
+{
+    MipsFeatures features;
+} MipsInfo;
+
+MipsInfo GetMipsInfo(void);
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+typedef enum
+{
+    MIPS_MSA,
+    MIPS_EVA,
+    MIPS_R6,
+    MIPS_LAST_,
+} MipsFeaturesEnum;
+
+int GetMipsFeaturesEnumValue(const MipsFeatures* features,
+    MipsFeaturesEnum value);
+
+const char* GetMipsFeaturesEnumName(MipsFeaturesEnum);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#if !defined(CPU_FEATURES_ARCH_MIPS)
+#error "Including cpuinfo_mips.h from a non-mips target."
+#endif
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_MIPS_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpuinfo_ppc.h

@@ -0,0 +1,140 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_PPC_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_PPC_H_
+
+#include "cpu_features_cache_info.h"
+#include "cpu_features_macros.h"
+#include "internal/hwcaps.h"
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    int ppc32 : 1;
+    int ppc64 : 1;
+    int ppc601 : 1;
+    int altivec : 1;
+    int fpu : 1;
+    int mmu : 1;
+    int mac_4xx : 1;
+    int unifiedcache : 1;
+    int spe : 1;
+    int efpsingle : 1;
+    int efpdouble : 1;
+    int no_tb : 1;
+    int power4 : 1;
+    int power5 : 1;
+    int power5plus : 1;
+    int cell : 1;
+    int booke : 1;
+    int smt : 1;
+    int icachesnoop : 1;
+    int arch205 : 1;
+    int pa6t : 1;
+    int dfp : 1;
+    int power6ext : 1;
+    int arch206 : 1;
+    int vsx : 1;
+    int pseries_perfmon_compat : 1;
+    int truele : 1;
+    int ppcle : 1;
+    int arch207 : 1;
+    int htm : 1;
+    int dscr : 1;
+    int ebb : 1;
+    int isel : 1;
+    int tar : 1;
+    int vcrypto : 1;
+    int htm_nosc : 1;
+    int arch300 : 1;
+    int ieee128 : 1;
+    int darn : 1;
+    int scv : 1;
+    int htm_no_suspend : 1;
+
+    // Make sure to update PPCFeaturesEnum below if you add a field here.
+} PPCFeatures;
+
+typedef struct
+{
+    PPCFeatures features;
+} PPCInfo;
+
+// This function is guaranteed to be malloc, memset and memcpy free.
+PPCInfo GetPPCInfo(void);
+
+typedef struct
+{
+    char platform[64];  // 0 terminated string
+    char model[64];     // 0 terminated string
+    char machine[64];   // 0 terminated string
+    char cpu[64];       // 0 terminated string
+    PlatformType type;
+} PPCPlatformStrings;
+
+PPCPlatformStrings GetPPCPlatformStrings(void);
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+typedef enum
+{
+    PPC_32,          /* 32 bit mode execution */
+    PPC_64,          /* 64 bit mode execution */
+    PPC_601_INSTR,   /* Old POWER ISA */
+    PPC_HAS_ALTIVEC, /* SIMD Unit*/
+    PPC_HAS_FPU,     /* Floating Point Unit */
+    PPC_HAS_MMU,     /* Memory management unit */
+    PPC_HAS_4xxMAC,
+    PPC_UNIFIED_CACHE,  /* Unified instruction and data cache */
+    PPC_HAS_SPE,        /* Signal processing extention unit */
+    PPC_HAS_EFP_SINGLE, /* SPE single precision fpu */
+    PPC_HAS_EFP_DOUBLE, /* SPE double precision fpu */
+    PPC_NO_TB,          /* No timebase */
+    PPC_POWER4,
+    PPC_POWER5,
+    PPC_POWER5_PLUS,
+    PPC_CELL,  /* Cell broadband engine */
+    PPC_BOOKE, /* Embedded ISA */
+    PPC_SMT,   /* Simultaneous multi-threading */
+    PPC_ICACHE_SNOOP,
+    PPC_ARCH_2_05, /* ISA 2.05 - POWER6 */
+    PPC_PA6T,      /* PA Semi 6T core ISA */
+    PPC_HAS_DFP,   /* Decimal floating point unit */
+    PPC_POWER6_EXT,
+    PPC_ARCH_2_06,              /* ISA 2.06 - POWER7 */
+    PPC_HAS_VSX,                /* Vector-scalar extension */
+    PPC_PSERIES_PERFMON_COMPAT, /* Set of backwards compatibile performance
+                                 monitoring events */
+    PPC_TRUE_LE,
+    PPC_PPC_LE,
+    PPC_ARCH_2_07,      /* ISA 2.07 - POWER8 */
+    PPC_HTM,            /* Hardware Transactional Memory */
+    PPC_DSCR,           /* Data stream control register */
+    PPC_EBB,            /* Event base branching */
+    PPC_ISEL,           /* Integer select instructions */
+    PPC_TAR,            /* Target address register */
+    PPC_VEC_CRYPTO,     /* Vector cryptography instructions */
+    PPC_HTM_NOSC,       /* Transactions aborted when syscall made*/
+    PPC_ARCH_3_00,      /* ISA 3.00 - POWER9 */
+    PPC_HAS_IEEE128,    /* VSX IEEE Binary Float 128-bit */
+    PPC_DARN,           /* Deliver a random number instruction */
+    PPC_SCV,            /* scv syscall */
+    PPC_HTM_NO_SUSPEND, /* TM w/out suspended state */
+    PPC_LAST_,
+} PPCFeaturesEnum;
+
+int GetPPCFeaturesEnumValue(const PPCFeatures* features, PPCFeaturesEnum value);
+
+const char* GetPPCFeaturesEnumName(PPCFeaturesEnum);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#if !defined(CPU_FEATURES_ARCH_PPC)
+#error "Including cpuinfo_ppc.h from a non-ppc target."
+#endif
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_PPC_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/cpuinfo_x86.h

@@ -0,0 +1,224 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
+#define CPU_FEATURES_INCLUDE_CPUINFO_X86_H_
+
+#include "cpu_features_cache_info.h"
+#include "cpu_features_macros.h"
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+// See https://en.wikipedia.org/wiki/CPUID for a list of x86 cpu features.
+// The field names are based on the short name provided in the wikipedia tables.
+typedef struct
+{
+    int fpu : 1;
+    int tsc : 1;
+    int cx8 : 1;
+    int clfsh : 1;
+    int mmx : 1;
+    int aes : 1;
+    int erms : 1;
+    int f16c : 1;
+    int fma4 : 1;
+    int fma3 : 1;
+    int vaes : 1;
+    int vpclmulqdq : 1;
+    int bmi1 : 1;
+    int hle : 1;
+    int bmi2 : 1;
+    int rtm : 1;
+    int rdseed : 1;
+    int clflushopt : 1;
+    int clwb : 1;
+
+    int sse : 1;
+    int sse2 : 1;
+    int sse3 : 1;
+    int ssse3 : 1;
+    int sse4_1 : 1;
+    int sse4_2 : 1;
+    int sse4a : 1;
+
+    int avx : 1;
+    int avx2 : 1;
+
+    int avx512f : 1;
+    int avx512cd : 1;
+    int avx512er : 1;
+    int avx512pf : 1;
+    int avx512bw : 1;
+    int avx512dq : 1;
+    int avx512vl : 1;
+    int avx512ifma : 1;
+    int avx512vbmi : 1;
+    int avx512vbmi2 : 1;
+    int avx512vnni : 1;
+    int avx512bitalg : 1;
+    int avx512vpopcntdq : 1;
+    int avx512_4vnniw : 1;
+    int avx512_4vbmi2 : 1;
+    int avx512_second_fma : 1;
+    int avx512_4fmaps : 1;
+    int avx512_bf16 : 1;
+    int avx512_vp2intersect : 1;
+    int amx_bf16 : 1;
+    int amx_tile : 1;
+    int amx_int8 : 1;
+
+    int pclmulqdq : 1;
+    int smx : 1;
+    int sgx : 1;
+    int cx16 : 1;  // aka. CMPXCHG16B
+    int sha : 1;
+    int popcnt : 1;
+    int movbe : 1;
+    int rdrnd : 1;
+
+    int dca : 1;
+    int ss : 1;
+    // Make sure to update X86FeaturesEnum below if you add a field here.
+} X86Features;
+
+typedef struct
+{
+    X86Features features;
+    int family;
+    int model;
+    int stepping;
+    char vendor[13];  // 0 terminated string
+} X86Info;
+
+// Calls cpuid and returns an initialized X86info.
+// This function is guaranteed to be malloc, memset and memcpy free.
+X86Info GetX86Info(void);
+
+// Returns cache hierarchy informations.
+// Can call cpuid multiple times.
+// Only works on Intel CPU at the moment.
+// This function is guaranteed to be malloc, memset and memcpy free.
+CacheInfo GetX86CacheInfo(void);
+
+typedef enum
+{
+    X86_UNKNOWN,
+    INTEL_CORE,      // CORE
+    INTEL_PNR,       // PENRYN
+    INTEL_NHM,       // NEHALEM
+    INTEL_ATOM_BNL,  // BONNELL
+    INTEL_WSM,       // WESTMERE
+    INTEL_SNB,       // SANDYBRIDGE
+    INTEL_IVB,       // IVYBRIDGE
+    INTEL_ATOM_SMT,  // SILVERMONT
+    INTEL_HSW,       // HASWELL
+    INTEL_BDW,       // BROADWELL
+    INTEL_SKL,       // SKYLAKE
+    INTEL_ATOM_GMT,  // GOLDMONT
+    INTEL_KBL,       // KABY LAKE
+    INTEL_CFL,       // COFFEE LAKE
+    INTEL_WHL,       // WHISKEY LAKE
+    INTEL_CNL,       // CANNON LAKE
+    INTEL_ICL,       // ICE LAKE
+    INTEL_TGL,       // TIGER LAKE
+    INTEL_SPR,       // SAPPHIRE RAPIDS
+    AMD_HAMMER,      // K8
+    AMD_K10,         // K10
+    AMD_BOBCAT,      // K14
+    AMD_BULLDOZER,   // K15
+    AMD_JAGUAR,      // K16
+    AMD_ZEN,         // K17
+} X86Microarchitecture;
+
+// Returns the underlying microarchitecture by looking at X86Info's vendor,
+// family and model.
+X86Microarchitecture GetX86Microarchitecture(const X86Info* info);
+
+// Calls cpuid and fills the brand_string.
+// - brand_string *must* be of size 49 (beware of array decaying).
+// - brand_string will be zero terminated.
+// - This function calls memcpy.
+void FillX86BrandString(char brand_string[49]);
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+typedef enum
+{
+    X86_FPU,
+    X86_TSC,
+    X86_CX8,
+    X86_CLFSH,
+    X86_MMX,
+    X86_AES,
+    X86_ERMS,
+    X86_F16C,
+    X86_FMA4,
+    X86_FMA3,
+    X86_VAES,
+    X86_VPCLMULQDQ,
+    X86_BMI1,
+    X86_HLE,
+    X86_BMI2,
+    X86_RTM,
+    X86_RDSEED,
+    X86_CLFLUSHOPT,
+    X86_CLWB,
+    X86_SSE,
+    X86_SSE2,
+    X86_SSE3,
+    X86_SSSE3,
+    X86_SSE4_1,
+    X86_SSE4_2,
+    X86_SSE4A,
+    X86_AVX,
+    X86_AVX2,
+    X86_AVX512F,
+    X86_AVX512CD,
+    X86_AVX512ER,
+    X86_AVX512PF,
+    X86_AVX512BW,
+    X86_AVX512DQ,
+    X86_AVX512VL,
+    X86_AVX512IFMA,
+    X86_AVX512VBMI,
+    X86_AVX512VBMI2,
+    X86_AVX512VNNI,
+    X86_AVX512BITALG,
+    X86_AVX512VPOPCNTDQ,
+    X86_AVX512_4VNNIW,
+    X86_AVX512_4VBMI2,
+    X86_AVX512_SECOND_FMA,
+    X86_AVX512_4FMAPS,
+    X86_AVX512_BF16,
+    X86_AVX512_VP2INTERSECT,
+    X86_AMX_BF16,
+    X86_AMX_TILE,
+    X86_AMX_INT8,
+    X86_PCLMULQDQ,
+    X86_SMX,
+    X86_SGX,
+    X86_CX16,
+    X86_SHA,
+    X86_POPCNT,
+    X86_MOVBE,
+    X86_RDRND,
+    X86_DCA,
+    X86_SS,
+    X86_LAST_,
+} X86FeaturesEnum;
+
+int GetX86FeaturesEnumValue(const X86Features* features, X86FeaturesEnum value);
+
+const char* GetX86FeaturesEnumName(X86FeaturesEnum);
+
+const char* GetX86MicroarchitectureName(X86Microarchitecture);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#if !defined(CPU_FEATURES_ARCH_X86)
+#error "Including cpuinfo_x86.h from a non-x86 target."
+#endif
+
+#endif  // CPU_FEATURES_INCLUDE_CPUINFO_X86_H

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/bit_utils.h

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
+
+#include "cpu_features_macros.h"
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+inline static bool IsBitSet(uint32_t reg, uint32_t bit)
+{
+    return (reg >> bit) & 0x1;
+}
+
+inline static uint32_t ExtractBitRange(uint32_t reg, uint32_t msb,
+    uint32_t lsb)
+{
+    const uint64_t bits = msb - lsb + 1ULL;
+    const uint64_t mask = (1ULL << bits) - 1ULL;
+    assert(msb >= lsb);
+    return (reg >> lsb) & mask;
+}
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/cpuid_x86.h

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_
+
+#include "cpu_features_macros.h"
+#include <stdint.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+// A struct to hold the result of a call to cpuid.
+typedef struct
+{
+    uint32_t eax, ebx, ecx, edx;
+} Leaf;
+
+// Returns the result of a call to the cpuid instruction.
+Leaf GetCpuidLeaf(uint32_t leaf_id, int ecx);
+
+// Returns the eax value of the XCR0 register.
+uint32_t GetXCR0Eax(void);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/filesystem.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+// An interface for the filesystem that allows mocking the filesystem in
+// unittests.
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_
+
+#include "cpu_features_macros.h"
+#include <stddef.h>
+#include <stdint.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+// Same as linux "open(filename, O_RDONLY)", retries automatically on EINTR.
+int CpuFeatures_OpenFile(const char* filename);
+
+// Same as linux "read(file_descriptor, buffer, buffer_size)", retries
+// automatically on EINTR.
+int CpuFeatures_ReadFile(int file_descriptor, void* buffer, size_t buffer_size);
+
+// Same as linux "close(file_descriptor)".
+void CpuFeatures_CloseFile(int file_descriptor);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_FILESYSTEM_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/hwcaps.h

@@ -0,0 +1,177 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+// Interface to retrieve hardware capabilities. It relies on Linux's getauxval
+// or `/proc/self/auxval` under the hood.
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_
+
+#include "cpu_features_macros.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+// To avoid depending on the linux kernel we reproduce the architecture specific
+// constants here.
+
+// http://elixir.free-electrons.com/linux/latest/source/arch/arm64/include/uapi/asm/hwcap.h
+#define AARCH64_HWCAP_FP (1UL << 0)
+#define AARCH64_HWCAP_ASIMD (1UL << 1)
+#define AARCH64_HWCAP_EVTSTRM (1UL << 2)
+#define AARCH64_HWCAP_AES (1UL << 3)
+#define AARCH64_HWCAP_PMULL (1UL << 4)
+#define AARCH64_HWCAP_SHA1 (1UL << 5)
+#define AARCH64_HWCAP_SHA2 (1UL << 6)
+#define AARCH64_HWCAP_CRC32 (1UL << 7)
+#define AARCH64_HWCAP_ATOMICS (1UL << 8)
+#define AARCH64_HWCAP_FPHP (1UL << 9)
+#define AARCH64_HWCAP_ASIMDHP (1UL << 10)
+#define AARCH64_HWCAP_CPUID (1UL << 11)
+#define AARCH64_HWCAP_ASIMDRDM (1UL << 12)
+#define AARCH64_HWCAP_JSCVT (1UL << 13)
+#define AARCH64_HWCAP_FCMA (1UL << 14)
+#define AARCH64_HWCAP_LRCPC (1UL << 15)
+#define AARCH64_HWCAP_DCPOP (1UL << 16)
+#define AARCH64_HWCAP_SHA3 (1UL << 17)
+#define AARCH64_HWCAP_SM3 (1UL << 18)
+#define AARCH64_HWCAP_SM4 (1UL << 19)
+#define AARCH64_HWCAP_ASIMDDP (1UL << 20)
+#define AARCH64_HWCAP_SHA512 (1UL << 21)
+#define AARCH64_HWCAP_SVE (1UL << 22)
+#define AARCH64_HWCAP_ASIMDFHM (1UL << 23)
+#define AARCH64_HWCAP_DIT (1UL << 24)
+#define AARCH64_HWCAP_USCAT (1UL << 25)
+#define AARCH64_HWCAP_ILRCPC (1UL << 26)
+#define AARCH64_HWCAP_FLAGM (1UL << 27)
+#define AARCH64_HWCAP_SSBS (1UL << 28)
+#define AARCH64_HWCAP_SB (1UL << 29)
+#define AARCH64_HWCAP_PACA (1UL << 30)
+#define AARCH64_HWCAP_PACG (1UL << 31)
+
+#define AARCH64_HWCAP2_DCPODP (1UL << 0)
+#define AARCH64_HWCAP2_SVE2 (1UL << 1)
+#define AARCH64_HWCAP2_SVEAES (1UL << 2)
+#define AARCH64_HWCAP2_SVEPMULL (1UL << 3)
+#define AARCH64_HWCAP2_SVEBITPERM (1UL << 4)
+#define AARCH64_HWCAP2_SVESHA3 (1UL << 5)
+#define AARCH64_HWCAP2_SVESM4 (1UL << 6)
+#define AARCH64_HWCAP2_FLAGM2 (1UL << 7)
+#define AARCH64_HWCAP2_FRINT (1UL << 8)
+#define AARCH64_HWCAP2_SVEI8MM (1UL << 9)
+#define AARCH64_HWCAP2_SVEF32MM (1UL << 10)
+#define AARCH64_HWCAP2_SVEF64MM (1UL << 11)
+#define AARCH64_HWCAP2_SVEBF16 (1UL << 12)
+#define AARCH64_HWCAP2_I8MM (1UL << 13)
+#define AARCH64_HWCAP2_BF16 (1UL << 14)
+#define AARCH64_HWCAP2_DGH (1UL << 15)
+#define AARCH64_HWCAP2_RNG (1UL << 16)
+#define AARCH64_HWCAP2_BTI (1UL << 17)
+
+// http://elixir.free-electrons.com/linux/latest/source/arch/arm/include/uapi/asm/hwcap.h
+#define ARM_HWCAP_SWP (1UL << 0)
+#define ARM_HWCAP_HALF (1UL << 1)
+#define ARM_HWCAP_THUMB (1UL << 2)
+#define ARM_HWCAP_26BIT (1UL << 3)
+#define ARM_HWCAP_FAST_MULT (1UL << 4)
+#define ARM_HWCAP_FPA (1UL << 5)
+#define ARM_HWCAP_VFP (1UL << 6)
+#define ARM_HWCAP_EDSP (1UL << 7)
+#define ARM_HWCAP_JAVA (1UL << 8)
+#define ARM_HWCAP_IWMMXT (1UL << 9)
+#define ARM_HWCAP_CRUNCH (1UL << 10)
+#define ARM_HWCAP_THUMBEE (1UL << 11)
+#define ARM_HWCAP_NEON (1UL << 12)
+#define ARM_HWCAP_VFPV3 (1UL << 13)
+#define ARM_HWCAP_VFPV3D16 (1UL << 14)
+#define ARM_HWCAP_TLS (1UL << 15)
+#define ARM_HWCAP_VFPV4 (1UL << 16)
+#define ARM_HWCAP_IDIVA (1UL << 17)
+#define ARM_HWCAP_IDIVT (1UL << 18)
+#define ARM_HWCAP_VFPD32 (1UL << 19)
+#define ARM_HWCAP_LPAE (1UL << 20)
+#define ARM_HWCAP_EVTSTRM (1UL << 21)
+#define ARM_HWCAP2_AES (1UL << 0)
+#define ARM_HWCAP2_PMULL (1UL << 1)
+#define ARM_HWCAP2_SHA1 (1UL << 2)
+#define ARM_HWCAP2_SHA2 (1UL << 3)
+#define ARM_HWCAP2_CRC32 (1UL << 4)
+
+// http://elixir.free-electrons.com/linux/latest/source/arch/mips/include/uapi/asm/hwcap.h
+#define MIPS_HWCAP_R6 (1UL << 0)
+#define MIPS_HWCAP_MSA (1UL << 1)
+#define MIPS_HWCAP_CRC32 (1UL << 2)
+
+// http://elixir.free-electrons.com/linux/latest/source/arch/powerpc/include/uapi/asm/cputable.h
+#ifndef _UAPI__ASM_POWERPC_CPUTABLE_H
+/* in AT_HWCAP */
+#define PPC_FEATURE_32 0x80000000
+#define PPC_FEATURE_64 0x40000000
+#define PPC_FEATURE_601_INSTR 0x20000000
+#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
+#define PPC_FEATURE_HAS_FPU 0x08000000
+#define PPC_FEATURE_HAS_MMU 0x04000000
+#define PPC_FEATURE_HAS_4xxMAC 0x02000000
+#define PPC_FEATURE_UNIFIED_CACHE 0x01000000
+#define PPC_FEATURE_HAS_SPE 0x00800000
+#define PPC_FEATURE_HAS_EFP_SINGLE 0x00400000
+#define PPC_FEATURE_HAS_EFP_DOUBLE 0x00200000
+#define PPC_FEATURE_NO_TB 0x00100000
+#define PPC_FEATURE_POWER4 0x00080000
+#define PPC_FEATURE_POWER5 0x00040000
+#define PPC_FEATURE_POWER5_PLUS 0x00020000
+#define PPC_FEATURE_CELL 0x00010000
+#define PPC_FEATURE_BOOKE 0x00008000
+#define PPC_FEATURE_SMT 0x00004000
+#define PPC_FEATURE_ICACHE_SNOOP 0x00002000
+#define PPC_FEATURE_ARCH_2_05 0x00001000
+#define PPC_FEATURE_PA6T 0x00000800
+#define PPC_FEATURE_HAS_DFP 0x00000400
+#define PPC_FEATURE_POWER6_EXT 0x00000200
+#define PPC_FEATURE_ARCH_2_06 0x00000100
+#define PPC_FEATURE_HAS_VSX 0x00000080
+
+#define PPC_FEATURE_PSERIES_PERFMON_COMPAT 0x00000040
+
+/* Reserved - do not use                0x00000004 */
+#define PPC_FEATURE_TRUE_LE 0x00000002
+#define PPC_FEATURE_PPC_LE 0x00000001
+
+/* in AT_HWCAP2 */
+#define PPC_FEATURE2_ARCH_2_07 0x80000000
+#define PPC_FEATURE2_HTM 0x40000000
+#define PPC_FEATURE2_DSCR 0x20000000
+#define PPC_FEATURE2_EBB 0x10000000
+#define PPC_FEATURE2_ISEL 0x08000000
+#define PPC_FEATURE2_TAR 0x04000000
+#define PPC_FEATURE2_VEC_CRYPTO 0x02000000
+#define PPC_FEATURE2_HTM_NOSC 0x01000000
+#define PPC_FEATURE2_ARCH_3_00 0x00800000
+#define PPC_FEATURE2_HAS_IEEE128 0x00400000
+#define PPC_FEATURE2_DARN 0x00200000
+#define PPC_FEATURE2_SCV 0x00100000
+#define PPC_FEATURE2_HTM_NO_SUSPEND 0x00080000
+#endif
+
+typedef struct
+{
+    unsigned long hwcaps;
+    unsigned long hwcaps2;
+} HardwareCapabilities;
+
+HardwareCapabilities CpuFeatures_GetHardwareCapabilities(void);
+bool CpuFeatures_IsHwCapsSet(const HardwareCapabilities hwcaps_mask,
+    const HardwareCapabilities hwcaps);
+
+typedef struct
+{
+    char platform[64];       // 0 terminated string
+    char base_platform[64];  // 0 terminated string
+} PlatformType;
+
+PlatformType CpuFeatures_GetPlatformType(void);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_HWCAPS_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/stack_line_reader.h

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+// Reads a file line by line and stores the data on the stack. This allows
+// parsing files in one go without allocating.
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_
+
+#include "cpu_features_macros.h"
+#include "internal/string_view.h"
+#include <stdbool.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    char buffer[STACK_LINE_READER_BUFFER_SIZE];
+    StringView view;
+    int fd;
+    bool skip_mode;
+} StackLineReader;
+
+// Initializes a StackLineReader.
+void StackLineReader_Initialize(StackLineReader* reader, int fd);
+
+typedef struct
+{
+    StringView line;  // A view of the line.
+    bool eof;         // Nothing more to read, we reached EOF.
+    bool full_line;   // If false the line was truncated to
+                      // STACK_LINE_READER_BUFFER_SIZE.
+} LineResult;
+
+// Reads the file pointed to by fd and tries to read a full line.
+LineResult StackLineReader_NextLine(StackLineReader* reader);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_STACK_LINE_READER_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/include/internal/string_view.h

@@ -0,0 +1,100 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+
+// A view over a piece of string. The view is not 0 terminated.
+#ifndef CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
+#define CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_
+
+#include "cpu_features_macros.h"
+#include <stdbool.h>
+#include <stddef.h>
+#include <string.h>
+
+CPU_FEATURES_START_CPP_NAMESPACE
+
+typedef struct
+{
+    const char* ptr;
+    size_t size;
+} StringView;
+
+#ifdef __cplusplus
+static const StringView kEmptyStringView = {NULL, 0};
+#else
+static const StringView kEmptyStringView;
+#endif
+
+// Returns a StringView from the provided string.
+// Passing NULL is valid only if size is 0.
+static inline StringView view(const char* str, const size_t size)
+{
+    StringView view;
+    view.ptr = str;
+    view.size = size;
+    return view;
+}
+
+static inline StringView str(const char* str) { return view(str, strlen(str)); }
+
+// Returns the index of the first occurrence of c in view or -1 if not found.
+int CpuFeatures_StringView_IndexOfChar(const StringView view, char c);
+
+// Returns the index of the first occurrence of sub_view in view or -1 if not
+// found.
+int CpuFeatures_StringView_IndexOf(const StringView view,
+    const StringView sub_view);
+
+// Returns whether a is equal to b (same content).
+bool CpuFeatures_StringView_IsEquals(const StringView a, const StringView b);
+
+// Returns whether a starts with b.
+bool CpuFeatures_StringView_StartsWith(const StringView a, const StringView b);
+
+// Removes count characters from the beginning of view or kEmptyStringView if
+// count if greater than view.size.
+StringView CpuFeatures_StringView_PopFront(const StringView str_view,
+    size_t count);
+
+// Removes count characters from the end of view or kEmptyStringView if count if
+// greater than view.size.
+StringView CpuFeatures_StringView_PopBack(const StringView str_view,
+    size_t count);
+
+// Keeps the count first characters of view or view if count if greater than
+// view.size.
+StringView CpuFeatures_StringView_KeepFront(const StringView str_view,
+    size_t count);
+
+// Retrieves the first character of view. If view is empty the behavior is
+// undefined.
+char CpuFeatures_StringView_Front(const StringView view);
+
+// Retrieves the last character of view. If view is empty the behavior is
+// undefined.
+char CpuFeatures_StringView_Back(const StringView view);
+
+// Removes leading and tailing space characters.
+StringView CpuFeatures_StringView_TrimWhitespace(StringView view);
+
+// Convert StringView to positive integer. e.g. "42", "0x2a".
+// Returns -1 on error.
+int CpuFeatures_StringView_ParsePositiveNumber(const StringView view);
+
+// Copies src StringView to dst buffer.
+void CpuFeatures_StringView_CopyString(const StringView src, char* dst,
+    size_t dst_size);
+
+// Checks if line contains the specified whitespace separated word.
+bool CpuFeatures_StringView_HasWord(const StringView line,
+    const char* const word);
+
+// Get key/value from line. key and value are separated by ": ".
+// key and value are cleaned up from leading and trailing whitespaces.
+bool CpuFeatures_StringView_GetAttributeKeyValue(const StringView line,
+    StringView* key,
+    StringView* value);
+
+CPU_FEATURES_END_CPP_NAMESPACE
+
+#endif  // CPU_FEATURES_INCLUDE_INTERNAL_STRING_VIEW_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/ndk_compat/CMakeLists.txt

@@ -0,0 +1,62 @@
+# SPDX-FileCopyrightText: 2010 The Android Open Source Project
+# SPDX-License-Identifier: BSD-2-Clause
+
+#
+# library : NDK compat
+#
+find_package(Threads REQUIRED)
+set(NDK_COMPAT_HDRS cpu-features.h)
+set(NDK_COMPAT_SRCS
+  cpu-features.c
+  $<TARGET_OBJECTS:utils>
+  $<TARGET_OBJECTS:unix_based_hardware_detection>
+)
+# Note that following `add_cpu_features_headers_and_sources` will use
+# NDK_COMPAT_SRCS in lieu of NDK_COMPAT_HDRS because we don't want cpu_features
+# headers to be installed alongside ndk_compat.
+add_cpu_features_headers_and_sources(NDK_COMPAT_SRCS NDK_COMPAT_SRCS)
+add_library(ndk_compat ${NDK_COMPAT_HDRS} ${NDK_COMPAT_SRCS})
+setup_include_and_definitions(ndk_compat)
+target_include_directories(ndk_compat PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
+target_link_libraries(ndk_compat PUBLIC ${CMAKE_DL_LIBS} ${CMAKE_THREAD_LIBS_INIT})
+set_target_properties(ndk_compat PROPERTIES PUBLIC_HEADER "${NDK_COMPAT_HDRS}")
+
+include(GNUInstallDirs)
+install(TARGETS ndk_compat
+  EXPORT CpuFeaturesNdkCompatTargets
+  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ndk_compat
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+install(EXPORT CpuFeaturesNdkCompatTargets
+  NAMESPACE CpuFeatures::
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeaturesNdkCompat
+  COMPONENT Devel
+)
+include(CMakePackageConfigHelpers)
+configure_package_config_file(${PROJECT_SOURCE_DIR}/cmake/CpuFeaturesNdkCompatConfig.cmake.in
+  "${PROJECT_BINARY_DIR}/CpuFeaturesNdkCompatConfig.cmake"
+  INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeaturesNdkCompat"
+  NO_SET_AND_CHECK_MACRO
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO
+)
+write_basic_package_version_file(
+  "${PROJECT_BINARY_DIR}/CpuFeaturesNdkCompatConfigVersion.cmake"
+  COMPATIBILITY SameMajorVersion
+)
+install(
+  FILES
+    "${PROJECT_BINARY_DIR}/CpuFeaturesNdkCompatConfig.cmake"
+    "${PROJECT_BINARY_DIR}/CpuFeaturesNdkCompatConfigVersion.cmake"
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeaturesNdkCompat"
+  COMPONENT Devel
+)
+
+#
+# program : NDK compat test program
+#
+if(ENABLE_TESTING)
+  add_executable(ndk-compat-test ndk-compat-test.c)
+  target_link_libraries(ndk-compat-test PRIVATE ndk_compat)
+endif()

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/ndk_compat/README.md

@@ -0,0 +1,16 @@
+<!-- prettier-ignore-start -->
+[comment]: # (
+SPDX-License-Identifier: BSD-2-Clause
+)
+
+[comment]: # (
+SPDX-FileCopyrightText: 2010 The Android Open Source Project
+)
+<!-- prettier-ignore-end -->
+
+Provides a header compatible with
+[android's NDK cpu-features.h](https://android.googlesource.com/platform/ndk/+/master/sources/android/cpufeatures/cpu-features.h).
+
+It is intended to be a drop in replacement for this header and help users
+transition from the NDK to
+[Google's cpu_features library](https://github.com/google/cpu_features).

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/ndk_compat/cpu-features.c

@@ -0,0 +1,231 @@
+/*
+ * SPDX-FileCopyrightText: 2010 The Android Open Source Project
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "cpu-features.h"
+#include "cpu_features_macros.h"
+#include "internal/filesystem.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+#include <pthread.h>
+
+#if defined(CPU_FEATURES_ARCH_ARM)
+#include "cpuinfo_arm.h"
+#elif defined(CPU_FEATURES_ARCH_X86)
+#include "cpuinfo_x86.h"
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+#include "cpuinfo_mips.h"
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+#include "cpuinfo_aarch64.h"
+#endif
+
+static pthread_once_t g_once;
+static int g_inited;
+static uint64_t g_cpuFeatures;
+static int g_cpuCount;
+
+#ifdef CPU_FEATURES_ARCH_ARM
+static uint32_t g_cpuIdArm;
+#endif
+
+static void set_cpu_mask_bit(uint32_t index, uint32_t* cpu_mask)
+{
+    *cpu_mask |= 1UL << index;
+}
+
+// Examples of valid inputs: "31", "4-31"
+static void parse_cpu_mask(const StringView text, uint32_t* cpu_mask)
+{
+    int separator_index = CpuFeatures_StringView_IndexOfChar(text, '-');
+    if (separator_index < 0)
+        {  // A single cpu index
+            int cpu_index = CpuFeatures_StringView_ParsePositiveNumber(text);
+            if (cpu_index < 0) return;
+            set_cpu_mask_bit(cpu_index, cpu_mask);
+        }
+    else
+        {
+            int cpu_index_a = CpuFeatures_StringView_ParsePositiveNumber(
+                CpuFeatures_StringView_KeepFront(text, separator_index));
+            int cpu_index_b = CpuFeatures_StringView_ParsePositiveNumber(
+                CpuFeatures_StringView_PopFront(text, separator_index + 1));
+            int i;
+            if (cpu_index_a < 0 || cpu_index_b < 0) return;
+            for (i = cpu_index_a; i <= cpu_index_b; ++i)
+                {
+                    if (i < 32)
+                        {
+                            set_cpu_mask_bit(i, cpu_mask);
+                        }
+                }
+        }
+}
+
+// Format specification from
+// https://www.kernel.org/doc/Documentation/cputopology.txt
+// Examples of valid inputs: "31", "2,4-31,32-63", "0-1,3"
+static void parse_cpu_mask_line(const LineResult result, uint32_t* cpu_mask)
+{
+    if (!result.full_line || result.eof) return;
+    StringView line = result.line;
+    for (; line.size > 0;)
+        {
+            int next_entry_index = CpuFeatures_StringView_IndexOfChar(line, ',');
+            if (next_entry_index < 0)
+                {
+                    parse_cpu_mask(line, cpu_mask);
+                    break;
+                }
+            StringView entry = CpuFeatures_StringView_KeepFront(line, next_entry_index);
+            parse_cpu_mask(entry, cpu_mask);
+            line = CpuFeatures_StringView_PopFront(line, next_entry_index + 1);
+        }
+}
+
+static void update_cpu_mask_from_file(const char* filename,
+    uint32_t* cpu_mask)
+{
+    const int fd = CpuFeatures_OpenFile(filename);
+    if (fd >= 0)
+        {
+            StackLineReader reader;
+            StackLineReader_Initialize(&reader, fd);
+            parse_cpu_mask_line(StackLineReader_NextLine(&reader), cpu_mask);
+            CpuFeatures_CloseFile(fd);
+        }
+}
+
+static int get_cpu_count(void)
+{
+    uint32_t cpu_mask = 0;
+    update_cpu_mask_from_file("/sys/devices/system/cpu/present", &cpu_mask);
+    update_cpu_mask_from_file("/sys/devices/system/cpu/possible", &cpu_mask);
+    return __builtin_popcount(cpu_mask);
+}
+
+static void android_cpuInit(void)
+{
+    g_cpuFeatures = 0;
+    g_cpuCount = 1;
+    g_inited = 1;
+
+    g_cpuCount = get_cpu_count();
+    if (g_cpuCount == 0)
+        {
+            g_cpuCount = 1;
+        }
+#if defined(CPU_FEATURES_ARCH_ARM)
+    ArmInfo info = GetArmInfo();
+    if (info.architecture == 7) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_ARMv7;
+    if (info.features.vfpv3) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3;
+    if (info.features.neon)
+        {
+            g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON;
+            g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_D32;
+        }
+    if (info.features.vfpv3d16) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_FP16;
+    if (info.features.idiva) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_IDIV_ARM;
+    if (info.features.idivt) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_IDIV_THUMB2;
+    if (info.features.iwmmxt) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_iWMMXt;
+    if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_AES;
+    if (info.features.pmull) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_PMULL;
+    if (info.features.sha1) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_SHA1;
+    if (info.features.sha2) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_SHA2;
+    if (info.features.crc32) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_CRC32;
+    if (info.architecture >= 6)
+        g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_LDREX_STREX;
+    if (info.features.vfp) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv2;
+    if (info.features.vfpv4)
+        {
+            g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_FMA;
+            g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON_FMA;
+        }
+    g_cpuIdArm = GetArmCpuId(&info);
+#elif defined(CPU_FEATURES_ARCH_X86)
+    X86Info info = GetX86Info();
+    if (info.features.ssse3) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSSE3;
+    if (info.features.popcnt) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_POPCNT;
+    if (info.features.movbe) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_MOVBE;
+    if (info.features.sse4_1) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSE4_1;
+    if (info.features.sse4_2) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSE4_2;
+    if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AES_NI;
+    if (info.features.avx) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AVX;
+    if (info.features.rdrnd) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_RDRAND;
+    if (info.features.avx2) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AVX2;
+    if (info.features.sha) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SHA_NI;
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+    MipsInfo info = GetMipsInfo();
+    if (info.features.r6) g_cpuFeatures |= ANDROID_CPU_MIPS_FEATURE_R6;
+    if (info.features.msa) g_cpuFeatures |= ANDROID_CPU_MIPS_FEATURE_MSA;
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+    Aarch64Info info = GetAarch64Info();
+    if (info.features.fp) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_FP;
+    if (info.features.asimd) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_ASIMD;
+    if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_AES;
+    if (info.features.pmull) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_PMULL;
+    if (info.features.sha1) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_SHA1;
+    if (info.features.sha2) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_SHA2;
+    if (info.features.crc32) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_CRC32;
+#endif
+}
+
+AndroidCpuFamily android_getCpuFamily(void)
+{
+#if defined(CPU_FEATURES_ARCH_ARM)
+    return ANDROID_CPU_FAMILY_ARM;
+#elif defined(CPU_FEATURES_ARCH_X86_32)
+    return ANDROID_CPU_FAMILY_X86;
+#elif defined(CPU_FEATURES_ARCH_MIPS64)
+    return ANDROID_CPU_FAMILY_MIPS64;
+#elif defined(CPU_FEATURES_ARCH_MIPS32)
+    return ANDROID_CPU_FAMILY_MIPS;
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+    return ANDROID_CPU_FAMILY_ARM64;
+#elif defined(CPU_FEATURES_ARCH_X86_64)
+    return ANDROID_CPU_FAMILY_X86_64;
+#else
+    return ANDROID_CPU_FAMILY_UNKNOWN;
+#endif
+}
+
+uint64_t android_getCpuFeatures(void)
+{
+    pthread_once(&g_once, android_cpuInit);
+    return g_cpuFeatures;
+}
+
+int android_getCpuCount(void)
+{
+    pthread_once(&g_once, android_cpuInit);
+    return g_cpuCount;
+}
+
+static void android_cpuInitDummy(void) { g_inited = 1; }
+
+int android_setCpu(int cpu_count, uint64_t cpu_features)
+{
+    /* Fail if the library was already initialized. */
+    if (g_inited) return 0;
+    g_cpuCount = (cpu_count <= 0 ? 1 : cpu_count);
+    g_cpuFeatures = cpu_features;
+    pthread_once(&g_once, android_cpuInitDummy);
+    return 1;
+}
+
+#ifdef CPU_FEATURES_ARCH_ARM
+
+uint32_t android_getCpuIdArm(void)
+{
+    pthread_once(&g_once, android_cpuInit);
+    return g_cpuIdArm;
+}
+
+int android_setCpuArm(int cpu_count, uint64_t cpu_features, uint32_t cpu_id)
+{
+    if (!android_setCpu(cpu_count, cpu_features)) return 0;
+    g_cpuIdArm = cpu_id;
+    return 1;
+}
+
+#endif  // CPU_FEATURES_ARCH_ARM

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/ndk_compat/cpu-features.h

@@ -0,0 +1,303 @@
+/*
+ * SPDX-FileCopyrightText: 2010 The Android Open Source Project
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef GOOGLE_CPU_FEATURES_H
+#define GOOGLE_CPU_FEATURES_H
+#include <stdint.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* A list of valid values returned by android_getCpuFamily().
+ * They describe the CPU Architecture of the current process.
+ */
+typedef enum
+{
+    ANDROID_CPU_FAMILY_UNKNOWN = 0,
+    ANDROID_CPU_FAMILY_ARM,
+    ANDROID_CPU_FAMILY_X86,
+    ANDROID_CPU_FAMILY_MIPS,
+    ANDROID_CPU_FAMILY_ARM64,
+    ANDROID_CPU_FAMILY_X86_64,
+    ANDROID_CPU_FAMILY_MIPS64,
+    ANDROID_CPU_FAMILY_MAX /* do not remove */
+} AndroidCpuFamily;
+
+/* Return the CPU family of the current process.
+ *
+ * Note that this matches the bitness of the current process. I.e. when
+ * running a 32-bit binary on a 64-bit capable CPU, this will return the
+ * 32-bit CPU family value.
+ */
+extern AndroidCpuFamily android_getCpuFamily(void);
+
+/* Return a bitmap describing a set of optional CPU features that are
+ * supported by the current device's CPU. The exact bit-flags returned
+ * depend on the value returned by android_getCpuFamily(). See the
+ * documentation for the ANDROID_CPU_*_FEATURE_* flags below for details.
+ */
+extern uint64_t android_getCpuFeatures(void);
+
+/* The list of feature flags for ANDROID_CPU_FAMILY_ARM that can be
+ * recognized by the library (see note below for 64-bit ARM). Value details
+ * are:
+ *
+ *   VFPv2:
+ *     CPU supports the VFPv2 instruction set. Many, but not all, ARMv6 CPUs
+ *     support these instructions. VFPv2 is a subset of VFPv3 so this will
+ *     be set whenever VFPv3 is set too.
+ *
+ *   ARMv7:
+ *     CPU supports the ARMv7-A basic instruction set.
+ *     This feature is mandated by the 'armeabi-v7a' ABI.
+ *
+ *   VFPv3:
+ *     CPU supports the VFPv3-D16 instruction set, providing hardware FPU
+ *     support for single and double precision floating point registers.
+ *     Note that only 16 FPU registers are available by default, unless
+ *     the D32 bit is set too. This feature is also mandated by the
+ *     'armeabi-v7a' ABI.
+ *
+ *   VFP_D32:
+ *     CPU VFP optional extension that provides 32 FPU registers,
+ *     instead of 16. Note that ARM mandates this feature is the 'NEON'
+ *     feature is implemented by the CPU.
+ *
+ *   NEON:
+ *     CPU FPU supports "ARM Advanced SIMD" instructions, also known as
+ *     NEON. Note that this mandates the VFP_D32 feature as well, per the
+ *     ARM Architecture specification.
+ *
+ *   VFP_FP16:
+ *     Half-width floating precision VFP extension. If set, the CPU
+ *     supports instructions to perform floating-point operations on
+ *     16-bit registers. This is part of the VFPv4 specification, but
+ *     not mandated by any Android ABI.
+ *
+ *   VFP_FMA:
+ *     Fused multiply-accumulate VFP instructions extension. Also part of
+ *     the VFPv4 specification, but not mandated by any Android ABI.
+ *
+ *   NEON_FMA:
+ *     Fused multiply-accumulate NEON instructions extension. Optional
+ *     extension from the VFPv4 specification, but not mandated by any
+ *     Android ABI.
+ *
+ *   IDIV_ARM:
+ *     Integer division available in ARM mode. Only available
+ *     on recent CPUs (e.g. Cortex-A15).
+ *
+ *   IDIV_THUMB2:
+ *     Integer division available in Thumb-2 mode. Only available
+ *     on recent CPUs (e.g. Cortex-A15).
+ *
+ *   iWMMXt:
+ *     Optional extension that adds MMX registers and operations to an
+ *     ARM CPU. This is only available on a few XScale-based CPU designs
+ *     sold by Marvell. Pretty rare in practice.
+ *
+ *   AES:
+ *     CPU supports AES instructions. These instructions are only
+ *     available for 32-bit applications running on ARMv8 CPU.
+ *
+ *   CRC32:
+ *     CPU supports CRC32 instructions. These instructions are only
+ *     available for 32-bit applications running on ARMv8 CPU.
+ *
+ *   SHA2:
+ *     CPU supports SHA2 instructions. These instructions are only
+ *     available for 32-bit applications running on ARMv8 CPU.
+ *
+ *   SHA1:
+ *     CPU supports SHA1 instructions. These instructions are only
+ *     available for 32-bit applications running on ARMv8 CPU.
+ *
+ *   PMULL:
+ *     CPU supports 64-bit PMULL and PMULL2 instructions. These
+ *     instructions are only available for 32-bit applications
+ *     running on ARMv8 CPU.
+ *
+ * If you want to tell the compiler to generate code that targets one of
+ * the feature set above, you should probably use one of the following
+ * flags (for more details, see technical note at the end of this file):
+ *
+ *   -mfpu=vfp
+ *   -mfpu=vfpv2
+ *     These are equivalent and tell GCC to use VFPv2 instructions for
+ *     floating-point operations. Use this if you want your code to
+ *     run on *some* ARMv6 devices, and any ARMv7-A device supported
+ *     by Android.
+ *
+ *     Generated code requires VFPv2 feature.
+ *
+ *   -mfpu=vfpv3-d16
+ *     Tell GCC to use VFPv3 instructions (using only 16 FPU registers).
+ *     This should be generic code that runs on any CPU that supports the
+ *     'armeabi-v7a' Android ABI. Note that no ARMv6 CPU supports this.
+ *
+ *     Generated code requires VFPv3 feature.
+ *
+ *   -mfpu=vfpv3
+ *     Tell GCC to use VFPv3 instructions with 32 FPU registers.
+ *     Generated code requires VFPv3|VFP_D32 features.
+ *
+ *   -mfpu=neon
+ *     Tell GCC to use VFPv3 instructions with 32 FPU registers, and
+ *     also support NEON intrinsics (see <arm_neon.h>).
+ *     Generated code requires VFPv3|VFP_D32|NEON features.
+ *
+ *   -mfpu=vfpv4-d16
+ *     Generated code requires VFPv3|VFP_FP16|VFP_FMA features.
+ *
+ *   -mfpu=vfpv4
+ *     Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32 features.
+ *
+ *   -mfpu=neon-vfpv4
+ *     Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32|NEON|NEON_FMA
+ *     features.
+ *
+ *   -mcpu=cortex-a7
+ *   -mcpu=cortex-a15
+ *     Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32|
+ *                             NEON|NEON_FMA|IDIV_ARM|IDIV_THUMB2
+ *     This flag implies -mfpu=neon-vfpv4.
+ *
+ *   -mcpu=iwmmxt
+ *     Allows the use of iWMMXt instrinsics with GCC.
+ *
+ * IMPORTANT NOTE: These flags should only be tested when
+ * android_getCpuFamily() returns ANDROID_CPU_FAMILY_ARM, i.e. this is a
+ * 32-bit process.
+ *
+ * When running a 64-bit ARM process on an ARMv8 CPU,
+ * android_getCpuFeatures() will return a different set of bitflags
+ */
+enum
+{
+    ANDROID_CPU_ARM_FEATURE_ARMv7 = (1 << 0),
+    ANDROID_CPU_ARM_FEATURE_VFPv3 = (1 << 1),
+    ANDROID_CPU_ARM_FEATURE_NEON = (1 << 2),
+    ANDROID_CPU_ARM_FEATURE_LDREX_STREX = (1 << 3),
+    ANDROID_CPU_ARM_FEATURE_VFPv2 = (1 << 4),
+    ANDROID_CPU_ARM_FEATURE_VFP_D32 = (1 << 5),
+    ANDROID_CPU_ARM_FEATURE_VFP_FP16 = (1 << 6),
+    ANDROID_CPU_ARM_FEATURE_VFP_FMA = (1 << 7),
+    ANDROID_CPU_ARM_FEATURE_NEON_FMA = (1 << 8),
+    ANDROID_CPU_ARM_FEATURE_IDIV_ARM = (1 << 9),
+    ANDROID_CPU_ARM_FEATURE_IDIV_THUMB2 = (1 << 10),
+    ANDROID_CPU_ARM_FEATURE_iWMMXt = (1 << 11),
+    ANDROID_CPU_ARM_FEATURE_AES = (1 << 12),
+    ANDROID_CPU_ARM_FEATURE_PMULL = (1 << 13),
+    ANDROID_CPU_ARM_FEATURE_SHA1 = (1 << 14),
+    ANDROID_CPU_ARM_FEATURE_SHA2 = (1 << 15),
+    ANDROID_CPU_ARM_FEATURE_CRC32 = (1 << 16),
+};
+
+/* The bit flags corresponding to the output of android_getCpuFeatures()
+ * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_ARM64. Value details
+ * are:
+ *
+ *   FP:
+ *     CPU has Floating-point unit.
+ *
+ *   ASIMD:
+ *     CPU has Advanced SIMD unit.
+ *
+ *   AES:
+ *     CPU supports AES instructions.
+ *
+ *   CRC32:
+ *     CPU supports CRC32 instructions.
+ *
+ *   SHA2:
+ *     CPU supports SHA2 instructions.
+ *
+ *   SHA1:
+ *     CPU supports SHA1 instructions.
+ *
+ *   PMULL:
+ *     CPU supports 64-bit PMULL and PMULL2 instructions.
+ */
+enum
+{
+    ANDROID_CPU_ARM64_FEATURE_FP = (1 << 0),
+    ANDROID_CPU_ARM64_FEATURE_ASIMD = (1 << 1),
+    ANDROID_CPU_ARM64_FEATURE_AES = (1 << 2),
+    ANDROID_CPU_ARM64_FEATURE_PMULL = (1 << 3),
+    ANDROID_CPU_ARM64_FEATURE_SHA1 = (1 << 4),
+    ANDROID_CPU_ARM64_FEATURE_SHA2 = (1 << 5),
+    ANDROID_CPU_ARM64_FEATURE_CRC32 = (1 << 6),
+};
+
+/* The bit flags corresponding to the output of android_getCpuFeatures()
+ * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_X86 or
+ * ANDROID_CPU_FAMILY_X86_64.
+ */
+enum
+{
+    ANDROID_CPU_X86_FEATURE_SSSE3 = (1 << 0),
+    ANDROID_CPU_X86_FEATURE_POPCNT = (1 << 1),
+    ANDROID_CPU_X86_FEATURE_MOVBE = (1 << 2),
+    ANDROID_CPU_X86_FEATURE_SSE4_1 = (1 << 3),
+    ANDROID_CPU_X86_FEATURE_SSE4_2 = (1 << 4),
+    ANDROID_CPU_X86_FEATURE_AES_NI = (1 << 5),
+    ANDROID_CPU_X86_FEATURE_AVX = (1 << 6),
+    ANDROID_CPU_X86_FEATURE_RDRAND = (1 << 7),
+    ANDROID_CPU_X86_FEATURE_AVX2 = (1 << 8),
+    ANDROID_CPU_X86_FEATURE_SHA_NI = (1 << 9),
+};
+
+/* The bit flags corresponding to the output of android_getCpuFeatures()
+ * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_MIPS
+ * or ANDROID_CPU_FAMILY_MIPS64.  Values are:
+ *
+ *   R6:
+ *     CPU executes MIPS Release 6 instructions natively, and
+ *     supports obsoleted R1..R5 instructions only via kernel traps.
+ *
+ *   MSA:
+ *     CPU supports Mips SIMD Architecture instructions.
+ */
+enum
+{
+    ANDROID_CPU_MIPS_FEATURE_R6 = (1 << 0),
+    ANDROID_CPU_MIPS_FEATURE_MSA = (1 << 1),
+};
+
+/* Return the number of CPU cores detected on this device.
+ * Please note the current implementation supports up to 32 cpus.
+ */
+extern int android_getCpuCount(void);
+
+/* The following is used to force the CPU count and features
+ * mask in sandboxed processes. Under 4.1 and higher, these processes
+ * cannot access /proc, which is the only way to get information from
+ * the kernel about the current hardware (at least on ARM).
+ *
+ * It _must_ be called only once, and before any android_getCpuXXX
+ * function, any other case will fail.
+ *
+ * This function return 1 on success, and 0 on failure.
+ */
+extern int android_setCpu(int cpu_count, uint64_t cpu_features);
+
+#ifdef __arm__
+
+/* Retrieve the ARM 32-bit CPUID value from the kernel.
+ * Note that this cannot work on sandboxed processes under 4.1 and
+ * higher, unless you called android_setCpuArm() before.
+ */
+extern uint32_t android_getCpuIdArm(void);
+
+/* An ARM-specific variant of android_setCpu() that also allows you
+ * to set the ARM CPUID field.
+ */
+extern int android_setCpuArm(int cpu_count, uint64_t cpu_features,
+    uint32_t cpu_id);
+
+#endif
+
+__END_DECLS
+#endif /* GOOGLE_CPU_FEATURES_H */

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/ndk_compat/ndk-compat-test.c

@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: 2010 The Android Open Source Project
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "cpu-features.h"
+#include <stdio.h>
+
+int main()
+{
+    printf("android_getCpuFamily()=%d\n", android_getCpuFamily());
+    printf("android_getCpuFeatures()=0x%08llx\n", android_getCpuFeatures());
+    printf("android_getCpuCount()=%d\n", android_getCpuCount());
+#ifdef __arm__
+    printf("android_getCpuIdArm()=0x%04x\n", android_getCpuIdArm());
+#endif  //__arm__
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/scripts/run_integration.sh

@@ -0,0 +1,212 @@
+#!/usr/bin/env bash
+
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+readonly SCRIPT_FOLDER=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+readonly PROJECT_FOLDER="${SCRIPT_FOLDER}/.."
+readonly ARCHIVE_FOLDER=~/cpu_features_archives
+readonly QEMU_INSTALL=${ARCHIVE_FOLDER}/qemu
+readonly DEFAULT_CMAKE_ARGS=" -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=ON"
+
+function extract() {
+  case $1 in
+    *.tar.bz2)   tar xjf "$1"    ;;
+    *.tar.xz)    tar xJf "$1"    ;;
+    *.tar.gz)    tar xzf "$1"    ;;
+    *)
+      echo "don't know how to extract '$1'..."
+      exit 1
+  esac
+}
+
+function unpackifnotexists() {
+  mkdir -p "${ARCHIVE_FOLDER}"
+  cd "${ARCHIVE_FOLDER}" || exit
+  local URL=$1
+  local RELATIVE_FOLDER=$2
+  local DESTINATION="${ARCHIVE_FOLDER}/${RELATIVE_FOLDER}"
+  if [[  ! -d "${DESTINATION}" ]] ; then
+    local ARCHIVE_NAME=$(echo ${URL} | sed 's/.*\///')
+    test -f "${ARCHIVE_NAME}" || wget -q "${URL}"
+    extract "${ARCHIVE_NAME}"
+    rm -f "${ARCHIVE_NAME}"
+  fi
+}
+
+function installqemuifneeded() {
+  local VERSION=${QEMU_VERSION:=2.11.1}
+  local ARCHES=${QEMU_ARCHES:=arm aarch64 i386 x86_64 mips mipsel mips64 mips64el}
+  local TARGETS=${QEMU_TARGETS:=$(echo "$ARCHES" | sed 's#$# #;s#\([^ ]*\) #\1-linux-user #g')}
+
+  if echo "${VERSION} ${TARGETS}" | cmp --silent ${QEMU_INSTALL}/.build -; then
+    echo "qemu ${VERSION} up to date!"
+    return 0
+  fi
+
+  echo "VERSION: ${VERSION}"
+  echo "TARGETS: ${TARGETS}"
+
+  rm -rf ${QEMU_INSTALL}
+
+  # Checking for a tarball before downloading makes testing easier :-)
+  local QEMU_URL="http://wiki.qemu-project.org/download/qemu-${VERSION}.tar.xz"
+  local QEMU_FOLDER="qemu-${VERSION}"
+  unpackifnotexists ${QEMU_URL} ${QEMU_FOLDER}
+  cd ${QEMU_FOLDER} || exit
+
+  ./configure \
+    --prefix="${QEMU_INSTALL}" \
+    --target-list="${TARGETS}" \
+    --disable-docs \
+    --disable-sdl \
+    --disable-gtk \
+    --disable-gnutls \
+    --disable-gcrypt \
+    --disable-nettle \
+    --disable-curses \
+    --static
+
+  make -j4
+  make install
+
+  echo "$VERSION $TARGETS" > ${QEMU_INSTALL}/.build
+}
+
+function assert_defined(){
+  local VALUE=${1}
+  : "${VALUE?"${1} needs to be defined"}"
+}
+
+function integrate() {
+  cd "${PROJECT_FOLDER}"
+  case "${OS}" in
+   "Windows_NT") CMAKE_BUILD_ARGS="--config Debug --target ALL_BUILD"
+                 CMAKE_TEST_FILES="${BUILD_DIR}/test/Debug/*_test.exe"
+                 DEMO=${BUILD_DIR}/Debug/list_cpu_features.exe
+                 ;;
+   *)            CMAKE_BUILD_ARGS="--target all"
+                 CMAKE_TEST_FILES="${BUILD_DIR}/test/*_test"
+                 DEMO=${BUILD_DIR}/list_cpu_features
+                 ;;
+  esac
+
+  # Generating CMake configuration
+  cmake -H. -B"${BUILD_DIR}" ${DEFAULT_CMAKE_ARGS} "${CMAKE_ADDITIONAL_ARGS[@]}" -G"${CMAKE_GENERATOR:-Unix Makefiles}"
+
+  # Building
+  cmake --build "${BUILD_DIR}" ${CMAKE_BUILD_ARGS}
+
+  # Running tests if needed
+  if [[ "${QEMU_ARCH}" == "DISABLED" ]]; then
+    return
+  fi
+  RUN_CMD=""
+  if [[ -n "${QEMU_ARCH}" ]]; then
+    installqemuifneeded
+    RUN_CMD="${QEMU_INSTALL}/bin/qemu-${QEMU_ARCH} ${QEMU_ARGS[@]}"
+  fi
+  for test_binary in ${CMAKE_TEST_FILES}; do
+    ${RUN_CMD} ${test_binary}
+  done
+  ${RUN_CMD} ${DEMO}
+}
+
+function expand_linaro_config() {
+  assert_defined TARGET
+  local LINARO_ROOT_URL=https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11
+
+  local GCC_URL=${LINARO_ROOT_URL}/${TARGET}/gcc-linaro-7.2.1-2017.11-x86_64_${TARGET}.tar.xz
+  local GCC_RELATIVE_FOLDER="gcc-linaro-7.2.1-2017.11-x86_64_${TARGET}"
+  unpackifnotexists "${GCC_URL}" "${GCC_RELATIVE_FOLDER}"
+
+  local SYSROOT_URL=${LINARO_ROOT_URL}/${TARGET}/sysroot-glibc-linaro-2.25-2017.11-${TARGET}.tar.xz
+  local SYSROOT_RELATIVE_FOLDER=sysroot-glibc-linaro-2.25-2017.11-${TARGET}
+  unpackifnotexists "${SYSROOT_URL}" "${SYSROOT_RELATIVE_FOLDER}"
+
+  local SYSROOT_FOLDER=${ARCHIVE_FOLDER}/${SYSROOT_RELATIVE_FOLDER}
+  local GCC_FOLDER=${ARCHIVE_FOLDER}/${GCC_RELATIVE_FOLDER}
+
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_SYSTEM_NAME=Linux)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_SYSTEM_PROCESSOR=${TARGET})
+
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_SYSROOT=${SYSROOT_FOLDER})
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_C_COMPILER=${GCC_FOLDER}/bin/${TARGET}-gcc)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_CXX_COMPILER=${GCC_FOLDER}/bin/${TARGET}-g++)
+
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY)
+
+  QEMU_ARGS+=(-L ${SYSROOT_FOLDER})
+  QEMU_ARGS+=(-E LD_LIBRARY_PATH=/lib)
+}
+
+function expand_codescape_config() {
+  assert_defined TARGET
+  local DATE=2017.10-08
+  local CODESCAPE_URL=https://codescape.mips.com/components/toolchain/${DATE}/Codescape.GNU.Tools.Package.${DATE}.for.MIPS.MTI.Linux.CentOS-5.x86_64.tar.gz
+  local GCC_URL=${CODESCAPE_URL}
+  local GCC_RELATIVE_FOLDER="mips-mti-linux-gnu/${DATE}"
+  unpackifnotexists "${GCC_URL}" "${GCC_RELATIVE_FOLDER}"
+
+  local GCC_FOLDER=${ARCHIVE_FOLDER}/${GCC_RELATIVE_FOLDER}
+  local MIPS_FLAGS=""
+  local LIBC_FOLDER_SUFFIX=""
+  local FLAVOUR=""
+  case "${TARGET}" in
+    "mips32")    MIPS_FLAGS="-EB -mabi=32"; FLAVOUR="mips-r2-hard"; LIBC_FOLDER_SUFFIX="lib" ;;
+    "mips32el")  MIPS_FLAGS="-EL -mabi=32"; FLAVOUR="mipsel-r2-hard"; LIBC_FOLDER_SUFFIX="lib" ;;
+    "mips64")    MIPS_FLAGS="-EB -mabi=64"; FLAVOUR="mips-r2-hard"; LIBC_FOLDER_SUFFIX="lib64" ;;
+    "mips64el")  MIPS_FLAGS="-EL -mabi=64"; FLAVOUR="mipsel-r2-hard"; LIBC_FOLDER_SUFFIX="lib64" ;;
+    *)           echo 'unknown mips platform'; exit 1;;
+  esac
+
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_FIND_ROOT_PATH=${GCC_FOLDER})
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_SYSTEM_NAME=Linux)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_SYSTEM_PROCESSOR=${TARGET})
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_C_COMPILER=mips-mti-linux-gnu-gcc)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_CXX_COMPILER=mips-mti-linux-gnu-g++)
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_C_COMPILER_ARG1="${MIPS_FLAGS}")
+  CMAKE_ADDITIONAL_ARGS+=(-DCMAKE_CXX_COMPILER_ARG1="${MIPS_FLAGS}")
+
+  local SYSROOT_FOLDER=${GCC_FOLDER}/sysroot/${FLAVOUR}
+
+  # Keeping only the sysroot of interest to save on travis cache.
+  if [[ "${CONTINUOUS_INTEGRATION}" = "true" ]]; then
+    for folder in ${GCC_FOLDER}/sysroot/*; do
+      if [[ "${folder}" != "${SYSROOT_FOLDER}" ]]; then
+        rm -rf ${folder}
+      fi
+    done
+  fi
+
+  local LIBC_FOLDER=${GCC_FOLDER}/mips-mti-linux-gnu/lib/${FLAVOUR}/${LIBC_FOLDER_SUFFIX}
+  QEMU_ARGS+=(-L ${SYSROOT_FOLDER})
+  QEMU_ARGS+=(-E LD_PRELOAD=${LIBC_FOLDER}/libstdc++.so.6:${LIBC_FOLDER}/libgcc_s.so.1)
+}
+
+function expand_environment_and_integrate() {
+  assert_defined PROJECT_FOLDER
+  assert_defined TARGET
+
+  BUILD_DIR="${PROJECT_FOLDER}/cmake_build/${TARGET}"
+  mkdir -p "${BUILD_DIR}"
+
+  declare -a CONFIG_NAMES=()
+  declare -a QEMU_ARGS=()
+  declare -a CMAKE_ADDITIONAL_ARGS=()
+
+  case ${TOOLCHAIN} in
+    LINARO)    expand_linaro_config     ;;
+    CODESCAPE) expand_codescape_config  ;;
+    NATIVE)    QEMU_ARCH=""             ;;
+    *)         echo "Unknown toolchain '${TOOLCHAIN}'..."; exit 1;;
+  esac
+  integrate
+}
+
+if [ "${CONTINUOUS_INTEGRATION}" = "true" ]; then
+  QEMU_ARCHES=${QEMU_ARCH}
+  expand_environment_and_integrate
+fi

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/scripts/test_integration.sh

@@ -0,0 +1,109 @@
+#!/usr/bin/env bash
+
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+source "$(dirname -- "$0")"/run_integration.sh
+
+# Toolchains for little-endian, 64-bit ARMv8 for GNU/Linux systems
+function set_aarch64-linux-gnu() {
+  TOOLCHAIN=LINARO
+  TARGET=aarch64-linux-gnu
+  QEMU_ARCH=aarch64
+}
+
+# Toolchains for little-endian, hard-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+function set_arm-linux-gnueabihf() {
+  TOOLCHAIN=LINARO
+  TARGET=arm-linux-gnueabihf
+  QEMU_ARCH=arm
+}
+
+# Toolchains for little-endian, 32-bit ARMv8 for GNU/Linux systems
+function set_armv8l-linux-gnueabihf() {
+  TOOLCHAIN=LINARO
+  TARGET=armv8l-linux-gnueabihf
+  QEMU_ARCH=arm
+}
+
+# Toolchains for little-endian, soft-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+function set_arm-linux-gnueabi() {
+  TOOLCHAIN=LINARO
+  TARGET=arm-linux-gnueabi
+  QEMU_ARCH=arm
+}
+
+# Toolchains for big-endian, 64-bit ARMv8 for GNU/Linux systems
+function set_aarch64_be-linux-gnu() {
+  TOOLCHAIN=LINARO
+  TARGET=aarch64_be-linux-gnu
+  QEMU_ARCH=DISABLED
+}
+
+# Toolchains for big-endian, hard-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+function set_armeb-linux-gnueabihf() {
+  TOOLCHAIN=LINARO
+  TARGET=armeb-linux-gnueabihf
+  QEMU_ARCH=DISABLED
+}
+
+# Toolchains for big-endian, soft-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+function set_armeb-linux-gnueabi() {
+  TOOLCHAIN=LINARO
+  TARGET=armeb-linux-gnueabi
+  QEMU_ARCH=DISABLED
+}
+
+function set_mips32() {
+  TOOLCHAIN=CODESCAPE
+  TARGET=mips32
+  QEMU_ARCH=mips
+}
+
+function set_mips32el() {
+  TOOLCHAIN=CODESCAPE
+  TARGET=mips32el
+  QEMU_ARCH=mipsel
+}
+
+function set_mips64() {
+  TOOLCHAIN=CODESCAPE
+  TARGET=mips64
+  QEMU_ARCH=mips64
+}
+
+function set_mips64el() {
+  TOOLCHAIN=CODESCAPE
+  TARGET=mips64el
+  QEMU_ARCH=mips64el
+}
+
+function set_native() {
+  TOOLCHAIN=NATIVE
+  TARGET=native
+  QEMU_ARCH=""
+}
+
+ENVIRONMENTS="
+  set_aarch64-linux-gnu
+  set_arm-linux-gnueabihf
+  set_armv8l-linux-gnueabihf
+  set_arm-linux-gnueabi
+  set_aarch64_be-linux-gnu
+  set_armeb-linux-gnueabihf
+  set_armeb-linux-gnueabi
+  set_mips32
+  set_mips32el
+  set_mips64
+  set_mips64el
+  set_native
+"
+
+set -e
+
+CMAKE_GENERATOR="Ninja"
+
+for SET_ENVIRONMENT in ${ENVIRONMENTS}; do
+  ${SET_ENVIRONMENT}
+  expand_environment_and_integrate
+done

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/cpuinfo_aarch64.c

@@ -0,0 +1,158 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_aarch64.h"
+#include "internal/filesystem.h"
+#include "internal/hwcaps.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+#include <assert.h>
+#include <ctype.h>
+
+// Generation of feature's getters/setters functions and kGetters, kSetters,
+// kCpuInfoFlags and kHardwareCapabilities global tables.
+#define DEFINE_TABLE_FEATURES                                                   \
+    FEATURE(AARCH64_FP, fp, "fp", AARCH64_HWCAP_FP, 0)                          \
+    FEATURE(AARCH64_ASIMD, asimd, "asimd", AARCH64_HWCAP_ASIMD, 0)              \
+    FEATURE(AARCH64_EVTSTRM, evtstrm, "evtstrm", AARCH64_HWCAP_EVTSTRM, 0)      \
+    FEATURE(AARCH64_AES, aes, "aes", AARCH64_HWCAP_AES, 0)                      \
+    FEATURE(AARCH64_PMULL, pmull, "pmull", AARCH64_HWCAP_PMULL, 0)              \
+    FEATURE(AARCH64_SHA1, sha1, "sha1", AARCH64_HWCAP_SHA1, 0)                  \
+    FEATURE(AARCH64_SHA2, sha2, "sha2", AARCH64_HWCAP_SHA2, 0)                  \
+    FEATURE(AARCH64_CRC32, crc32, "crc32", AARCH64_HWCAP_CRC32, 0)              \
+    FEATURE(AARCH64_ATOMICS, atomics, "atomics", AARCH64_HWCAP_ATOMICS, 0)      \
+    FEATURE(AARCH64_FPHP, fphp, "fphp", AARCH64_HWCAP_FPHP, 0)                  \
+    FEATURE(AARCH64_ASIMDHP, asimdhp, "asimdhp", AARCH64_HWCAP_ASIMDHP, 0)      \
+    FEATURE(AARCH64_CPUID, cpuid, "cpuid", AARCH64_HWCAP_CPUID, 0)              \
+    FEATURE(AARCH64_ASIMDRDM, asimdrdm, "asimdrdm", AARCH64_HWCAP_ASIMDRDM, 0)  \
+    FEATURE(AARCH64_JSCVT, jscvt, "jscvt", AARCH64_HWCAP_JSCVT, 0)              \
+    FEATURE(AARCH64_FCMA, fcma, "fcma", AARCH64_HWCAP_FCMA, 0)                  \
+    FEATURE(AARCH64_LRCPC, lrcpc, "lrcpc", AARCH64_HWCAP_LRCPC, 0)              \
+    FEATURE(AARCH64_DCPOP, dcpop, "dcpop", AARCH64_HWCAP_DCPOP, 0)              \
+    FEATURE(AARCH64_SHA3, sha3, "sha3", AARCH64_HWCAP_SHA3, 0)                  \
+    FEATURE(AARCH64_SM3, sm3, "sm3", AARCH64_HWCAP_SM3, 0)                      \
+    FEATURE(AARCH64_SM4, sm4, "sm4", AARCH64_HWCAP_SM4, 0)                      \
+    FEATURE(AARCH64_ASIMDDP, asimddp, "asimddp", AARCH64_HWCAP_ASIMDDP, 0)      \
+    FEATURE(AARCH64_SHA512, sha512, "sha512", AARCH64_HWCAP_SHA512, 0)          \
+    FEATURE(AARCH64_SVE, sve, "sve", AARCH64_HWCAP_SVE, 0)                      \
+    FEATURE(AARCH64_ASIMDFHM, asimdfhm, "asimdfhm", AARCH64_HWCAP_ASIMDFHM, 0)  \
+    FEATURE(AARCH64_DIT, dit, "dit", AARCH64_HWCAP_DIT, 0)                      \
+    FEATURE(AARCH64_USCAT, uscat, "uscat", AARCH64_HWCAP_USCAT, 0)              \
+    FEATURE(AARCH64_ILRCPC, ilrcpc, "ilrcpc", AARCH64_HWCAP_ILRCPC, 0)          \
+    FEATURE(AARCH64_FLAGM, flagm, "flagm", AARCH64_HWCAP_FLAGM, 0)              \
+    FEATURE(AARCH64_SSBS, ssbs, "ssbs", AARCH64_HWCAP_SSBS, 0)                  \
+    FEATURE(AARCH64_SB, sb, "sb", AARCH64_HWCAP_SB, 0)                          \
+    FEATURE(AARCH64_PACA, paca, "paca", AARCH64_HWCAP_PACA, 0)                  \
+    FEATURE(AARCH64_PACG, pacg, "pacg", AARCH64_HWCAP_PACG, 0)                  \
+    FEATURE(AARCH64_DCPODP, dcpodp, "dcpodp", 0, AARCH64_HWCAP2_DCPODP)         \
+    FEATURE(AARCH64_SVE2, sve2, "sve2", 0, AARCH64_HWCAP2_SVE2)                 \
+    FEATURE(AARCH64_SVEAES, sveaes, "sveaes", 0, AARCH64_HWCAP2_SVEAES)         \
+    FEATURE(AARCH64_SVEPMULL, svepmull, "svepmull", 0, AARCH64_HWCAP2_SVEPMULL) \
+    FEATURE(AARCH64_SVEBITPERM, svebitperm, "svebitperm", 0,                    \
+        AARCH64_HWCAP2_SVEBITPERM)                                              \
+    FEATURE(AARCH64_SVESHA3, svesha3, "svesha3", 0, AARCH64_HWCAP2_SVESHA3)     \
+    FEATURE(AARCH64_SVESM4, svesm4, "svesm4", 0, AARCH64_HWCAP2_SVESM4)         \
+    FEATURE(AARCH64_FLAGM2, flagm2, "flagm2", 0, AARCH64_HWCAP2_FLAGM2)         \
+    FEATURE(AARCH64_FRINT, frint, "frint", 0, AARCH64_HWCAP2_FRINT)             \
+    FEATURE(AARCH64_SVEI8MM, svei8mm, "svei8mm", 0, AARCH64_HWCAP2_SVEI8MM)     \
+    FEATURE(AARCH64_SVEF32MM, svef32mm, "svef32mm", 0, AARCH64_HWCAP2_SVEF32MM) \
+    FEATURE(AARCH64_SVEF64MM, svef64mm, "svef64mm", 0, AARCH64_HWCAP2_SVEF64MM) \
+    FEATURE(AARCH64_SVEBF16, svebf16, "svebf16", 0, AARCH64_HWCAP2_SVEBF16)     \
+    FEATURE(AARCH64_I8MM, i8mm, "i8mm", 0, AARCH64_HWCAP2_I8MM)                 \
+    FEATURE(AARCH64_BF16, bf16, "bf16", 0, AARCH64_HWCAP2_BF16)                 \
+    FEATURE(AARCH64_DGH, dgh, "dgh", 0, AARCH64_HWCAP2_DGH)                     \
+    FEATURE(AARCH64_RNG, rng, "rng", 0, AARCH64_HWCAP2_RNG)                     \
+    FEATURE(AARCH64_BTI, bti, "bti", 0, AARCH64_HWCAP2_BTI)
+#define DEFINE_TABLE_FEATURE_TYPE Aarch64Features
+#include "define_tables.h"
+
+static bool HandleAarch64Line(const LineResult result,
+    Aarch64Info* const info)
+{
+    StringView line = result.line;
+    StringView key, value;
+    if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value))
+        {
+            if (CpuFeatures_StringView_IsEquals(key, str("Features")))
+                {
+                    for (size_t i = 0; i < AARCH64_LAST_; ++i)
+                        {
+                            kSetters[i](&info->features,
+                                CpuFeatures_StringView_HasWord(value, kCpuInfoFlags[i]));
+                        }
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU implementer")))
+                {
+                    info->implementer = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU variant")))
+                {
+                    info->variant = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU part")))
+                {
+                    info->part = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU revision")))
+                {
+                    info->revision = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+        }
+    return !result.eof;
+}
+
+static void FillProcCpuInfoData(Aarch64Info* const info)
+{
+    const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
+    if (fd >= 0)
+        {
+            StackLineReader reader;
+            StackLineReader_Initialize(&reader, fd);
+            for (;;)
+                {
+                    if (!HandleAarch64Line(StackLineReader_NextLine(&reader), info))
+                        {
+                            break;
+                        }
+                }
+            CpuFeatures_CloseFile(fd);
+        }
+}
+
+static const Aarch64Info kEmptyAarch64Info;
+
+Aarch64Info GetAarch64Info(void)
+{
+    // capabilities are fetched from both getauxval and /proc/cpuinfo so we can
+    // have some information if the executable is sandboxed (aka no access to
+    // /proc/cpuinfo).
+    Aarch64Info info = kEmptyAarch64Info;
+
+    FillProcCpuInfoData(&info);
+    const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
+    for (size_t i = 0; i < AARCH64_LAST_; ++i)
+        {
+            if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps))
+                {
+                    kSetters[i](&info.features, true);
+                }
+        }
+
+    return info;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+int GetAarch64FeaturesEnumValue(const Aarch64Features* features,
+    Aarch64FeaturesEnum value)
+{
+    if (value >= AARCH64_LAST_) return false;
+    return kGetters[value](features);
+}
+
+const char* GetAarch64FeaturesEnumName(Aarch64FeaturesEnum value)
+{
+    if (value >= AARCH64_LAST_) return "unknown feature";
+    return kCpuInfoFlags[value];
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/cpuinfo_arm.c

@@ -0,0 +1,234 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_arm.h"
+#include "internal/bit_utils.h"
+#include "internal/filesystem.h"
+#include "internal/hwcaps.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+#include <assert.h>
+#include <ctype.h>
+
+// Generation of feature's getters/setters functions and kGetters, kSetters,
+// kCpuInfoFlags and kHardwareCapabilities global tables.
+#define DEFINE_TABLE_FEATURES                                           \
+    FEATURE(ARM_SWP, swp, "swp", ARM_HWCAP_SWP, 0)                      \
+    FEATURE(ARM_HALF, half, "half", ARM_HWCAP_HALF, 0)                  \
+    FEATURE(ARM_THUMB, thumb, "thumb", ARM_HWCAP_THUMB, 0)              \
+    FEATURE(ARM_26BIT, _26bit, "26bit", ARM_HWCAP_26BIT, 0)             \
+    FEATURE(ARM_FASTMULT, fastmult, "fastmult", ARM_HWCAP_FAST_MULT, 0) \
+    FEATURE(ARM_FPA, fpa, "fpa", ARM_HWCAP_FPA, 0)                      \
+    FEATURE(ARM_VFP, vfp, "vfp", ARM_HWCAP_VFP, 0)                      \
+    FEATURE(ARM_EDSP, edsp, "edsp", ARM_HWCAP_EDSP, 0)                  \
+    FEATURE(ARM_JAVA, java, "java", ARM_HWCAP_JAVA, 0)                  \
+    FEATURE(ARM_IWMMXT, iwmmxt, "iwmmxt", ARM_HWCAP_IWMMXT, 0)          \
+    FEATURE(ARM_CRUNCH, crunch, "crunch", ARM_HWCAP_CRUNCH, 0)          \
+    FEATURE(ARM_THUMBEE, thumbee, "thumbee", ARM_HWCAP_THUMBEE, 0)      \
+    FEATURE(ARM_NEON, neon, "neon", ARM_HWCAP_NEON, 0)                  \
+    FEATURE(ARM_VFPV3, vfpv3, "vfpv3", ARM_HWCAP_VFPV3, 0)              \
+    FEATURE(ARM_VFPV3D16, vfpv3d16, "vfpv3d16", ARM_HWCAP_VFPV3D16, 0)  \
+    FEATURE(ARM_TLS, tls, "tls", ARM_HWCAP_TLS, 0)                      \
+    FEATURE(ARM_VFPV4, vfpv4, "vfpv4", ARM_HWCAP_VFPV4, 0)              \
+    FEATURE(ARM_IDIVA, idiva, "idiva", ARM_HWCAP_IDIVA, 0)              \
+    FEATURE(ARM_IDIVT, idivt, "idivt", ARM_HWCAP_IDIVT, 0)              \
+    FEATURE(ARM_VFPD32, vfpd32, "vfpd32", ARM_HWCAP_VFPD32, 0)          \
+    FEATURE(ARM_LPAE, lpae, "lpae", ARM_HWCAP_LPAE, 0)                  \
+    FEATURE(ARM_EVTSTRM, evtstrm, "evtstrm", ARM_HWCAP_EVTSTRM, 0)      \
+    FEATURE(ARM_AES, aes, "aes", 0, ARM_HWCAP2_AES)                     \
+    FEATURE(ARM_PMULL, pmull, "pmull", 0, ARM_HWCAP2_PMULL)             \
+    FEATURE(ARM_SHA1, sha1, "sha1", 0, ARM_HWCAP2_SHA1)                 \
+    FEATURE(ARM_SHA2, sha2, "sha2", 0, ARM_HWCAP2_SHA2)                 \
+    FEATURE(ARM_CRC32, crc32, "crc32", 0, ARM_HWCAP2_CRC32)
+#define DEFINE_TABLE_FEATURE_TYPE ArmFeatures
+#include "define_tables.h"
+
+typedef struct
+{
+    bool processor_reports_armv6;
+    bool hardware_reports_goldfish;
+} ProcCpuInfoData;
+
+static int IndexOfNonDigit(StringView str)
+{
+    size_t index = 0;
+    while (str.size && isdigit(CpuFeatures_StringView_Front(str)))
+        {
+            str = CpuFeatures_StringView_PopFront(str, 1);
+            ++index;
+        }
+    return index;
+}
+
+static bool HandleArmLine(const LineResult result, ArmInfo* const info,
+    ProcCpuInfoData* const proc_info)
+{
+    StringView line = result.line;
+    StringView key, value;
+    if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value))
+        {
+            if (CpuFeatures_StringView_IsEquals(key, str("Features")))
+                {
+                    for (size_t i = 0; i < ARM_LAST_; ++i)
+                        {
+                            kSetters[i](&info->features,
+                                CpuFeatures_StringView_HasWord(value, kCpuInfoFlags[i]));
+                        }
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU implementer")))
+                {
+                    info->implementer = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU variant")))
+                {
+                    info->variant = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU part")))
+                {
+                    info->part = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU revision")))
+                {
+                    info->revision = CpuFeatures_StringView_ParsePositiveNumber(value);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("CPU architecture")))
+                {
+                    // CPU architecture is a number that may be followed by letters. e.g.
+                    // "6TEJ", "7".
+                    const StringView digits =
+                        CpuFeatures_StringView_KeepFront(value, IndexOfNonDigit(value));
+                    info->architecture = CpuFeatures_StringView_ParsePositiveNumber(digits);
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("Processor")) ||
+                     CpuFeatures_StringView_IsEquals(key, str("model name")))
+                {
+                    // Android reports this in a non-Linux standard "Processor" but sometimes
+                    // also in "model name", Linux reports it only in "model name"
+                    // see RaspberryPiZero (Linux) vs InvalidArmv7 (Android) test-cases
+                    proc_info->processor_reports_armv6 =
+                        CpuFeatures_StringView_IndexOf(value, str("(v6l)")) >= 0;
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("Hardware")))
+                {
+                    proc_info->hardware_reports_goldfish =
+                        CpuFeatures_StringView_IsEquals(value, str("Goldfish"));
+                }
+        }
+    return !result.eof;
+}
+
+uint32_t GetArmCpuId(const ArmInfo* const info)
+{
+    return (ExtractBitRange(info->implementer, 7, 0) << 24) |
+           (ExtractBitRange(info->variant, 3, 0) << 20) |
+           (ExtractBitRange(info->part, 11, 0) << 4) |
+           (ExtractBitRange(info->revision, 3, 0) << 0);
+}
+
+static void FixErrors(ArmInfo* const info,
+    ProcCpuInfoData* const proc_cpu_info_data)
+{
+    // Fixing Samsung kernel reporting invalid cpu architecture.
+    // http://code.google.com/p/android/issues/detail?id=10812
+    if (proc_cpu_info_data->processor_reports_armv6 && info->architecture >= 7)
+        {
+            info->architecture = 6;
+        }
+
+    // Handle kernel configuration bugs that prevent the correct reporting of CPU
+    // features.
+    switch (GetArmCpuId(info))
+        {
+        case 0x4100C080:
+            // Special case: The emulator-specific Android 4.2 kernel fails to report
+            // support for the 32-bit ARM IDIV instruction. Technically, this is a
+            // feature of the virtual CPU implemented by the emulator. Note that it
+            // could also support Thumb IDIV in the future, and this will have to be
+            // slightly updated.
+            if (info->architecture >= 7 &&
+                proc_cpu_info_data->hardware_reports_goldfish)
+                {
+                    info->features.idiva = true;
+                }
+            break;
+        case 0x511004D0:
+            // https://crbug.com/341598.
+            info->features.neon = false;
+            break;
+        case 0x510006F2:
+        case 0x510006F3:
+            // The Nexus 4 (Qualcomm Krait) kernel configuration forgets to report
+            // IDIV support.
+            info->features.idiva = true;
+            info->features.idivt = true;
+            break;
+        }
+
+    // Propagate cpu features.
+    if (info->features.vfpv4) info->features.vfpv3 = true;
+    if (info->features.neon) info->features.vfpv3 = true;
+    if (info->features.vfpv3) info->features.vfp = true;
+}
+
+static void FillProcCpuInfoData(ArmInfo* const info,
+    ProcCpuInfoData* proc_cpu_info_data)
+{
+    const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
+    if (fd >= 0)
+        {
+            StackLineReader reader;
+            StackLineReader_Initialize(&reader, fd);
+            for (;;)
+                {
+                    if (!HandleArmLine(StackLineReader_NextLine(&reader), info,
+                            proc_cpu_info_data))
+                        {
+                            break;
+                        }
+                }
+            CpuFeatures_CloseFile(fd);
+        }
+}
+
+static const ArmInfo kEmptyArmInfo;
+
+static const ProcCpuInfoData kEmptyProcCpuInfoData;
+
+ArmInfo GetArmInfo(void)
+{
+    // capabilities are fetched from both getauxval and /proc/cpuinfo so we can
+    // have some information if the executable is sandboxed (aka no access to
+    // /proc/cpuinfo).
+    ArmInfo info = kEmptyArmInfo;
+    ProcCpuInfoData proc_cpu_info_data = kEmptyProcCpuInfoData;
+
+    FillProcCpuInfoData(&info, &proc_cpu_info_data);
+    const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
+    for (size_t i = 0; i < ARM_LAST_; ++i)
+        {
+            if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps))
+                {
+                    kSetters[i](&info.features, true);
+                }
+        }
+
+    FixErrors(&info, &proc_cpu_info_data);
+
+    return info;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+int GetArmFeaturesEnumValue(const ArmFeatures* features,
+    ArmFeaturesEnum value)
+{
+    if (value >= ARM_LAST_) return false;
+    return kGetters[value](features);
+}
+
+const char* GetArmFeaturesEnumName(ArmFeaturesEnum value)
+{
+    if (value >= ARM_LAST_) return "unknown feature";
+    return kCpuInfoFlags[value];
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/cpuinfo_mips.c

@@ -0,0 +1,92 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_mips.h"
+#include "internal/filesystem.h"
+#include "internal/hwcaps.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+#include <assert.h>
+
+// Generation of feature's getters/setters functions and kGetters, kSetters,
+// kCpuInfoFlags and kHardwareCapabilities global tables.
+#define DEFINE_TABLE_FEATURES                        \
+    FEATURE(MIPS_MSA, msa, "msa", MIPS_HWCAP_MSA, 0) \
+    FEATURE(MIPS_EVA, eva, "eva", 0, 0)              \
+    FEATURE(MIPS_R6, r6, "r6", MIPS_HWCAP_R6, 0)
+#define DEFINE_TABLE_FEATURE_TYPE MipsFeatures
+#include "define_tables.h"
+
+static bool HandleMipsLine(const LineResult result,
+    MipsFeatures* const features)
+{
+    StringView key, value;
+    // See tests for an example.
+    if (CpuFeatures_StringView_GetAttributeKeyValue(result.line, &key, &value))
+        {
+            if (CpuFeatures_StringView_IsEquals(key, str("ASEs implemented")))
+                {
+                    for (size_t i = 0; i < MIPS_LAST_; ++i)
+                        {
+                            kSetters[i](features,
+                                CpuFeatures_StringView_HasWord(value, kCpuInfoFlags[i]));
+                        }
+                }
+        }
+    return !result.eof;
+}
+
+static void FillProcCpuInfoData(MipsFeatures* const features)
+{
+    const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
+    if (fd >= 0)
+        {
+            StackLineReader reader;
+            StackLineReader_Initialize(&reader, fd);
+            for (;;)
+                {
+                    if (!HandleMipsLine(StackLineReader_NextLine(&reader), features))
+                        {
+                            break;
+                        }
+                }
+            CpuFeatures_CloseFile(fd);
+        }
+}
+
+static const MipsInfo kEmptyMipsInfo;
+
+MipsInfo GetMipsInfo(void)
+{
+    // capabilities are fetched from both getauxval and /proc/cpuinfo so we can
+    // have some information if the executable is sandboxed (aka no access to
+    // /proc/cpuinfo).
+    MipsInfo info = kEmptyMipsInfo;
+
+    FillProcCpuInfoData(&info.features);
+    const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
+    for (size_t i = 0; i < MIPS_LAST_; ++i)
+        {
+            if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps))
+                {
+                    kSetters[i](&info.features, true);
+                }
+        }
+    return info;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+int GetMipsFeaturesEnumValue(const MipsFeatures* features,
+    MipsFeaturesEnum value)
+{
+    if (value >= MIPS_LAST_) return false;
+    return kGetters[value](features);
+}
+
+const char* GetMipsFeaturesEnumName(MipsFeaturesEnum value)
+{
+    if (value >= MIPS_LAST_) return "unknown feature";
+    return kCpuInfoFlags[value];
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/cpuinfo_ppc.c

@@ -0,0 +1,160 @@
+// SPDX-FileCopyrightText: 2018 IBM.
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_ppc.h"
+#include "internal/bit_utils.h"
+#include "internal/filesystem.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+#include <assert.h>
+#include <stdbool.h>
+#include <string.h>
+
+// Generation of feature's getters/setters functions and kGetters, kSetters,
+// kCpuInfoFlags and kHardwareCapabilities global tables.
+#define DEFINE_TABLE_FEATURES                                                    \
+    FEATURE(PPC_32, ppc32, "ppc32", PPC_FEATURE_32, 0)                           \
+    FEATURE(PPC_64, ppc64, "ppc64", PPC_FEATURE_64, 0)                           \
+    FEATURE(PPC_601_INSTR, ppc601, "ppc601", PPC_FEATURE_601_INSTR, 0)           \
+    FEATURE(PPC_HAS_ALTIVEC, altivec, "altivec", PPC_FEATURE_HAS_ALTIVEC, 0)     \
+    FEATURE(PPC_HAS_FPU, fpu, "fpu", PPC_FEATURE_HAS_FPU, 0)                     \
+    FEATURE(PPC_HAS_MMU, mmu, "mmu", PPC_FEATURE_HAS_MMU, 0)                     \
+    FEATURE(PPC_HAS_4xxMAC, mac_4xx, "4xxmac", PPC_FEATURE_HAS_4xxMAC, 0)        \
+    FEATURE(PPC_UNIFIED_CACHE, unifiedcache, "ucache",                           \
+        PPC_FEATURE_UNIFIED_CACHE, 0)                                            \
+    FEATURE(PPC_HAS_SPE, spe, "spe", PPC_FEATURE_HAS_SPE, 0)                     \
+    FEATURE(PPC_HAS_EFP_SINGLE, efpsingle, "efpsingle",                          \
+        PPC_FEATURE_HAS_EFP_SINGLE, 0)                                           \
+    FEATURE(PPC_HAS_EFP_DOUBLE, efpdouble, "efpdouble",                          \
+        PPC_FEATURE_HAS_EFP_DOUBLE, 0)                                           \
+    FEATURE(PPC_NO_TB, no_tb, "notb", PPC_FEATURE_NO_TB, 0)                      \
+    FEATURE(PPC_POWER4, power4, "power4", PPC_FEATURE_POWER4, 0)                 \
+    FEATURE(PPC_POWER5, power5, "power5", PPC_FEATURE_POWER5, 0)                 \
+    FEATURE(PPC_POWER5_PLUS, power5plus, "power5+", PPC_FEATURE_POWER5_PLUS, 0)  \
+    FEATURE(PPC_CELL, cell, "cellbe", PPC_FEATURE_CELL, 0)                       \
+    FEATURE(PPC_BOOKE, booke, "booke", PPC_FEATURE_BOOKE, 0)                     \
+    FEATURE(PPC_SMT, smt, "smt", PPC_FEATURE_SMT, 0)                             \
+    FEATURE(PPC_ICACHE_SNOOP, icachesnoop, "ic_snoop", PPC_FEATURE_ICACHE_SNOOP, \
+        0)                                                                       \
+    FEATURE(PPC_ARCH_2_05, arch205, "arch_2_05", PPC_FEATURE_ARCH_2_05, 0)       \
+    FEATURE(PPC_PA6T, pa6t, "pa6t", PPC_FEATURE_PA6T, 0)                         \
+    FEATURE(PPC_HAS_DFP, dfp, "dfp", PPC_FEATURE_HAS_DFP, 0)                     \
+    FEATURE(PPC_POWER6_EXT, power6ext, "power6x", PPC_FEATURE_POWER6_EXT, 0)     \
+    FEATURE(PPC_ARCH_2_06, arch206, "arch_2_06", PPC_FEATURE_ARCH_2_06, 0)       \
+    FEATURE(PPC_HAS_VSX, vsx, "vsx", PPC_FEATURE_HAS_VSX, 0)                     \
+    FEATURE(PPC_PSERIES_PERFMON_COMPAT, pseries_perfmon_compat, "archpmu",       \
+        PPC_FEATURE_PSERIES_PERFMON_COMPAT, 0)                                   \
+    FEATURE(PPC_TRUE_LE, truele, "true_le", PPC_FEATURE_TRUE_LE, 0)              \
+    FEATURE(PPC_PPC_LE, ppcle, "ppcle", PPC_FEATURE_PPC_LE, 0)                   \
+    FEATURE(PPC_ARCH_2_07, arch207, "arch_2_07", 0, PPC_FEATURE2_ARCH_2_07)      \
+    FEATURE(PPC_HTM, htm, "htm", 0, PPC_FEATURE2_HTM)                            \
+    FEATURE(PPC_DSCR, dscr, "dscr", 0, PPC_FEATURE2_DSCR)                        \
+    FEATURE(PPC_EBB, ebb, "ebb", 0, PPC_FEATURE2_EBB)                            \
+    FEATURE(PPC_ISEL, isel, "isel", 0, PPC_FEATURE2_ISEL)                        \
+    FEATURE(PPC_TAR, tar, "tar", 0, PPC_FEATURE2_TAR)                            \
+    FEATURE(PPC_VEC_CRYPTO, vcrypto, "vcrypto", 0, PPC_FEATURE2_VEC_CRYPTO)      \
+    FEATURE(PPC_HTM_NOSC, htm_nosc, "htm-nosc", 0, PPC_FEATURE2_HTM_NOSC)        \
+    FEATURE(PPC_ARCH_3_00, arch300, "arch_3_00", 0, PPC_FEATURE2_ARCH_3_00)      \
+    FEATURE(PPC_HAS_IEEE128, ieee128, "ieee128", 0, PPC_FEATURE2_HAS_IEEE128)    \
+    FEATURE(PPC_DARN, darn, "darn", 0, PPC_FEATURE2_DARN)                        \
+    FEATURE(PPC_SCV, scv, "scv", 0, PPC_FEATURE2_SCV)                            \
+    FEATURE(PPC_HTM_NO_SUSPEND, htm_no_suspend, "htm-no-suspend", 0,             \
+        PPC_FEATURE2_HTM_NO_SUSPEND)
+#define DEFINE_TABLE_FEATURE_TYPE PPCFeatures
+#include "define_tables.h"
+
+static bool HandlePPCLine(const LineResult result,
+    PPCPlatformStrings* const strings)
+{
+    StringView line = result.line;
+    StringView key, value;
+    if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value))
+        {
+            if (CpuFeatures_StringView_HasWord(key, "platform"))
+                {
+                    CpuFeatures_StringView_CopyString(value, strings->platform,
+                        sizeof(strings->platform));
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("model")))
+                {
+                    CpuFeatures_StringView_CopyString(value, strings->model,
+                        sizeof(strings->platform));
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("machine")))
+                {
+                    CpuFeatures_StringView_CopyString(value, strings->machine,
+                        sizeof(strings->platform));
+                }
+            else if (CpuFeatures_StringView_IsEquals(key, str("cpu")))
+                {
+                    CpuFeatures_StringView_CopyString(value, strings->cpu,
+                        sizeof(strings->platform));
+                }
+        }
+    return !result.eof;
+}
+
+static void FillProcCpuInfoData(PPCPlatformStrings* const strings)
+{
+    const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
+    if (fd >= 0)
+        {
+            StackLineReader reader;
+            StackLineReader_Initialize(&reader, fd);
+            for (;;)
+                {
+                    if (!HandlePPCLine(StackLineReader_NextLine(&reader), strings))
+                        {
+                            break;
+                        }
+                }
+            CpuFeatures_CloseFile(fd);
+        }
+}
+
+static const PPCInfo kEmptyPPCInfo;
+
+PPCInfo GetPPCInfo(void)
+{
+    /*
+   * On Power feature flags aren't currently in cpuinfo so we only look at
+   * the auxilary vector.
+   */
+    PPCInfo info = kEmptyPPCInfo;
+    const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
+    for (size_t i = 0; i < PPC_LAST_; ++i)
+        {
+            if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps))
+                {
+                    kSetters[i](&info.features, true);
+                }
+        }
+    return info;
+}
+
+static const PPCPlatformStrings kEmptyPPCPlatformStrings;
+
+PPCPlatformStrings GetPPCPlatformStrings(void)
+{
+    PPCPlatformStrings strings = kEmptyPPCPlatformStrings;
+
+    FillProcCpuInfoData(&strings);
+    strings.type = CpuFeatures_GetPlatformType();
+    return strings;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Introspection functions
+
+int GetPPCFeaturesEnumValue(const PPCFeatures* features,
+    PPCFeaturesEnum value)
+{
+    if (value >= PPC_LAST_) return false;
+    return kGetters[value](features);
+}
+
+const char* GetPPCFeaturesEnumName(PPCFeaturesEnum value)
+{
+    if (value >= PPC_LAST_) return "unknown feature";
+    return kCpuInfoFlags[value];
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/define_tables.h

@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+// The following preprocessor constants must be defined before including this
+// file:
+//  - DEFINE_TABLE_FEATURE_TYPE, the underlying type (e.g. X86Features)
+//  - DEFINE_TABLE_FEATURES, the list of FEATURE macros to be inserted.
+
+// This file is to be included once per `cpuinfo_XXX.c` in order to construct
+// feature getters and setters functions as well as several enum indexed tables
+// from the db file.
+// - `kGetters` a table of getters function pointers from feature enum to
+// retrieve a feature,
+// - `kSetters` a table of setters function pointers from feature enum to set a
+// feature,
+// - `kCpuInfoFlags` a table of strings from feature enum to /proc/cpuinfo
+// flags,
+// - `kHardwareCapabilities` a table of HardwareCapabilities structs indexed by
+// their feature enum.
+
+#ifndef SRC_DEFINE_TABLES_H_
+#define SRC_DEFINE_TABLES_H_
+
+#define FEATURE(ENUM, NAME, CPUINFO_FLAG, HWCAP, HWCAP2) [ENUM] = CPUINFO_FLAG,
+static const char* kCpuInfoFlags[] = {DEFINE_TABLE_FEATURES};
+#undef FEATURE
+
+#ifndef DEFINE_TABLE_DONT_GENERATE_HWCAPS
+#define FEATURE(ENUM, NAME, CPUINFO_FLAG, HWCAP, HWCAP2) \
+    [ENUM] = (HardwareCapabilities){HWCAP, HWCAP2},
+static const HardwareCapabilities kHardwareCapabilities[] = {
+    DEFINE_TABLE_FEATURES};
+#undef FEATURE
+#endif  // DEFINE_TABLE_DONT_GENERATE_HWCAPS
+
+#define FEATURE(ENUM, NAME, CPUINFO_FLAG, HWCAP, HWCAP2)                    \
+    static void set_##ENUM(DEFINE_TABLE_FEATURE_TYPE* features, bool value) \
+    {                                                                       \
+        features->NAME = value;                                             \
+    }                                                                       \
+    static int get_##ENUM(const DEFINE_TABLE_FEATURE_TYPE* features)        \
+    {                                                                       \
+        return features->NAME;                                              \
+    }
+DEFINE_TABLE_FEATURES
+#undef FEATURE
+
+#define FEATURE(ENUM, NAME, CPUINFO_FLAG, HWCAP, HWCAP2) [ENUM] = set_##ENUM,
+static void (*const kSetters[])(DEFINE_TABLE_FEATURE_TYPE*,
+    bool) = {DEFINE_TABLE_FEATURES};
+#undef FEATURE
+
+#define FEATURE(ENUM, NAME, CPUINFO_FLAG, HWCAP, HWCAP2) [ENUM] = get_##ENUM,
+static int (*const kGetters[])(const DEFINE_TABLE_FEATURE_TYPE*) = {
+    DEFINE_TABLE_FEATURES};
+#undef FEATURE
+
+#endif  // SRC_DEFINE_TABLES_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/filesystem.c

@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "internal/filesystem.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#if defined(CPU_FEATURES_MOCK_FILESYSTEM)
+// Implementation will be provided by test/filesystem_for_testing.cc.
+#elif defined(_MSC_VER)
+#include <io.h>
+int CpuFeatures_OpenFile(const char* filename)
+{
+    int fd = -1;
+    _sopen_s(&fd, filename, _O_RDONLY, _SH_DENYWR, _S_IREAD);
+    return fd;
+}
+
+void CpuFeatures_CloseFile(int file_descriptor) { _close(file_descriptor); }
+
+int CpuFeatures_ReadFile(int file_descriptor, void* buffer,
+    size_t buffer_size)
+{
+    return _read(file_descriptor, buffer, (unsigned int)buffer_size);
+}
+
+#else
+#include <unistd.h>
+
+int CpuFeatures_OpenFile(const char* filename)
+{
+    int result;
+    do
+        {
+            result = open(filename, O_RDONLY);
+        }
+    while (result == -1L && errno == EINTR);
+    return result;
+}
+
+void CpuFeatures_CloseFile(int file_descriptor) { close(file_descriptor); }
+
+int CpuFeatures_ReadFile(int file_descriptor, void* buffer,
+    size_t buffer_size)
+{
+    int result;
+    do
+        {
+            result = read(file_descriptor, buffer, buffer_size);
+        }
+    while (result == -1L && errno == EINTR);
+    return result;
+}
+
+#endif

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/hwcaps.c

@@ -0,0 +1,190 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "internal/hwcaps.h"
+#include "cpu_features_macros.h"
+#include "internal/filesystem.h"
+#include "internal/string_view.h"
+#include <stdlib.h>
+#include <string.h>
+
+static bool IsSet(const uint32_t mask, const uint32_t value)
+{
+    if (mask == 0) return false;
+    return (value & mask) == mask;
+}
+
+bool CpuFeatures_IsHwCapsSet(const HardwareCapabilities hwcaps_mask,
+    const HardwareCapabilities hwcaps)
+{
+    return IsSet(hwcaps_mask.hwcaps, hwcaps.hwcaps) ||
+           IsSet(hwcaps_mask.hwcaps2, hwcaps.hwcaps2);
+}
+
+#ifdef CPU_FEATURES_TEST
+// In test mode, hwcaps_for_testing will define the following functions.
+HardwareCapabilities CpuFeatures_GetHardwareCapabilities(void);
+PlatformType CpuFeatures_GetPlatformType(void);
+#else
+
+// Debug facilities
+#if defined(NDEBUG)
+#define D(...)
+#else
+#include <stdio.h>
+#define D(...)                   \
+    do                           \
+        {                        \
+            printf(__VA_ARGS__); \
+            fflush(stdout);      \
+        }                        \
+    while (0)
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Implementation of GetElfHwcapFromGetauxval
+////////////////////////////////////////////////////////////////////////////////
+
+#define AT_HWCAP 16
+#define AT_HWCAP2 26
+#define AT_PLATFORM 15
+#define AT_BASE_PLATFORM 24
+
+#if defined(HAVE_STRONG_GETAUXVAL)
+#include <sys/auxv.h>
+static unsigned long GetElfHwcapFromGetauxval(uint32_t hwcap_type)
+{
+    return getauxval(hwcap_type);
+}
+#elif defined(HAVE_DLFCN_H)
+// On Android we probe the system's C library for a 'getauxval' function and
+// call it if it exits, or return 0 for failure. This function is available
+// since API level 20.
+//
+// This code does *NOT* check for '__ANDROID_API__ >= 20' to support the edge
+// case where some NDK developers use headers for a platform that is newer than
+// the one really targetted by their application. This is typically done to use
+// newer native APIs only when running on more recent Android versions, and
+// requires careful symbol management.
+//
+// Note that getauxval() can't really be re-implemented here, because its
+// implementation does not parse /proc/self/auxv. Instead it depends on values
+// that are passed by the kernel at process-init time to the C runtime
+// initialization layer.
+
+#include <dlfcn.h>
+
+typedef unsigned long getauxval_func_t(unsigned long);
+
+static uint32_t GetElfHwcapFromGetauxval(uint32_t hwcap_type)
+{
+    uint32_t ret = 0;
+    void *libc_handle = NULL;
+    getauxval_func_t *func = NULL;
+
+    dlerror();  // Cleaning error state before calling dlopen.
+    libc_handle = dlopen("libc.so", RTLD_NOW);
+    if (!libc_handle)
+        {
+            D("Could not dlopen() C library: %s\n", dlerror());
+            return 0;
+        }
+    func = (getauxval_func_t *)dlsym(libc_handle, "getauxval");
+    if (!func)
+        {
+            D("Could not find getauxval() in C library\n");
+        }
+    else
+        {
+            // Note: getauxval() returns 0 on failure. Doesn't touch errno.
+            ret = (uint32_t)(*func)(hwcap_type);
+        }
+    dlclose(libc_handle);
+    return ret;
+}
+#else
+#error "This platform does not provide hardware capabilities."
+#endif
+
+// Implementation of GetHardwareCapabilities for OS that provide
+// GetElfHwcapFromGetauxval().
+
+// Fallback when getauxval is not available, retrieves hwcaps from
+// "/proc/self/auxv".
+static uint32_t GetElfHwcapFromProcSelfAuxv(uint32_t hwcap_type)
+{
+    struct
+    {
+        uint32_t tag;
+        uint32_t value;
+    } entry;
+    uint32_t result = 0;
+    const char filepath[] = "/proc/self/auxv";
+    const int fd = CpuFeatures_OpenFile(filepath);
+    if (fd < 0)
+        {
+            D("Could not open %s\n", filepath);
+            return 0;
+        }
+    for (;;)
+        {
+            const int ret = CpuFeatures_ReadFile(fd, (char *)&entry, sizeof entry);
+            if (ret < 0)
+                {
+                    D("Error while reading %s\n", filepath);
+                    break;
+                }
+            // Detect end of list.
+            if (ret == 0 || (entry.tag == 0 && entry.value == 0))
+                {
+                    break;
+                }
+            if (entry.tag == hwcap_type)
+                {
+                    result = entry.value;
+                    break;
+                }
+        }
+    CpuFeatures_CloseFile(fd);
+    return result;
+}
+
+// Retrieves hardware capabilities by first trying to call getauxval, if not
+// available falls back to reading "/proc/self/auxv".
+static unsigned long GetHardwareCapabilitiesFor(uint32_t type)
+{
+    unsigned long hwcaps = GetElfHwcapFromGetauxval(type);
+    if (!hwcaps)
+        {
+            D("Parsing /proc/self/auxv to extract ELF hwcaps!\n");
+            hwcaps = GetElfHwcapFromProcSelfAuxv(type);
+        }
+    return hwcaps;
+}
+
+HardwareCapabilities CpuFeatures_GetHardwareCapabilities(void)
+{
+    HardwareCapabilities capabilities;
+    capabilities.hwcaps = GetHardwareCapabilitiesFor(AT_HWCAP);
+    capabilities.hwcaps2 = GetHardwareCapabilitiesFor(AT_HWCAP2);
+    return capabilities;
+}
+
+PlatformType kEmptyPlatformType;
+
+PlatformType CpuFeatures_GetPlatformType(void)
+{
+    PlatformType type = kEmptyPlatformType;
+    char *platform = (char *)GetHardwareCapabilitiesFor(AT_PLATFORM);
+    char *base_platform = (char *)GetHardwareCapabilitiesFor(AT_BASE_PLATFORM);
+
+    if (platform != NULL)
+        CpuFeatures_StringView_CopyString(str(platform), type.platform,
+            sizeof(type.platform));
+    if (base_platform != NULL)
+        CpuFeatures_StringView_CopyString(str(base_platform), type.base_platform,
+            sizeof(type.base_platform));
+    return type;
+}
+
+#endif  // CPU_FEATURES_TEST

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/stack_line_reader.c

@@ -0,0 +1,140 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "internal/stack_line_reader.h"
+#include "internal/filesystem.h"
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+
+void StackLineReader_Initialize(StackLineReader* reader, int fd)
+{
+    reader->view.ptr = reader->buffer;
+    reader->view.size = 0;
+    reader->skip_mode = false;
+    reader->fd = fd;
+}
+
+// Replaces the content of buffer with bytes from the file.
+static int LoadFullBuffer(StackLineReader* reader)
+{
+    const int read = CpuFeatures_ReadFile(reader->fd, reader->buffer,
+        STACK_LINE_READER_BUFFER_SIZE);
+    assert(read >= 0);
+    reader->view.ptr = reader->buffer;
+    reader->view.size = read;
+    return read;
+}
+
+// Appends with bytes from the file to buffer, filling the remaining space.
+static int LoadMore(StackLineReader* reader)
+{
+    char* const ptr = reader->buffer + reader->view.size;
+    const size_t size_to_read = STACK_LINE_READER_BUFFER_SIZE - reader->view.size;
+    const int read = CpuFeatures_ReadFile(reader->fd, ptr, size_to_read);
+    assert(read >= 0);
+    assert(read <= (int)size_to_read);
+    reader->view.size += read;
+    return read;
+}
+
+static int IndexOfEol(StackLineReader* reader)
+{
+    return CpuFeatures_StringView_IndexOfChar(reader->view, '\n');
+}
+
+// Relocate buffer's pending bytes at the beginning of the array and fills the
+// remaining space with bytes from the file.
+static int BringToFrontAndLoadMore(StackLineReader* reader)
+{
+    if (reader->view.size && reader->view.ptr != reader->buffer)
+        {
+            memmove(reader->buffer, reader->view.ptr, reader->view.size);
+        }
+    reader->view.ptr = reader->buffer;
+    return LoadMore(reader);
+}
+
+// Loads chunks of buffer size from disks until it contains a newline character
+// or end of file.
+static void SkipToNextLine(StackLineReader* reader)
+{
+    for (;;)
+        {
+            const int read = LoadFullBuffer(reader);
+            if (read == 0)
+                {
+                    break;
+                }
+            else
+                {
+                    const int eol_index = IndexOfEol(reader);
+                    if (eol_index >= 0)
+                        {
+                            reader->view =
+                                CpuFeatures_StringView_PopFront(reader->view, eol_index + 1);
+                            break;
+                        }
+                }
+        }
+}
+
+static LineResult CreateLineResult(bool eof, bool full_line, StringView view)
+{
+    LineResult result;
+    result.eof = eof;
+    result.full_line = full_line;
+    result.line = view;
+    return result;
+}
+
+// Helper methods to provide clearer semantic in StackLineReader_NextLine.
+static LineResult CreateEOFLineResult(StringView view)
+{
+    return CreateLineResult(true, true, view);
+}
+
+static LineResult CreateTruncatedLineResult(StringView view)
+{
+    return CreateLineResult(false, false, view);
+}
+
+static LineResult CreateValidLineResult(StringView view)
+{
+    return CreateLineResult(false, true, view);
+}
+
+LineResult StackLineReader_NextLine(StackLineReader* reader)
+{
+    if (reader->skip_mode)
+        {
+            SkipToNextLine(reader);
+            reader->skip_mode = false;
+        }
+    {
+        const bool can_load_more =
+            reader->view.size < STACK_LINE_READER_BUFFER_SIZE;
+        int eol_index = IndexOfEol(reader);
+        if (eol_index < 0 && can_load_more)
+            {
+                const int read = BringToFrontAndLoadMore(reader);
+                if (read == 0)
+                    {
+                        return CreateEOFLineResult(reader->view);
+                    }
+                eol_index = IndexOfEol(reader);
+            }
+        if (eol_index < 0)
+            {
+                reader->skip_mode = true;
+                return CreateTruncatedLineResult(reader->view);
+            }
+        {
+            StringView line =
+                CpuFeatures_StringView_KeepFront(reader->view, eol_index);
+            reader->view =
+                CpuFeatures_StringView_PopFront(reader->view, eol_index + 1);
+            return CreateValidLineResult(line);
+        }
+    }
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/string_view.c

@@ -0,0 +1,202 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "internal/string_view.h"
+#include <assert.h>
+#include <ctype.h>
+#include <string.h>
+
+int CpuFeatures_StringView_IndexOfChar(const StringView view, char c)
+{
+    if (view.ptr && view.size)
+        {
+            const char* const found = (const char*)memchr(view.ptr, c, view.size);
+            if (found)
+                {
+                    return (int)(found - view.ptr);
+                }
+        }
+    return -1;
+}
+
+int CpuFeatures_StringView_IndexOf(const StringView view,
+    const StringView sub_view)
+{
+    if (sub_view.size)
+        {
+            StringView remainder = view;
+            while (remainder.size >= sub_view.size)
+                {
+                    const int found_index =
+                        CpuFeatures_StringView_IndexOfChar(remainder, sub_view.ptr[0]);
+                    if (found_index < 0) break;
+                    remainder = CpuFeatures_StringView_PopFront(remainder, found_index);
+                    if (CpuFeatures_StringView_StartsWith(remainder, sub_view))
+                        {
+                            return (int)(remainder.ptr - view.ptr);
+                        }
+                    remainder = CpuFeatures_StringView_PopFront(remainder, 1);
+                }
+        }
+    return -1;
+}
+
+bool CpuFeatures_StringView_IsEquals(const StringView a, const StringView b)
+{
+    if (a.size == b.size)
+        {
+            return a.ptr == b.ptr || memcmp(a.ptr, b.ptr, b.size) == 0;
+        }
+    return false;
+}
+
+bool CpuFeatures_StringView_StartsWith(const StringView a, const StringView b)
+{
+    return a.ptr && b.ptr && b.size && a.size >= b.size
+               ? memcmp(a.ptr, b.ptr, b.size) == 0
+               : false;
+}
+
+StringView CpuFeatures_StringView_PopFront(const StringView str_view,
+    size_t count)
+{
+    if (count > str_view.size)
+        {
+            return kEmptyStringView;
+        }
+    return view(str_view.ptr + count, str_view.size - count);
+}
+
+StringView CpuFeatures_StringView_PopBack(const StringView str_view,
+    size_t count)
+{
+    if (count > str_view.size)
+        {
+            return kEmptyStringView;
+        }
+    return view(str_view.ptr, str_view.size - count);
+}
+
+StringView CpuFeatures_StringView_KeepFront(const StringView str_view,
+    size_t count)
+{
+    return count <= str_view.size ? view(str_view.ptr, count) : str_view;
+}
+
+char CpuFeatures_StringView_Front(const StringView view)
+{
+    assert(view.size);
+    assert(view.ptr);
+    return view.ptr[0];
+}
+
+char CpuFeatures_StringView_Back(const StringView view)
+{
+    assert(view.size);
+    return view.ptr[view.size - 1];
+}
+
+StringView CpuFeatures_StringView_TrimWhitespace(StringView view)
+{
+    while (view.size && isspace(CpuFeatures_StringView_Front(view)))
+        view = CpuFeatures_StringView_PopFront(view, 1);
+    while (view.size && isspace(CpuFeatures_StringView_Back(view)))
+        view = CpuFeatures_StringView_PopBack(view, 1);
+    return view;
+}
+
+static int HexValue(const char c)
+{
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+    return -1;
+}
+
+// Returns -1 if view contains non digits.
+static int ParsePositiveNumberWithBase(const StringView view, int base)
+{
+    int result = 0;
+    StringView remainder = view;
+    for (; remainder.size;
+         remainder = CpuFeatures_StringView_PopFront(remainder, 1))
+        {
+            const int value = HexValue(CpuFeatures_StringView_Front(remainder));
+            if (value < 0 || value >= base) return -1;
+            result = (result * base) + value;
+        }
+    return result;
+}
+
+int CpuFeatures_StringView_ParsePositiveNumber(const StringView view)
+{
+    if (view.size)
+        {
+            const StringView hex_prefix = str("0x");
+            if (CpuFeatures_StringView_StartsWith(view, hex_prefix))
+                {
+                    const StringView span_no_prefix =
+                        CpuFeatures_StringView_PopFront(view, hex_prefix.size);
+                    return ParsePositiveNumberWithBase(span_no_prefix, 16);
+                }
+            return ParsePositiveNumberWithBase(view, 10);
+        }
+    return -1;
+}
+
+void CpuFeatures_StringView_CopyString(const StringView src, char* dst,
+    size_t dst_size)
+{
+    if (dst_size > 0)
+        {
+            const size_t max_copy_size = dst_size - 1;
+            const size_t copy_size =
+                src.size > max_copy_size ? max_copy_size : src.size;
+            memcpy(dst, src.ptr, copy_size);
+            dst[copy_size] = '\0';
+        }
+}
+
+bool CpuFeatures_StringView_HasWord(const StringView line,
+    const char* const word_str)
+{
+    const StringView word = str(word_str);
+    StringView remainder = line;
+    for (;;)
+        {
+            const int index_of_word = CpuFeatures_StringView_IndexOf(remainder, word);
+            if (index_of_word < 0)
+                {
+                    return false;
+                }
+            else
+                {
+                    const StringView before =
+                        CpuFeatures_StringView_KeepFront(line, index_of_word);
+                    const StringView after =
+                        CpuFeatures_StringView_PopFront(line, index_of_word + word.size);
+                    const bool valid_before =
+                        before.size == 0 || CpuFeatures_StringView_Back(before) == ' ';
+                    const bool valid_after =
+                        after.size == 0 || CpuFeatures_StringView_Front(after) == ' ';
+                    if (valid_before && valid_after) return true;
+                    remainder =
+                        CpuFeatures_StringView_PopFront(remainder, index_of_word + word.size);
+                }
+        }
+    return false;
+}
+
+bool CpuFeatures_StringView_GetAttributeKeyValue(const StringView line,
+    StringView* key,
+    StringView* value)
+{
+    const StringView sep = str(": ");
+    const int index_of_separator = CpuFeatures_StringView_IndexOf(line, sep);
+    if (index_of_separator < 0) return false;
+    *value = CpuFeatures_StringView_TrimWhitespace(
+        CpuFeatures_StringView_PopFront(line, index_of_separator + sep.size));
+    *key = CpuFeatures_StringView_TrimWhitespace(
+        CpuFeatures_StringView_KeepFront(line, index_of_separator));
+    return true;
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/src/utils/list_cpu_features.c

@@ -0,0 +1,471 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+// This program dumps current host data to the standard output.
+// Output can be text or json if the `--json` flag is passed.
+
+#include "cpu_features_macros.h"
+#include <assert.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(CPU_FEATURES_ARCH_X86)
+#include "cpuinfo_x86.h"
+#elif defined(CPU_FEATURES_ARCH_ARM)
+#include "cpuinfo_arm.h"
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+#include "cpuinfo_aarch64.h"
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+#include "cpuinfo_mips.h"
+#elif defined(CPU_FEATURES_ARCH_PPC)
+#include "cpuinfo_ppc.h"
+#endif
+
+// Design principles
+// -----------------
+// We build a tree structure containing all the data to be displayed.
+// Then depending on the output type (text or json) we walk the tree and display
+// the data accordingly.
+
+// We use a bump allocator to allocate strings and nodes of the tree,
+// Memory is not intended to be reclaimed.
+typedef struct
+{
+    char* ptr;
+    size_t size;
+} BumpAllocator;
+
+char gGlobalBuffer[64 * 1024];
+BumpAllocator gBumpAllocator = {.ptr = gGlobalBuffer,
+    .size = sizeof(gGlobalBuffer)};
+
+static void internal_error()
+{
+    fputs("internal error\n", stderr);
+    exit(EXIT_FAILURE);
+}
+
+#define ALIGN 8
+
+static void assertAligned()
+{
+    if ((uintptr_t)(gBumpAllocator.ptr) % ALIGN) internal_error();
+}
+
+static void BA_Align()
+{
+    while (gBumpAllocator.size && (uintptr_t)(gBumpAllocator.ptr) % ALIGN)
+        {
+            --gBumpAllocator.size;
+            ++gBumpAllocator.ptr;
+        }
+    assertAligned();
+}
+
+// Update the available memory left in the BumpAllocator.
+static void* BA_Bump(size_t size)
+{
+    assertAligned();
+    // Align size to next 8B boundary.
+    size = (size + ALIGN - 1) / ALIGN * ALIGN;
+    if (gBumpAllocator.size < size) internal_error();
+    void* ptr = gBumpAllocator.ptr;
+    gBumpAllocator.size -= size;
+    gBumpAllocator.ptr += size;
+    return ptr;
+}
+
+// The type of the nodes in the tree.
+typedef enum
+{
+    NT_INVALID,
+    NT_INT,
+    NT_MAP,
+    NT_MAP_ENTRY,
+    NT_ARRAY,
+    NT_ARRAY_ELEMENT,
+    NT_STRING,
+} NodeType;
+
+// The node in the tree.
+typedef struct Node
+{
+    NodeType type;
+    unsigned integer;
+    const char* string;
+    struct Node* value;
+    struct Node* next;
+} Node;
+
+// Creates an initialized Node.
+static Node* BA_CreateNode(NodeType type)
+{
+    Node* tv = (Node*)BA_Bump(sizeof(Node));
+    assert(tv);
+    *tv = (Node){.type = type};
+    return tv;
+}
+
+// Adds an integer node.
+static Node* CreateInt(int value)
+{
+    Node* tv = BA_CreateNode(NT_INT);
+    tv->integer = value;
+    return tv;
+}
+
+// Adds a string node.
+// `value` must outlive the tree.
+static Node* CreateConstantString(const char* value)
+{
+    Node* tv = BA_CreateNode(NT_STRING);
+    tv->string = value;
+    return tv;
+}
+
+// Adds a map node.
+static Node* CreateMap() { return BA_CreateNode(NT_MAP); }
+
+// Adds an array node.
+static Node* CreateArray() { return BA_CreateNode(NT_ARRAY); }
+
+// Adds a formatted string node.
+static Node* CreatePrintfString(const char* format, ...)
+{
+    va_list arglist;
+    va_start(arglist, format);
+    char* const ptr = gBumpAllocator.ptr;
+    const int written = vsnprintf(ptr, gBumpAllocator.size, format, arglist);
+    va_end(arglist);
+    if (written < 0 || written >= (int)gBumpAllocator.size) internal_error();
+    return CreateConstantString((char*)BA_Bump(written));
+}
+
+// Adds a string node.
+static Node* CreateString(const char* value)
+{
+    return CreatePrintfString("%s", value);
+}
+
+// Adds a map entry node.
+static void AddMapEntry(Node* map, const char* key, Node* value)
+{
+    assert(map && map->type == NT_MAP);
+    Node* current = map;
+    while (current->next) current = current->next;
+    current->next = (Node*)BA_Bump(sizeof(Node));
+    *current->next = (Node){.type = NT_MAP_ENTRY, .string = key, .value = value};
+}
+
+// Adds an array element node.
+static void AddArrayElement(Node* array, Node* value)
+{
+    assert(array && array->type == NT_ARRAY);
+    Node* current = array;
+    while (current->next) current = current->next;
+    current->next = (Node*)BA_Bump(sizeof(Node));
+    *current->next = (Node){.type = NT_ARRAY_ELEMENT, .value = value};
+}
+
+static int cmp(const void* p1, const void* p2)
+{
+    return strcmp(*(const char* const*)p1, *(const char* const*)p2);
+}
+
+#define DEFINE_ADD_FLAGS(HasFeature, FeatureName, FeatureType, LastEnum) \
+    static void AddFlags(Node* map, const FeatureType* features)         \
+    {                                                                    \
+        size_t i;                                                        \
+        const char* ptrs[LastEnum] = {0};                                \
+        size_t count = 0;                                                \
+        for (i = 0; i < LastEnum; ++i)                                   \
+            {                                                            \
+                if (HasFeature(features, i))                             \
+                    {                                                    \
+                        ptrs[count] = FeatureName(i);                    \
+                        ++count;                                         \
+                    }                                                    \
+            }                                                            \
+        qsort((void*)ptrs, count, sizeof(char*), cmp);                   \
+        Node* const array = CreateArray();                               \
+        for (i = 0; i < count; ++i)                                      \
+            AddArrayElement(array, CreateConstantString(ptrs[i]));       \
+        AddMapEntry(map, "flags", array);                                \
+    }
+
+#if defined(CPU_FEATURES_ARCH_X86)
+DEFINE_ADD_FLAGS(GetX86FeaturesEnumValue, GetX86FeaturesEnumName, X86Features,
+    X86_LAST_)
+#elif defined(CPU_FEATURES_ARCH_ARM)
+DEFINE_ADD_FLAGS(GetArmFeaturesEnumValue, GetArmFeaturesEnumName, ArmFeatures,
+    ARM_LAST_)
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+DEFINE_ADD_FLAGS(GetAarch64FeaturesEnumValue, GetAarch64FeaturesEnumName,
+    Aarch64Features, AARCH64_LAST_)
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+DEFINE_ADD_FLAGS(GetMipsFeaturesEnumValue, GetMipsFeaturesEnumName,
+    MipsFeatures, MIPS_LAST_)
+#elif defined(CPU_FEATURES_ARCH_PPC)
+DEFINE_ADD_FLAGS(GetPPCFeaturesEnumValue, GetPPCFeaturesEnumName, PPCFeatures,
+    PPC_LAST_)
+#endif
+
+// Prints a json string with characters escaping.
+static void printJsonString(const char* str)
+{
+    putchar('"');
+    for (; str && *str; ++str)
+        {
+            switch (*str)
+                {
+                case '\"':
+                case '\\':
+                case '/':
+                case '\b':
+                case '\f':
+                case '\n':
+                case '\r':
+                case '\t':
+                    putchar('\\');
+                }
+            putchar(*str);
+        }
+    putchar('"');
+}
+
+// Walks a Node and print it as json.
+static void printJson(const Node* current)
+{
+    assert(current);
+    switch (current->type)
+        {
+        case NT_INVALID:
+            break;
+        case NT_INT:
+            printf("%d", current->integer);
+            break;
+        case NT_STRING:
+            printJsonString(current->string);
+            break;
+        case NT_ARRAY:
+            putchar('[');
+            if (current->next) printJson(current->next);
+            putchar(']');
+            break;
+        case NT_MAP:
+            putchar('{');
+            if (current->next) printJson(current->next);
+            putchar('}');
+            break;
+        case NT_MAP_ENTRY:
+            printf("\"%s\":", current->string);
+            printJson(current->value);
+            if (current->next)
+                {
+                    putchar(',');
+                    printJson(current->next);
+                }
+            break;
+        case NT_ARRAY_ELEMENT:
+            printJson(current->value);
+            if (current->next)
+                {
+                    putchar(',');
+                    printJson(current->next);
+                }
+            break;
+        }
+}
+
+// Walks a Node and print it as text.
+static void printTextField(const Node* current)
+{
+    switch (current->type)
+        {
+        case NT_INVALID:
+            break;
+        case NT_INT:
+            printf("%3d (0x%02X)", current->integer, current->integer);
+            break;
+        case NT_STRING:
+            fputs(current->string, stdout);
+            break;
+        case NT_ARRAY:
+            if (current->next) printTextField(current->next);
+            break;
+        case NT_MAP:
+            if (current->next)
+                {
+                    printf("{");
+                    printJson(current->next);
+                    printf("}");
+                }
+            break;
+        case NT_MAP_ENTRY:
+            printf("%-15s : ", current->string);
+            printTextField(current->value);
+            if (current->next)
+                {
+                    putchar('\n');
+                    printTextField(current->next);
+                }
+            break;
+        case NT_ARRAY_ELEMENT:
+            printTextField(current->value);
+            if (current->next)
+                {
+                    putchar(',');
+                    printTextField(current->next);
+                }
+            break;
+        }
+}
+
+static void printTextRoot(const Node* current)
+{
+    if (current->type == NT_MAP && current->next) printTextField(current->next);
+}
+
+static void showUsage(const char* name)
+{
+    printf(
+        "\n"
+        "Usage: %s [options]\n"
+        "      Options:\n"
+        "      -h | --help     Show help message.\n"
+        "      -j | --json     Format output as json instead of plain text.\n"
+        "\n",
+        name);
+}
+
+static Node* GetCacheTypeString(CacheType cache_type)
+{
+    switch (cache_type)
+        {
+        case CPU_FEATURE_CACHE_NULL:
+            return CreateConstantString("null");
+        case CPU_FEATURE_CACHE_DATA:
+            return CreateConstantString("data");
+        case CPU_FEATURE_CACHE_INSTRUCTION:
+            return CreateConstantString("instruction");
+        case CPU_FEATURE_CACHE_UNIFIED:
+            return CreateConstantString("unified");
+        case CPU_FEATURE_CACHE_TLB:
+            return CreateConstantString("tlb");
+        case CPU_FEATURE_CACHE_DTLB:
+            return CreateConstantString("dtlb");
+        case CPU_FEATURE_CACHE_STLB:
+            return CreateConstantString("stlb");
+        case CPU_FEATURE_CACHE_PREFETCH:
+            return CreateConstantString("prefetch");
+        default:
+            return CreateConstantString("null");
+        }
+}
+
+static void AddCacheInfo(Node* root, const CacheInfo* cache_info)
+{
+    Node* array = CreateArray();
+    for (int i = 0; i < cache_info->size; ++i)
+        {
+            CacheLevelInfo info = cache_info->levels[i];
+            Node* map = CreateMap();
+            AddMapEntry(map, "level", CreateInt(info.level));
+            AddMapEntry(map, "cache_type", GetCacheTypeString(info.cache_type));
+            AddMapEntry(map, "cache_size", CreateInt(info.cache_size));
+            AddMapEntry(map, "ways", CreateInt(info.ways));
+            AddMapEntry(map, "line_size", CreateInt(info.line_size));
+            AddMapEntry(map, "tlb_entries", CreateInt(info.tlb_entries));
+            AddMapEntry(map, "partitioning", CreateInt(info.partitioning));
+            AddArrayElement(array, map);
+        }
+    AddMapEntry(root, "cache_info", array);
+}
+
+static Node* CreateTree()
+{
+    Node* root = CreateMap();
+#if defined(CPU_FEATURES_ARCH_X86)
+    char brand_string[49];
+    const X86Info info = GetX86Info();
+    const CacheInfo cache_info = GetX86CacheInfo();
+    FillX86BrandString(brand_string);
+    AddMapEntry(root, "arch", CreateString("x86"));
+    AddMapEntry(root, "brand", CreateString(brand_string));
+    AddMapEntry(root, "family", CreateInt(info.family));
+    AddMapEntry(root, "model", CreateInt(info.model));
+    AddMapEntry(root, "stepping", CreateInt(info.stepping));
+    AddMapEntry(root, "uarch",
+        CreateString(
+            GetX86MicroarchitectureName(GetX86Microarchitecture(&info))));
+    AddFlags(root, &info.features);
+    AddCacheInfo(root, &cache_info);
+#elif defined(CPU_FEATURES_ARCH_ARM)
+    const ArmInfo info = GetArmInfo();
+    AddMapEntry(root, "arch", CreateString("ARM"));
+    AddMapEntry(root, "implementer", CreateInt(info.implementer));
+    AddMapEntry(root, "architecture", CreateInt(info.architecture));
+    AddMapEntry(root, "variant", CreateInt(info.variant));
+    AddMapEntry(root, "part", CreateInt(info.part));
+    AddMapEntry(root, "revision", CreateInt(info.revision));
+    AddFlags(root, &info.features);
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+    const Aarch64Info info = GetAarch64Info();
+    AddMapEntry(root, "arch", CreateString("aarch64"));
+    AddMapEntry(root, "implementer", CreateInt(info.implementer));
+    AddMapEntry(root, "variant", CreateInt(info.variant));
+    AddMapEntry(root, "part", CreateInt(info.part));
+    AddMapEntry(root, "revision", CreateInt(info.revision));
+    AddFlags(root, &info.features);
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+    const MipsInfo info = GetMipsInfo();
+    AddMapEntry(root, "arch", CreateString("mips"));
+    AddFlags(root, &info.features);
+#elif defined(CPU_FEATURES_ARCH_PPC)
+    const PPCInfo info = GetPPCInfo();
+    const PPCPlatformStrings strings = GetPPCPlatformStrings();
+    AddMapEntry(root, "arch", CreateString("ppc"));
+    AddMapEntry(root, "platform", CreateString(strings.platform));
+    AddMapEntry(root, "model", CreateString(strings.model));
+    AddMapEntry(root, "machine", CreateString(strings.machine));
+    AddMapEntry(root, "cpu", CreateString(strings.cpu));
+    AddMapEntry(root, "instruction", CreateString(strings.type.platform));
+    AddMapEntry(root, "microarchitecture",
+        CreateString(strings.type.base_platform));
+    AddFlags(root, &info.features);
+#endif
+    return root;
+}
+
+int main(int argc, char** argv)
+{
+    BA_Align();
+    const Node* const root = CreateTree();
+    bool outputJson = false;
+    int i = 1;
+    for (; i < argc; ++i)
+        {
+            const char* arg = argv[i];
+            if (strcmp(arg, "-j") == 0 || strcmp(arg, "--json") == 0)
+                {
+                    outputJson = true;
+                }
+            else
+                {
+                    showUsage(argv[0]);
+                    if (strcmp(arg, "-h") == 0 || strcmp(arg, "--help") == 0)
+                        return EXIT_SUCCESS;
+                    return EXIT_FAILURE;
+                }
+        }
+    if (outputJson)
+        printJson(root);
+    else
+        printTextRoot(root);
+    putchar('\n');
+    return EXIT_SUCCESS;
+}

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/CMakeLists.txt

@@ -0,0 +1,88 @@
+# SPDX-FileCopyrightText: 2017 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+#
+# libraries for tests
+#
+
+include_directories(../include)
+add_definitions(-DCPU_FEATURES_TEST)
+
+##------------------------------------------------------------------------------
+add_library(string_view ../src/string_view.c)
+##------------------------------------------------------------------------------
+add_library(filesystem_for_testing filesystem_for_testing.cc)
+target_compile_definitions(filesystem_for_testing PUBLIC CPU_FEATURES_MOCK_FILESYSTEM)
+##------------------------------------------------------------------------------
+add_library(hwcaps_for_testing hwcaps_for_testing.cc)
+target_link_libraries(hwcaps_for_testing filesystem_for_testing)
+##------------------------------------------------------------------------------
+add_library(stack_line_reader ../src/stack_line_reader.c)
+target_compile_definitions(stack_line_reader PUBLIC STACK_LINE_READER_BUFFER_SIZE=1024)
+target_link_libraries(stack_line_reader string_view)
+##------------------------------------------------------------------------------
+add_library(stack_line_reader_for_test ../src/stack_line_reader.c)
+target_compile_definitions(stack_line_reader_for_test PUBLIC STACK_LINE_READER_BUFFER_SIZE=16)
+target_link_libraries(stack_line_reader_for_test string_view filesystem_for_testing)
+##------------------------------------------------------------------------------
+add_library(all_libraries ../src/hwcaps.c  ../src/stack_line_reader.c)
+target_link_libraries(all_libraries hwcaps_for_testing stack_line_reader string_view)
+
+#
+# tests
+#
+link_libraries(gtest gmock_main)
+
+## bit_utils_test
+add_executable(bit_utils_test bit_utils_test.cc)
+target_link_libraries(bit_utils_test)
+add_test(NAME bit_utils_test COMMAND bit_utils_test)
+##------------------------------------------------------------------------------
+## string_view_test
+add_executable(string_view_test string_view_test.cc ../src/string_view.c)
+target_link_libraries(string_view_test string_view)
+add_test(NAME string_view_test COMMAND string_view_test)
+##------------------------------------------------------------------------------
+## stack_line_reader_test
+add_executable(stack_line_reader_test stack_line_reader_test.cc)
+target_link_libraries(stack_line_reader_test stack_line_reader_for_test)
+add_test(NAME stack_line_reader_test COMMAND stack_line_reader_test)
+##------------------------------------------------------------------------------
+## cpuinfo_x86_test
+if(PROCESSOR_IS_X86)
+  add_executable(cpuinfo_x86_test cpuinfo_x86_test.cc ../src/cpuinfo_x86.c)
+  target_compile_definitions(cpuinfo_x86_test PUBLIC CPU_FEATURES_MOCK_CPUID_X86)
+  if(APPLE)
+    target_compile_definitions(cpuinfo_x86_test PRIVATE HAVE_SYSCTLBYNAME)
+  endif()
+  target_link_libraries(cpuinfo_x86_test all_libraries)
+  add_test(NAME cpuinfo_x86_test COMMAND cpuinfo_x86_test)
+endif()
+##------------------------------------------------------------------------------
+## cpuinfo_arm_test
+if(PROCESSOR_IS_ARM)
+  add_executable(cpuinfo_arm_test cpuinfo_arm_test.cc ../src/cpuinfo_arm.c)
+  target_link_libraries(cpuinfo_arm_test all_libraries)
+  add_test(NAME cpuinfo_arm_test COMMAND cpuinfo_arm_test)
+endif()
+##------------------------------------------------------------------------------
+## cpuinfo_aarch64_test
+if(PROCESSOR_IS_AARCH64)
+  add_executable(cpuinfo_aarch64_test cpuinfo_aarch64_test.cc ../src/cpuinfo_aarch64.c)
+  target_link_libraries(cpuinfo_aarch64_test all_libraries)
+  add_test(NAME cpuinfo_aarch64_test COMMAND cpuinfo_aarch64_test)
+endif()
+##------------------------------------------------------------------------------
+## cpuinfo_mips_test
+if(PROCESSOR_IS_MIPS)
+  add_executable(cpuinfo_mips_test cpuinfo_mips_test.cc  ../src/cpuinfo_mips.c)
+  target_link_libraries(cpuinfo_mips_test all_libraries)
+  add_test(NAME cpuinfo_mips_test COMMAND cpuinfo_mips_test)
+endif()
+##------------------------------------------------------------------------------
+## cpuinfo_ppc_test
+if(PROCESSOR_IS_POWER)
+  add_executable(cpuinfo_ppc_test cpuinfo_ppc_test.cc  ../src/cpuinfo_ppc.c)
+  target_link_libraries(cpuinfo_ppc_test all_libraries)
+  add_test(NAME cpuinfo_ppc_test COMMAND cpuinfo_ppc_test)
+endif()

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/bit_utils_test.cc

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "gtest/gtest.h"
+#include "internal/bit_utils.h"
+
+namespace cpu_features
+{
+namespace
+{
+TEST(UtilsTest, IsBitSet)
+{
+    for (size_t bit_set = 0; bit_set < 32; ++bit_set)
+        {
+            const uint32_t value = 1UL << bit_set;
+            for (uint32_t i = 0; i < 32; ++i)
+                {
+                    EXPECT_EQ(IsBitSet(value, i), i == bit_set);
+                }
+        }
+
+    // testing 0, all bits should be 0.
+    for (uint32_t i = 0; i < 32; ++i)
+        {
+            EXPECT_FALSE(IsBitSet(0, i));
+        }
+
+    // testing ~0, all bits should be 1.
+    for (uint32_t i = 0; i < 32; ++i)
+        {
+            EXPECT_TRUE(IsBitSet(-1, i));
+        }
+}
+
+TEST(UtilsTest, ExtractBitRange)
+{
+    // Extracting all bits gives the same number.
+    EXPECT_EQ(ExtractBitRange(123, 31, 0), 123);
+    // Extracting 1 bit gives parity.
+    EXPECT_EQ(ExtractBitRange(123, 0, 0), 1);
+    EXPECT_EQ(ExtractBitRange(122, 0, 0), 0);
+
+    EXPECT_EQ(ExtractBitRange(0xF0, 7, 4), 0xF);
+    EXPECT_EQ(ExtractBitRange(0x42 << 2, 10, 2), 0x42);
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/cpuinfo_aarch64_test.cc

@@ -0,0 +1,163 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_aarch64.h"
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "hwcaps_for_testing.h"
+
+namespace cpu_features
+{
+namespace
+{
+void DisableHardwareCapabilities() { SetHardwareCapabilities(0, 0); }
+
+TEST(CpuinfoAarch64Test, FromHardwareCap)
+{
+    SetHardwareCapabilities(AARCH64_HWCAP_FP | AARCH64_HWCAP_AES, 0);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetAarch64Info();
+    EXPECT_TRUE(info.features.fp);
+    EXPECT_FALSE(info.features.asimd);
+    EXPECT_FALSE(info.features.evtstrm);
+    EXPECT_TRUE(info.features.aes);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+    EXPECT_FALSE(info.features.crc32);
+    EXPECT_FALSE(info.features.atomics);
+    EXPECT_FALSE(info.features.fphp);
+    EXPECT_FALSE(info.features.asimdhp);
+    EXPECT_FALSE(info.features.cpuid);
+    EXPECT_FALSE(info.features.asimdrdm);
+    EXPECT_FALSE(info.features.jscvt);
+    EXPECT_FALSE(info.features.fcma);
+    EXPECT_FALSE(info.features.lrcpc);
+    EXPECT_FALSE(info.features.dcpop);
+    EXPECT_FALSE(info.features.sha3);
+    EXPECT_FALSE(info.features.sm3);
+    EXPECT_FALSE(info.features.sm4);
+    EXPECT_FALSE(info.features.asimddp);
+    EXPECT_FALSE(info.features.sha512);
+    EXPECT_FALSE(info.features.sve);
+    EXPECT_FALSE(info.features.asimdfhm);
+    EXPECT_FALSE(info.features.dit);
+    EXPECT_FALSE(info.features.uscat);
+    EXPECT_FALSE(info.features.ilrcpc);
+    EXPECT_FALSE(info.features.flagm);
+    EXPECT_FALSE(info.features.ssbs);
+    EXPECT_FALSE(info.features.sb);
+    EXPECT_FALSE(info.features.paca);
+    EXPECT_FALSE(info.features.pacg);
+}
+
+TEST(CpuinfoAarch64Test, FromHardwareCap2)
+{
+    SetHardwareCapabilities(AARCH64_HWCAP_FP,
+        AARCH64_HWCAP2_SVE2 | AARCH64_HWCAP2_BTI);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetAarch64Info();
+    EXPECT_TRUE(info.features.fp);
+
+    EXPECT_TRUE(info.features.sve2);
+    EXPECT_TRUE(info.features.bti);
+
+    EXPECT_FALSE(info.features.dcpodp);
+    EXPECT_FALSE(info.features.sveaes);
+    EXPECT_FALSE(info.features.svepmull);
+    EXPECT_FALSE(info.features.svebitperm);
+    EXPECT_FALSE(info.features.svesha3);
+    EXPECT_FALSE(info.features.svesm4);
+    EXPECT_FALSE(info.features.flagm2);
+    EXPECT_FALSE(info.features.frint);
+    EXPECT_FALSE(info.features.svei8mm);
+    EXPECT_FALSE(info.features.svef32mm);
+    EXPECT_FALSE(info.features.svef64mm);
+    EXPECT_FALSE(info.features.svebf16);
+    EXPECT_FALSE(info.features.i8mm);
+    EXPECT_FALSE(info.features.bf16);
+    EXPECT_FALSE(info.features.dgh);
+    EXPECT_FALSE(info.features.rng);
+}
+
+TEST(CpuinfoAarch64Test, ARMCortexA53)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(Processor   : AArch64 Processor rev 3 (aarch64)
+processor   : 0
+processor   : 1
+processor   : 2
+processor   : 3
+processor   : 4
+processor   : 5
+processor   : 6
+processor   : 7
+Features    : fp asimd evtstrm aes pmull sha1 sha2 crc32
+CPU implementer : 0x41
+CPU architecture: AArch64
+CPU variant : 0x0
+CPU part    : 0xd03
+CPU revision    : 3)");
+    const auto info = GetAarch64Info();
+    EXPECT_EQ(info.implementer, 0x41);
+    EXPECT_EQ(info.variant, 0x0);
+    EXPECT_EQ(info.part, 0xd03);
+    EXPECT_EQ(info.revision, 3);
+
+    EXPECT_TRUE(info.features.fp);
+    EXPECT_TRUE(info.features.asimd);
+    EXPECT_TRUE(info.features.evtstrm);
+    EXPECT_TRUE(info.features.aes);
+    EXPECT_TRUE(info.features.pmull);
+    EXPECT_TRUE(info.features.sha1);
+    EXPECT_TRUE(info.features.sha2);
+    EXPECT_TRUE(info.features.crc32);
+
+    EXPECT_FALSE(info.features.atomics);
+    EXPECT_FALSE(info.features.fphp);
+    EXPECT_FALSE(info.features.asimdhp);
+    EXPECT_FALSE(info.features.cpuid);
+    EXPECT_FALSE(info.features.asimdrdm);
+    EXPECT_FALSE(info.features.jscvt);
+    EXPECT_FALSE(info.features.fcma);
+    EXPECT_FALSE(info.features.lrcpc);
+    EXPECT_FALSE(info.features.dcpop);
+    EXPECT_FALSE(info.features.sha3);
+    EXPECT_FALSE(info.features.sm3);
+    EXPECT_FALSE(info.features.sm4);
+    EXPECT_FALSE(info.features.asimddp);
+    EXPECT_FALSE(info.features.sha512);
+    EXPECT_FALSE(info.features.sve);
+    EXPECT_FALSE(info.features.asimdfhm);
+    EXPECT_FALSE(info.features.dit);
+    EXPECT_FALSE(info.features.uscat);
+    EXPECT_FALSE(info.features.ilrcpc);
+    EXPECT_FALSE(info.features.flagm);
+    EXPECT_FALSE(info.features.ssbs);
+    EXPECT_FALSE(info.features.sb);
+    EXPECT_FALSE(info.features.paca);
+    EXPECT_FALSE(info.features.pacg);
+    EXPECT_FALSE(info.features.dcpodp);
+    EXPECT_FALSE(info.features.sve2);
+    EXPECT_FALSE(info.features.sveaes);
+    EXPECT_FALSE(info.features.svepmull);
+    EXPECT_FALSE(info.features.svebitperm);
+    EXPECT_FALSE(info.features.svesha3);
+    EXPECT_FALSE(info.features.svesm4);
+    EXPECT_FALSE(info.features.flagm2);
+    EXPECT_FALSE(info.features.frint);
+    EXPECT_FALSE(info.features.svei8mm);
+    EXPECT_FALSE(info.features.svef32mm);
+    EXPECT_FALSE(info.features.svef64mm);
+    EXPECT_FALSE(info.features.svebf16);
+    EXPECT_FALSE(info.features.i8mm);
+    EXPECT_FALSE(info.features.bf16);
+    EXPECT_FALSE(info.features.dgh);
+    EXPECT_FALSE(info.features.rng);
+    EXPECT_FALSE(info.features.bti);
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/cpuinfo_arm_test.cc

@@ -0,0 +1,344 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_arm.h"
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "hwcaps_for_testing.h"
+
+namespace cpu_features
+{
+namespace
+{
+void DisableHardwareCapabilities() { SetHardwareCapabilities(0, 0); }
+
+TEST(CpuinfoArmTest, FromHardwareCap)
+{
+    SetHardwareCapabilities(ARM_HWCAP_NEON, ARM_HWCAP2_AES | ARM_HWCAP2_CRC32);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetArmInfo();
+    EXPECT_TRUE(info.features.vfp);    // triggered by vfpv3
+    EXPECT_TRUE(info.features.vfpv3);  // triggered by neon
+    EXPECT_TRUE(info.features.neon);
+    EXPECT_TRUE(info.features.aes);
+    EXPECT_TRUE(info.features.crc32);
+
+    EXPECT_FALSE(info.features.vfpv4);
+    EXPECT_FALSE(info.features.iwmmxt);
+    EXPECT_FALSE(info.features.crunch);
+    EXPECT_FALSE(info.features.thumbee);
+    EXPECT_FALSE(info.features.vfpv3d16);
+    EXPECT_FALSE(info.features.idiva);
+    EXPECT_FALSE(info.features.idivt);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+
+    // check some random features with EnumValue():
+    EXPECT_TRUE(GetArmFeaturesEnumValue(&info.features, ARM_VFP));
+    EXPECT_FALSE(GetArmFeaturesEnumValue(&info.features, ARM_VFPV4));
+    // out of bound EnumValue() check
+    EXPECT_FALSE(GetArmFeaturesEnumValue(&info.features, (ArmFeaturesEnum)~0x0));
+}
+
+TEST(CpuinfoArmTest, ODroidFromCpuInfo)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(processor       : 0
+model name      : ARMv7 Processor rev 3 (v71)
+BogoMIPS        : 120.00
+Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae
+CPU implementer : 0x41
+CPU architecture: 7
+CPU variant     : 0x2
+CPU part        : 0xc0f
+CPU revision    : 3)");
+    const auto info = GetArmInfo();
+    EXPECT_EQ(info.implementer, 0x41);
+    EXPECT_EQ(info.variant, 0x2);
+    EXPECT_EQ(info.part, 0xc0f);
+    EXPECT_EQ(info.revision, 3);
+    EXPECT_EQ(info.architecture, 7);
+
+    EXPECT_FALSE(info.features.swp);
+    EXPECT_TRUE(info.features.half);
+    EXPECT_TRUE(info.features.thumb);
+    EXPECT_FALSE(info.features._26bit);
+    EXPECT_TRUE(info.features.fastmult);
+    EXPECT_FALSE(info.features.fpa);
+    EXPECT_TRUE(info.features.vfp);
+    EXPECT_TRUE(info.features.edsp);
+    EXPECT_FALSE(info.features.java);
+    EXPECT_FALSE(info.features.iwmmxt);
+    EXPECT_FALSE(info.features.crunch);
+    EXPECT_FALSE(info.features.thumbee);
+    EXPECT_TRUE(info.features.neon);
+    EXPECT_TRUE(info.features.vfpv3);
+    EXPECT_FALSE(info.features.vfpv3d16);
+    EXPECT_TRUE(info.features.tls);
+    EXPECT_TRUE(info.features.vfpv4);
+    EXPECT_TRUE(info.features.idiva);
+    EXPECT_TRUE(info.features.idivt);
+    EXPECT_TRUE(info.features.vfpd32);
+    EXPECT_TRUE(info.features.lpae);
+    EXPECT_FALSE(info.features.evtstrm);
+    EXPECT_FALSE(info.features.aes);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+    EXPECT_FALSE(info.features.crc32);
+}
+
+// Linux test-case
+TEST(CpuinfoArmTest, RaspberryPiZeroFromCpuInfo)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(processor       : 0
+model name      : ARMv6-compatible processor rev 7 (v6l)
+BogoMIPS        : 697.95
+Features        : half thumb fastmult vfp edsp java tls
+CPU implementer : 0x41
+CPU architecture: 7
+CPU variant     : 0x0
+CPU part        : 0xb76
+CPU revision    : 7
+Hardware        : BCM2835
+Revision        : 9000c1
+Serial          : 000000006cd946f3)");
+    const auto info = GetArmInfo();
+    EXPECT_EQ(info.implementer, 0x41);
+    EXPECT_EQ(info.variant, 0x0);
+    EXPECT_EQ(info.part, 0xb76);
+    EXPECT_EQ(info.revision, 7);
+    EXPECT_EQ(info.architecture, 6);
+
+    EXPECT_FALSE(info.features.swp);
+    EXPECT_TRUE(info.features.half);
+    EXPECT_TRUE(info.features.thumb);
+    EXPECT_FALSE(info.features._26bit);
+    EXPECT_TRUE(info.features.fastmult);
+    EXPECT_FALSE(info.features.fpa);
+    EXPECT_TRUE(info.features.vfp);
+    EXPECT_TRUE(info.features.edsp);
+    EXPECT_TRUE(info.features.java);
+    EXPECT_FALSE(info.features.iwmmxt);
+    EXPECT_FALSE(info.features.crunch);
+    EXPECT_FALSE(info.features.thumbee);
+    EXPECT_FALSE(info.features.neon);
+    EXPECT_FALSE(info.features.vfpv3);
+    EXPECT_FALSE(info.features.vfpv3d16);
+    EXPECT_TRUE(info.features.tls);
+    EXPECT_FALSE(info.features.vfpv4);
+    EXPECT_FALSE(info.features.idiva);
+    EXPECT_FALSE(info.features.idivt);
+    EXPECT_FALSE(info.features.vfpd32);
+    EXPECT_FALSE(info.features.lpae);
+    EXPECT_FALSE(info.features.evtstrm);
+    EXPECT_FALSE(info.features.aes);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+    EXPECT_FALSE(info.features.crc32);
+}
+
+TEST(CpuinfoArmTest, MarvellArmadaFromCpuInfo)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(processor       : 0
+model name      : ARMv7 Processor rev 1 (v7l)
+BogoMIPS        : 50.00
+Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
+CPU implementer : 0x41
+CPU architecture: 7
+CPU variant     : 0x4
+CPU part        : 0xc09
+CPU revision    : 1
+processor       : 1
+model name      : ARMv7 Processor rev 1 (v7l)
+BogoMIPS        : 50.00
+Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
+CPU implementer : 0x41
+CPU architecture: 7
+CPU variant     : 0x4
+CPU part        : 0xc09
+CPU revision    : 1
+Hardware        : Marvell Armada 380/385 (Device Tree)
+Revision        : 0000
+Serial          : 0000000000000000)");
+    const auto info = GetArmInfo();
+    EXPECT_EQ(info.implementer, 0x41);
+    EXPECT_EQ(info.variant, 0x4);
+    EXPECT_EQ(info.part, 0xc09);
+    EXPECT_EQ(info.revision, 1);
+    EXPECT_EQ(info.architecture, 7);
+
+    EXPECT_FALSE(info.features.swp);
+    EXPECT_TRUE(info.features.half);
+    EXPECT_TRUE(info.features.thumb);
+    EXPECT_FALSE(info.features._26bit);
+    EXPECT_TRUE(info.features.fastmult);
+    EXPECT_FALSE(info.features.fpa);
+    EXPECT_TRUE(info.features.vfp);
+    EXPECT_TRUE(info.features.edsp);
+    EXPECT_FALSE(info.features.java);
+    EXPECT_FALSE(info.features.iwmmxt);
+    EXPECT_FALSE(info.features.crunch);
+    EXPECT_FALSE(info.features.thumbee);
+    EXPECT_TRUE(info.features.neon);
+    EXPECT_TRUE(info.features.vfpv3);
+    EXPECT_FALSE(info.features.vfpv3d16);
+    EXPECT_TRUE(info.features.tls);
+    EXPECT_FALSE(info.features.vfpv4);
+    EXPECT_FALSE(info.features.idiva);
+    EXPECT_FALSE(info.features.idivt);
+    EXPECT_TRUE(info.features.vfpd32);
+    EXPECT_FALSE(info.features.lpae);
+    EXPECT_FALSE(info.features.evtstrm);
+    EXPECT_FALSE(info.features.aes);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+    EXPECT_FALSE(info.features.crc32);
+}
+
+// Android test-case
+// http://code.google.com/p/android/issues/detail?id=10812
+TEST(CpuinfoArmTest, InvalidArmv7)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(Processor       : ARMv6-compatible processor rev 6 (v6l)
+BogoMIPS        : 199.47
+Features        : swp half thumb fastmult vfp edsp java
+CPU implementer : 0x41
+CPU architecture: 7
+CPU variant     : 0x0
+CPU part        : 0xb76
+CPU revision    : 6
+Hardware        : SPICA
+Revision        : 0020
+Serial          : 33323613546d00ec )");
+    const auto info = GetArmInfo();
+    EXPECT_EQ(info.architecture, 6);
+
+    EXPECT_TRUE(info.features.swp);
+    EXPECT_TRUE(info.features.half);
+    EXPECT_TRUE(info.features.thumb);
+    EXPECT_FALSE(info.features._26bit);
+    EXPECT_TRUE(info.features.fastmult);
+    EXPECT_FALSE(info.features.fpa);
+    EXPECT_TRUE(info.features.vfp);
+    EXPECT_TRUE(info.features.edsp);
+    EXPECT_TRUE(info.features.java);
+    EXPECT_FALSE(info.features.iwmmxt);
+    EXPECT_FALSE(info.features.crunch);
+    EXPECT_FALSE(info.features.thumbee);
+    EXPECT_FALSE(info.features.neon);
+    EXPECT_FALSE(info.features.vfpv3);
+    EXPECT_FALSE(info.features.vfpv3d16);
+    EXPECT_FALSE(info.features.tls);
+    EXPECT_FALSE(info.features.vfpv4);
+    EXPECT_FALSE(info.features.idiva);
+    EXPECT_FALSE(info.features.idivt);
+    EXPECT_FALSE(info.features.vfpd32);
+    EXPECT_FALSE(info.features.lpae);
+    EXPECT_FALSE(info.features.evtstrm);
+    EXPECT_FALSE(info.features.aes);
+    EXPECT_FALSE(info.features.pmull);
+    EXPECT_FALSE(info.features.sha1);
+    EXPECT_FALSE(info.features.sha2);
+    EXPECT_FALSE(info.features.crc32);
+}
+
+// Android test-case
+// https://crbug.com/341598.
+TEST(CpuinfoArmTest, InvalidNeon)
+{
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(Processor: ARMv7 Processory rev 0 (v71)
+processor: 0
+BogoMIPS: 13.50
+Processor: 1
+BogoMIPS: 13.50
+Features: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt
+CPU implementer : 0x51
+CPU architecture: 7
+CPU variant: 0x1
+CPU part: 0x04d
+CPU revision: 0
+Hardware: SAMSUNG M2
+Revision: 0010
+Serial: 00001e030000354e)");
+    const auto info = GetArmInfo();
+    EXPECT_TRUE(info.features.swp);
+    EXPECT_FALSE(info.features.neon);
+}
+
+// The Nexus 4 (Qualcomm Krait) kernel configuration forgets to report IDIV
+// support.
+TEST(CpuinfoArmTest, Nexus4_0x510006f2)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(CPU implementer	: 0x51
+CPU architecture: 7
+CPU variant	: 0x0
+CPU part	: 0x6f
+CPU revision	: 2)");
+    const auto info = GetArmInfo();
+    EXPECT_TRUE(info.features.idiva);
+    EXPECT_TRUE(info.features.idivt);
+
+    EXPECT_EQ(GetArmCpuId(&info), 0x510006f2);
+}
+
+// The Nexus 4 (Qualcomm Krait) kernel configuration forgets to report IDIV
+// support.
+TEST(CpuinfoArmTest, Nexus4_0x510006f3)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(CPU implementer	: 0x51
+CPU architecture: 7
+CPU variant	: 0x0
+CPU part	: 0x6f
+CPU revision	: 3)");
+    const auto info = GetArmInfo();
+    EXPECT_TRUE(info.features.idiva);
+    EXPECT_TRUE(info.features.idivt);
+
+    EXPECT_EQ(GetArmCpuId(&info), 0x510006f3);
+}
+
+// The emulator-specific Android 4.2 kernel fails to report support for the
+// 32-bit ARM IDIV instruction. Technically, this is a feature of the virtual
+// CPU implemented by the emulator.
+TEST(CpuinfoArmTest, EmulatorSpecificIdiv)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(Processor	: ARMv7 Processor rev 0 (v7l)
+BogoMIPS	: 629.14
+Features	: swp half thumb fastmult vfp edsp neon vfpv3
+CPU implementer	: 0x41
+CPU architecture: 7
+CPU variant	: 0x0
+CPU part	: 0xc08
+CPU revision	: 0
+Hardware	: Goldfish
+Revision	: 0000
+Serial		: 0000000000000000)");
+    const auto info = GetArmInfo();
+    EXPECT_TRUE(info.features.idiva);
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/cpuinfo_mips_test.cc

@@ -0,0 +1,119 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_mips.h"
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "hwcaps_for_testing.h"
+#include "internal/stack_line_reader.h"
+#include "internal/string_view.h"
+
+namespace cpu_features
+{
+namespace
+{
+void DisableHardwareCapabilities() { SetHardwareCapabilities(0, 0); }
+
+TEST(CpuinfoMipsTest, FromHardwareCapBoth)
+{
+    SetHardwareCapabilities(MIPS_HWCAP_MSA | MIPS_HWCAP_R6, 0);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetMipsInfo();
+    EXPECT_TRUE(info.features.msa);
+    EXPECT_FALSE(info.features.eva);
+    EXPECT_TRUE(info.features.r6);
+}
+
+TEST(CpuinfoMipsTest, FromHardwareCapOnlyOne)
+{
+    SetHardwareCapabilities(MIPS_HWCAP_MSA, 0);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetMipsInfo();
+    EXPECT_TRUE(info.features.msa);
+    EXPECT_FALSE(info.features.eva);
+}
+
+TEST(CpuinfoMipsTest, Ci40)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(system type : IMG Pistachio SoC (B0)
+machine : IMG Marduk – Ci40 with cc2520
+processor : 0
+cpu model : MIPS interAptiv (multi) V2.0 FPU V0.0
+BogoMIPS : 363.72
+wait instruction : yes
+microsecond timers : yes
+tlb_entries : 64
+extra interrupt vector : yes
+hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
+isa : mips1 mips2 mips32r1 mips32r2
+ASEs implemented : mips16 dsp mt eva
+shadow register sets : 1
+kscratch registers : 0
+package : 0
+core : 0
+VCED exceptions : not available
+VCEI exceptions : not available
+VPE : 0
+)");
+    const auto info = GetMipsInfo();
+    EXPECT_FALSE(info.features.msa);
+    EXPECT_TRUE(info.features.eva);
+}
+
+TEST(CpuinfoMipsTest, AR7161)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(system type             : Atheros AR7161 rev 2
+machine                 : NETGEAR WNDR3700/WNDR3800/WNDRMAC
+processor               : 0
+cpu model               : MIPS 24Kc V7.4
+BogoMIPS                : 452.19
+wait instruction        : yes
+microsecond timers      : yes
+tlb_entries             : 16
+extra interrupt vector  : yes
+hardware watchpoint     : yes, count: 4, address/irw mask: [0x0000, 0x0f98, 0x0f78, 0x0df8]
+ASEs implemented        : mips16
+shadow register sets    : 1
+kscratch registers      : 0
+core                    : 0
+VCED exceptions         : not available
+VCEI exceptions         : not available
+)");
+    const auto info = GetMipsInfo();
+    EXPECT_FALSE(info.features.msa);
+    EXPECT_FALSE(info.features.eva);
+}
+
+TEST(CpuinfoMipsTest, Goldfish)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(system type		: MIPS-Goldfish
+Hardware		: goldfish
+Revison		: 1
+processor		: 0
+cpu model		: MIPS 24Kc V0.0  FPU V0.0
+BogoMIPS		: 1042.02
+wait instruction	: yes
+microsecond timers	: yes
+tlb_entries		: 16
+extra interrupt vector	: yes
+hardware watchpoint	: yes, count: 1, address/irw mask: [0x0ff8]
+ASEs implemented	:
+shadow register sets	: 1
+core			: 0
+VCED exceptions		: not available
+VCEI exceptions		: not available
+)");
+    const auto info = GetMipsInfo();
+    EXPECT_FALSE(info.features.msa);
+    EXPECT_FALSE(info.features.eva);
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/cpuinfo_ppc_test.cc

@@ -0,0 +1,107 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_ppc.h"
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "hwcaps_for_testing.h"
+#include "internal/string_view.h"
+
+namespace cpu_features
+{
+namespace
+{
+void DisableHardwareCapabilities() { SetHardwareCapabilities(0, 0); }
+
+TEST(CpustringsPPCTest, FromHardwareCap)
+{
+    SetHardwareCapabilities(PPC_FEATURE_HAS_FPU | PPC_FEATURE_HAS_VSX,
+        PPC_FEATURE2_ARCH_3_00);
+    GetEmptyFilesystem();  // disabling /proc/cpuinfo
+    const auto info = GetPPCInfo();
+    EXPECT_TRUE(info.features.fpu);
+    EXPECT_FALSE(info.features.mmu);
+    EXPECT_TRUE(info.features.vsx);
+    EXPECT_TRUE(info.features.arch300);
+    EXPECT_FALSE(info.features.power4);
+    EXPECT_FALSE(info.features.altivec);
+    EXPECT_FALSE(info.features.vcrypto);
+    EXPECT_FALSE(info.features.htm);
+}
+
+TEST(CpustringsPPCTest, Blade)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(processor       : 14
+cpu             : POWER7 (architected), altivec supported
+clock           : 3000.000000MHz
+revision        : 2.1 (pvr 003f 0201)
+processor       : 15
+cpu             : POWER7 (architected), altivec supported
+clock           : 3000.000000MHz
+revision        : 2.1 (pvr 003f 0201)
+timebase        : 512000000
+platform        : pSeries
+model           : IBM,8406-70Y
+machine         : CHRP IBM,8406-70Y)");
+    SetPlatformTypes("power7", "power8");
+    const auto strings = GetPPCPlatformStrings();
+    ASSERT_STREQ(strings.platform, "pSeries");
+    ASSERT_STREQ(strings.model, "IBM,8406-70Y");
+    ASSERT_STREQ(strings.machine, "CHRP IBM,8406-70Y");
+    ASSERT_STREQ(strings.cpu, "POWER7 (architected), altivec supported");
+    ASSERT_STREQ(strings.type.platform, "power7");
+    ASSERT_STREQ(strings.type.base_platform, "power8");
+}
+
+TEST(CpustringsPPCTest, Firestone)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(processor       : 126
+cpu             : POWER8 (raw), altivec supported
+clock           : 2061.000000MHz
+revision        : 2.0 (pvr 004d 0200)
+processor       : 127
+cpu             : POWER8 (raw), altivec supported
+clock           : 2061.000000MHz
+revision        : 2.0 (pvr 004d 0200)
+timebase        : 512000000
+platform        : PowerNV
+model           : 8335-GTA
+machine         : PowerNV 8335-GTA
+firmware        : OPAL v3)");
+    const auto strings = GetPPCPlatformStrings();
+    ASSERT_STREQ(strings.platform, "PowerNV");
+    ASSERT_STREQ(strings.model, "8335-GTA");
+    ASSERT_STREQ(strings.machine, "PowerNV 8335-GTA");
+    ASSERT_STREQ(strings.cpu, "POWER8 (raw), altivec supported");
+}
+
+TEST(CpustringsPPCTest, w8)
+{
+    DisableHardwareCapabilities();
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo",
+        R"(processor       : 143
+cpu             : POWER9, altivec supported
+clock           : 2300.000000MHz
+revision        : 2.2 (pvr 004e 1202)
+timebase        : 512000000
+platform        : PowerNV
+model           : 0000000000000000
+machine         : PowerNV 0000000000000000
+firmware        : OPAL
+MMU             : Radix)");
+    const auto strings = GetPPCPlatformStrings();
+    ASSERT_STREQ(strings.platform, "PowerNV");
+    ASSERT_STREQ(strings.model, "0000000000000000");
+    ASSERT_STREQ(strings.machine, "PowerNV 0000000000000000");
+    ASSERT_STREQ(strings.cpu, "POWER9, altivec supported");
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/cpuinfo_x86_test.cc

@@ -0,0 +1,544 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "cpuinfo_x86.h"
+#include <cassert>
+#include <cstdio>
+#include <map>
+#include <set>
+#if defined(CPU_FEATURES_OS_WINDOWS)
+#include <windows.h>  // IsProcessorFeaturePresent
+#endif                // CPU_FEATURES_OS_WINDOWS
+
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "internal/cpuid_x86.h"
+
+namespace cpu_features
+{
+class FakeCpu
+{
+public:
+    Leaf GetCpuidLeaf(uint32_t leaf_id, int ecx) const
+    {
+        const auto itr = cpuid_leaves_.find(std::make_pair(leaf_id, ecx));
+        if (itr != cpuid_leaves_.end())
+            {
+                return itr->second;
+            }
+        return {0, 0, 0, 0};
+    }
+
+    uint32_t GetXCR0Eax() const { return xcr0_eax_; }
+
+    void SetLeaves(std::map<std::pair<uint32_t, int>, Leaf> configuration)
+    {
+        cpuid_leaves_ = std::move(configuration);
+    }
+
+    void SetOsBackupsExtendedRegisters(bool os_backups_extended_registers)
+    {
+        xcr0_eax_ = os_backups_extended_registers ? -1 : 0;
+    }
+
+#if defined(CPU_FEATURES_OS_DARWIN)
+    bool GetDarwinSysCtlByName(std::string name) const
+    {
+        return darwin_sysctlbyname_.count(name);
+    }
+
+    void SetDarwinSysCtlByName(std::string name)
+    {
+        darwin_sysctlbyname_.insert(name);
+    }
+#endif  // CPU_FEATURES_OS_DARWIN
+
+#if defined(CPU_FEATURES_OS_WINDOWS)
+    bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature)
+    {
+        return windows_isprocessorfeaturepresent_.count(ProcessorFeature);
+    }
+
+    void SetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature)
+    {
+        windows_isprocessorfeaturepresent_.insert(ProcessorFeature);
+    }
+#endif  // CPU_FEATURES_OS_WINDOWS
+
+private:
+    std::map<std::pair<uint32_t, int>, Leaf> cpuid_leaves_;
+#if defined(CPU_FEATURES_OS_DARWIN)
+    std::set<std::string> darwin_sysctlbyname_;
+#endif  // CPU_FEATURES_OS_DARWIN
+#if defined(CPU_FEATURES_OS_WINDOWS)
+    std::set<DWORD> windows_isprocessorfeaturepresent_;
+#endif  // CPU_FEATURES_OS_WINDOWS
+    uint32_t xcr0_eax_;
+};
+
+FakeCpu* g_fake_cpu = nullptr;
+
+extern "C" Leaf GetCpuidLeaf(uint32_t leaf_id, int ecx)
+{
+    return g_fake_cpu->GetCpuidLeaf(leaf_id, ecx);
+}
+
+extern "C" uint32_t GetXCR0Eax(void) { return g_fake_cpu->GetXCR0Eax(); }
+
+#if defined(CPU_FEATURES_OS_DARWIN)
+extern "C" bool GetDarwinSysCtlByName(const char* name)
+{
+    return g_fake_cpu->GetDarwinSysCtlByName(name);
+}
+#endif  // CPU_FEATURES_OS_DARWIN
+
+#if defined(CPU_FEATURES_OS_WINDOWS)
+extern "C" bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature)
+{
+    return g_fake_cpu->GetWindowsIsProcessorFeaturePresent(ProcessorFeature);
+}
+#endif  // CPU_FEATURES_OS_WINDOWS
+
+namespace
+{
+class CpuidX86Test : public ::testing::Test
+{
+protected:
+    void SetUp() override { g_fake_cpu = new FakeCpu(); }
+    void TearDown() override { delete g_fake_cpu; }
+};
+
+TEST_F(CpuidX86Test, SandyBridge)
+{
+    g_fake_cpu->SetOsBackupsExtendedRegisters(true);
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x0000000D, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000206A6, 0x00100800, 0x1F9AE3BF, 0xBFEBFBFF}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+    });
+    const auto info = GetX86Info();
+    EXPECT_STREQ(info.vendor, "GenuineIntel");
+    EXPECT_EQ(info.family, 0x06);
+    EXPECT_EQ(info.model, 0x02A);
+    EXPECT_EQ(info.stepping, 0x06);
+    // Leaf 7 is zeroed out so none of the Leaf 7 flags are set.
+    const auto features = info.features;
+    EXPECT_FALSE(features.erms);
+    EXPECT_FALSE(features.avx2);
+    EXPECT_FALSE(features.avx512f);
+    EXPECT_FALSE(features.avx512cd);
+    EXPECT_FALSE(features.avx512er);
+    EXPECT_FALSE(features.avx512pf);
+    EXPECT_FALSE(features.avx512bw);
+    EXPECT_FALSE(features.avx512dq);
+    EXPECT_FALSE(features.avx512vl);
+    EXPECT_FALSE(features.avx512ifma);
+    EXPECT_FALSE(features.avx512vbmi);
+    EXPECT_FALSE(features.avx512vbmi2);
+    EXPECT_FALSE(features.avx512vnni);
+    EXPECT_FALSE(features.avx512bitalg);
+    EXPECT_FALSE(features.avx512vpopcntdq);
+    EXPECT_FALSE(features.avx512_4vnniw);
+    EXPECT_FALSE(features.avx512_4fmaps);
+    // All old cpu features should be set.
+    EXPECT_TRUE(features.aes);
+    EXPECT_TRUE(features.ssse3);
+    EXPECT_TRUE(features.sse4_1);
+    EXPECT_TRUE(features.sse4_2);
+    EXPECT_TRUE(features.avx);
+    EXPECT_FALSE(features.sha);
+    EXPECT_TRUE(features.popcnt);
+    EXPECT_FALSE(features.movbe);
+    EXPECT_FALSE(features.rdrnd);
+}
+
+const int KiB = 1024;
+const int MiB = 1024 * KiB;
+
+TEST_F(CpuidX86Test, SandyBridgeTestOsSupport)
+{
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x0000000D, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000206A6, 0x00100800, 0x1F9AE3BF, 0xBFEBFBFF}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+    });
+    // avx is disabled if os does not support backing up ymm registers.
+    g_fake_cpu->SetOsBackupsExtendedRegisters(false);
+    EXPECT_FALSE(GetX86Info().features.avx);
+    // avx is disabled if os does not support backing up ymm registers.
+    g_fake_cpu->SetOsBackupsExtendedRegisters(true);
+    EXPECT_TRUE(GetX86Info().features.avx);
+}
+
+TEST_F(CpuidX86Test, SkyLake)
+{
+    g_fake_cpu->SetOsBackupsExtendedRegisters(true);
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x029C67AF, 0x00000000, 0x00000000}},
+    });
+    const auto info = GetX86Info();
+    EXPECT_STREQ(info.vendor, "GenuineIntel");
+    EXPECT_EQ(info.family, 0x06);
+    EXPECT_EQ(info.model, 0x04E);
+    EXPECT_EQ(info.stepping, 0x03);
+    EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::INTEL_SKL);
+}
+
+TEST_F(CpuidX86Test, Branding)
+{
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x029C67AF, 0x00000000, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000121, 0x2C100000}},
+        {{0x80000002, 0}, Leaf{0x65746E49, 0x2952286C, 0x726F4320, 0x4D542865}},
+        {{0x80000003, 0}, Leaf{0x37692029, 0x3035362D, 0x43205530, 0x40205550}},
+        {{0x80000004, 0}, Leaf{0x352E3220, 0x7A484730, 0x00000000, 0x00000000}},
+    });
+    char brand_string[49];
+    FillX86BrandString(brand_string);
+    EXPECT_STREQ(brand_string, "Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz");
+}
+
+TEST_F(CpuidX86Test, KabyLakeCache)
+{
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
+        {{0x00000004, 0}, Leaf{0x1C004121, 0x01C0003F, 0x0000003F, 0x00000000}},
+        {{0x00000004, 1}, Leaf{0x1C004122, 0x01C0003F, 0x0000003F, 0x00000000}},
+        {{0x00000004, 2}, Leaf{0x1C004143, 0x00C0003F, 0x000003FF, 0x00000000}},
+        {{0x00000004, 3}, Leaf{0x1C03C163, 0x02C0003F, 0x00001FFF, 0x00000002}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x029C67AF, 0x00000000, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000121, 0x2C100000}},
+        {{0x80000002, 0}, Leaf{0x65746E49, 0x2952286C, 0x726F4320, 0x4D542865}},
+        {{0x80000003, 0}, Leaf{0x37692029, 0x3035362D, 0x43205530, 0x40205550}},
+    });
+    const auto info = GetX86CacheInfo();
+    EXPECT_EQ(info.size, 4);
+    EXPECT_EQ(info.levels[0].level, 1);
+    EXPECT_EQ(info.levels[0].cache_type, 1);
+    EXPECT_EQ(info.levels[0].cache_size, 32 * KiB);
+    EXPECT_EQ(info.levels[0].ways, 8);
+    EXPECT_EQ(info.levels[0].line_size, 64);
+    EXPECT_EQ(info.levels[0].tlb_entries, 64);
+    EXPECT_EQ(info.levels[0].partitioning, 1);
+
+    EXPECT_EQ(info.levels[1].level, 1);
+    EXPECT_EQ(info.levels[1].cache_type, 2);
+    EXPECT_EQ(info.levels[1].cache_size, 32 * KiB);
+    EXPECT_EQ(info.levels[1].ways, 8);
+    EXPECT_EQ(info.levels[1].line_size, 64);
+    EXPECT_EQ(info.levels[1].tlb_entries, 64);
+    EXPECT_EQ(info.levels[1].partitioning, 1);
+
+    EXPECT_EQ(info.levels[2].level, 2);
+    EXPECT_EQ(info.levels[2].cache_type, 3);
+    EXPECT_EQ(info.levels[2].cache_size, 256 * KiB);
+    EXPECT_EQ(info.levels[2].ways, 4);
+    EXPECT_EQ(info.levels[2].line_size, 64);
+    EXPECT_EQ(info.levels[2].tlb_entries, 1024);
+    EXPECT_EQ(info.levels[2].partitioning, 1);
+
+    EXPECT_EQ(info.levels[3].level, 3);
+    EXPECT_EQ(info.levels[3].cache_type, 3);
+    EXPECT_EQ(info.levels[3].cache_size, 6 * MiB);
+    EXPECT_EQ(info.levels[3].ways, 12);
+    EXPECT_EQ(info.levels[3].line_size, 64);
+    EXPECT_EQ(info.levels[3].tlb_entries, 8192);
+    EXPECT_EQ(info.levels[3].partitioning, 1);
+}
+
+TEST_F(CpuidX86Test, HSWCache)
+{
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
+        {{0x00000004, 0}, Leaf{0x1C004121, 0x01C0003F, 0x0000003F, 0x00000000}},
+        {{0x00000004, 1}, Leaf{0x1C004122, 0x01C0003F, 0x0000003F, 0x00000000}},
+        {{0x00000004, 2}, Leaf{0x1C004143, 0x01C0003F, 0x000001FF, 0x00000000}},
+        {{0x00000004, 3}, Leaf{0x1C03C163, 0x02C0003F, 0x00001FFF, 0x00000006}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x029C67AF, 0x00000000, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000121, 0x2C100000}},
+        {{0x80000002, 0}, Leaf{0x65746E49, 0x2952286C, 0x726F4320, 0x4D542865}},
+        {{0x80000003, 0}, Leaf{0x37692029, 0x3035362D, 0x43205530, 0x40205550}},
+    });
+    const auto info = GetX86CacheInfo();
+    EXPECT_EQ(info.size, 4);
+    EXPECT_EQ(info.levels[0].level, 1);
+    EXPECT_EQ(info.levels[0].cache_type, 1);
+    EXPECT_EQ(info.levels[0].cache_size, 32 * KiB);
+    EXPECT_EQ(info.levels[0].ways, 8);
+    EXPECT_EQ(info.levels[0].line_size, 64);
+    EXPECT_EQ(info.levels[0].tlb_entries, 64);
+    EXPECT_EQ(info.levels[0].partitioning, 1);
+
+    EXPECT_EQ(info.levels[1].level, 1);
+    EXPECT_EQ(info.levels[1].cache_type, 2);
+    EXPECT_EQ(info.levels[1].cache_size, 32 * KiB);
+    EXPECT_EQ(info.levels[1].ways, 8);
+    EXPECT_EQ(info.levels[1].line_size, 64);
+    EXPECT_EQ(info.levels[1].tlb_entries, 64);
+    EXPECT_EQ(info.levels[1].partitioning, 1);
+
+    EXPECT_EQ(info.levels[2].level, 2);
+    EXPECT_EQ(info.levels[2].cache_type, 3);
+    EXPECT_EQ(info.levels[2].cache_size, 256 * KiB);
+    EXPECT_EQ(info.levels[2].ways, 8);
+    EXPECT_EQ(info.levels[2].line_size, 64);
+    EXPECT_EQ(info.levels[2].tlb_entries, 512);
+    EXPECT_EQ(info.levels[2].partitioning, 1);
+
+    EXPECT_EQ(info.levels[3].level, 3);
+    EXPECT_EQ(info.levels[3].cache_type, 3);
+    EXPECT_EQ(info.levels[3].cache_size, 6 * MiB);
+    EXPECT_EQ(info.levels[3].ways, 12);
+    EXPECT_EQ(info.levels[3].line_size, 64);
+    EXPECT_EQ(info.levels[3].tlb_entries, 8192);
+    EXPECT_EQ(info.levels[3].partitioning, 1);
+}
+
+// http://users.atw.hu/instlatx64/AuthenticAMD0630F81_K15_Godavari_CPUID.txt
+TEST_F(CpuidX86Test, AMD_K15)
+{
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x0000000D, 0x68747541, 0x444D4163, 0x69746E65}},
+        {{0x00000001, 0}, Leaf{0x00630F81, 0x00040800, 0x3E98320B, 0x178BFBFF}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x8000001E, 0x68747541, 0x444D4163, 0x69746E65}},
+        {{0x80000001, 0}, Leaf{0x00630F81, 0x10000000, 0x0FEBBFFF, 0x2FD3FBFF}},
+        {{0x80000002, 0}, Leaf{0x20444D41, 0x372D3841, 0x4B303736, 0x64615220}},
+        {{0x80000003, 0}, Leaf{0x206E6F65, 0x202C3752, 0x43203031, 0x75706D6F}},
+        {{0x80000004, 0}, Leaf{0x43206574, 0x7365726F, 0x2B433420, 0x00204736}},
+        {{0x80000005, 0}, Leaf{0xFF40FF18, 0xFF40FF30, 0x10040140, 0x60030140}},
+    });
+    const auto info = GetX86Info();
+
+    EXPECT_STREQ(info.vendor, "AuthenticAMD");
+    EXPECT_EQ(info.family, 0x15);
+    EXPECT_EQ(info.model, 0x38);
+    EXPECT_EQ(info.stepping, 0x01);
+    EXPECT_EQ(GetX86Microarchitecture(&info),
+        X86Microarchitecture::AMD_BULLDOZER);
+
+    char brand_string[49];
+    FillX86BrandString(brand_string);
+    EXPECT_STREQ(brand_string, "AMD A8-7670K Radeon R7, 10 Compute Cores 4C+6G ");
+}
+
+// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel00106A1_Nehalem_CPUID.txt
+TEST_F(CpuidX86Test, Nehalem)
+{
+    // Pre AVX cpus don't have xsave
+    g_fake_cpu->SetOsBackupsExtendedRegisters(false);
+#if defined(CPU_FEATURES_OS_WINDOWS)
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_XMMI_INSTRUCTIONS_AVAILABLE);
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_XMMI64_INSTRUCTIONS_AVAILABLE);
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_SSE3_INSTRUCTIONS_AVAILABLE);
+#endif  // CPU_FEATURES_OS_WINDOWS
+#if defined(CPU_FEATURES_OS_DARWIN)
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse2");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse3");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.supplementalsse3");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_1");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_2");
+#endif  // CPU_FEATURES_OS_DARWIN
+#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(processor       :
+flags           : fpu mmx sse sse2 sse3 ssse3 sse4_1 sse4_2
+)");
+#endif  // CPU_FEATURES_OS_LINUX_OR_ANDROID
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x0000000B, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x000106A2, 0x00100800, 0x00BCE3BD, 0xBFEBFBFF}},
+        {{0x00000002, 0}, Leaf{0x55035A01, 0x00F0B0E3, 0x00000000, 0x09CA212C}},
+        {{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x00000004, 0}, Leaf{0x1C004121, 0x01C0003F, 0x0000003F, 0x00000000}},
+        {{0x00000004, 0}, Leaf{0x1C004122, 0x00C0003F, 0x0000007F, 0x00000000}},
+        {{0x00000004, 0}, Leaf{0x1C004143, 0x01C0003F, 0x000001FF, 0x00000000}},
+        {{0x00000004, 0}, Leaf{0x1C03C163, 0x03C0003F, 0x00000FFF, 0x00000002}},
+        {{0x00000005, 0}, Leaf{0x00000040, 0x00000040, 0x00000003, 0x00021120}},
+        {{0x00000006, 0}, Leaf{0x00000001, 0x00000002, 0x00000001, 0x00000000}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x00000008, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x00000009, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x0000000A, 0}, Leaf{0x07300403, 0x00000000, 0x00000000, 0x00000603}},
+        {{0x0000000B, 0}, Leaf{0x00000001, 0x00000001, 0x00000100, 0x00000000}},
+        {{0x0000000B, 0}, Leaf{0x00000004, 0x00000002, 0x00000201, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000001, 0x28100000}},
+        {{0x80000002, 0}, Leaf{0x756E6547, 0x20656E69, 0x65746E49, 0x2952286C}},
+        {{0x80000003, 0}, Leaf{0x55504320, 0x20202020, 0x20202020, 0x40202020}},
+        {{0x80000004, 0}, Leaf{0x30303020, 0x20402030, 0x37382E31, 0x007A4847}},
+        {{0x80000005, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000006, 0}, Leaf{0x00000000, 0x00000000, 0x01006040, 0x00000000}},
+        {{0x80000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000100}},
+        {{0x80000008, 0}, Leaf{0x00003028, 0x00000000, 0x00000000, 0x00000000}},
+    });
+    const auto info = GetX86Info();
+
+    EXPECT_STREQ(info.vendor, "GenuineIntel");
+    EXPECT_EQ(info.family, 0x06);
+    EXPECT_EQ(info.model, 0x1A);
+    EXPECT_EQ(info.stepping, 0x02);
+    EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::INTEL_NHM);
+
+    char brand_string[49];
+    FillX86BrandString(brand_string);
+    EXPECT_STREQ(brand_string, "Genuine Intel(R) CPU           @ 0000 @ 1.87GHz");
+
+    EXPECT_TRUE(info.features.sse);
+    EXPECT_TRUE(info.features.sse2);
+    EXPECT_TRUE(info.features.sse3);
+#ifndef CPU_FEATURES_OS_WINDOWS
+    // Currently disabled on Windows as IsProcessorFeaturePresent do not support
+    // feature detection > sse3.
+    EXPECT_TRUE(info.features.ssse3);
+    EXPECT_TRUE(info.features.sse4_1);
+    EXPECT_TRUE(info.features.sse4_2);
+#endif  // CPU_FEATURES_OS_WINDOWS
+}
+
+// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel0030673_Silvermont3_CPUID.txt
+TEST_F(CpuidX86Test, Atom)
+{
+    // Pre AVX cpus don't have xsave
+    g_fake_cpu->SetOsBackupsExtendedRegisters(false);
+#if defined(CPU_FEATURES_OS_WINDOWS)
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_XMMI_INSTRUCTIONS_AVAILABLE);
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_XMMI64_INSTRUCTIONS_AVAILABLE);
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_SSE3_INSTRUCTIONS_AVAILABLE);
+#endif  // CPU_FEATURES_OS_WINDOWS
+#if defined(CPU_FEATURES_OS_DARWIN)
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse2");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse3");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.supplementalsse3");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_1");
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_2");
+#endif  // CPU_FEATURES_OS_DARWIN
+#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(
+flags           : fpu mmx sse sse2 sse3 ssse3 sse4_1 sse4_2
+)");
+#endif  // CPU_FEATURES_OS_LINUX_OR_ANDROID
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x0000000B, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x00030673, 0x00100800, 0x41D8E3BF, 0xBFEBFBFF}},
+        {{0x00000002, 0}, Leaf{0x61B3A001, 0x0000FFC2, 0x00000000, 0x00000000}},
+        {{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x00000004, 0}, Leaf{0x1C000121, 0x0140003F, 0x0000003F, 0x00000001}},
+        {{0x00000004, 1}, Leaf{0x1C000122, 0x01C0003F, 0x0000003F, 0x00000001}},
+        {{0x00000004, 2}, Leaf{0x1C00C143, 0x03C0003F, 0x000003FF, 0x00000001}},
+        {{0x00000005, 0}, Leaf{0x00000040, 0x00000040, 0x00000003, 0x33000020}},
+        {{0x00000006, 0}, Leaf{0x00000005, 0x00000002, 0x00000009, 0x00000000}},
+        {{0x00000007, 0}, Leaf{0x00000000, 0x00002282, 0x00000000, 0x00000000}},
+        {{0x00000008, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x00000009, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x0000000A, 0}, Leaf{0x07280203, 0x00000000, 0x00000000, 0x00004503}},
+        {{0x0000000B, 0}, Leaf{0x00000001, 0x00000001, 0x00000100, 0x00000000}},
+        {{0x0000000B, 1}, Leaf{0x00000004, 0x00000004, 0x00000201, 0x00000000}},
+        {{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000101, 0x28100000}},
+        {{0x80000002, 0}, Leaf{0x20202020, 0x6E492020, 0x286C6574, 0x43202952}},
+        {{0x80000003, 0}, Leaf{0x72656C65, 0x52286E6F, 0x50432029, 0x4A202055}},
+        {{0x80000004, 0}, Leaf{0x30303931, 0x20402020, 0x39392E31, 0x007A4847}},
+        {{0x80000005, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
+        {{0x80000006, 0}, Leaf{0x00000000, 0x00000000, 0x04008040, 0x00000000}},
+        {{0x80000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000100}},
+        {{0x80000008, 0}, Leaf{0x00003024, 0x00000000, 0x00000000, 0x00000000}},
+    });
+    const auto info = GetX86Info();
+
+    EXPECT_STREQ(info.vendor, "GenuineIntel");
+    EXPECT_EQ(info.family, 0x06);
+    EXPECT_EQ(info.model, 0x37);
+    EXPECT_EQ(info.stepping, 0x03);
+    EXPECT_EQ(GetX86Microarchitecture(&info),
+        X86Microarchitecture::INTEL_ATOM_SMT);
+
+    char brand_string[49];
+    FillX86BrandString(brand_string);
+    EXPECT_STREQ(brand_string, "      Intel(R) Celeron(R) CPU  J1900  @ 1.99GHz");
+
+    EXPECT_TRUE(info.features.sse);
+    EXPECT_TRUE(info.features.sse2);
+    EXPECT_TRUE(info.features.sse3);
+#ifndef CPU_FEATURES_OS_WINDOWS
+    // Currently disabled on Windows as IsProcessorFeaturePresent do not support
+    // feature detection > sse3.
+    EXPECT_TRUE(info.features.ssse3);
+    EXPECT_TRUE(info.features.sse4_1);
+    EXPECT_TRUE(info.features.sse4_2);
+#endif  // CPU_FEATURES_OS_WINDOWS
+}
+
+// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel0000673_P3_KatmaiDP_CPUID.txt
+TEST_F(CpuidX86Test, P3)
+{
+    // Pre AVX cpus don't have xsave
+    g_fake_cpu->SetOsBackupsExtendedRegisters(false);
+#if defined(CPU_FEATURES_OS_WINDOWS)
+    g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
+        PF_XMMI_INSTRUCTIONS_AVAILABLE);
+#endif  // CPU_FEATURES_OS_WINDOWS
+#if defined(CPU_FEATURES_OS_DARWIN)
+    g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
+#endif  // CPU_FEATURES_OS_DARWIN
+#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
+    auto& fs = GetEmptyFilesystem();
+    fs.CreateFile("/proc/cpuinfo", R"(
+flags           : fpu mmx sse
+)");
+#endif  // CPU_FEATURES_OS_LINUX_OR_ANDROID
+    g_fake_cpu->SetLeaves({
+        {{0x00000000, 0}, Leaf{0x00000003, 0x756E6547, 0x6C65746E, 0x49656E69}},
+        {{0x00000001, 0}, Leaf{0x00000673, 0x00000000, 0x00000000, 0x0387FBFF}},
+        {{0x00000002, 0}, Leaf{0x03020101, 0x00000000, 0x00000000, 0x0C040843}},
+        {{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x4CECC782, 0x00006778}},
+    });
+    const auto info = GetX86Info();
+
+    EXPECT_STREQ(info.vendor, "GenuineIntel");
+    EXPECT_EQ(info.family, 0x06);
+    EXPECT_EQ(info.model, 0x07);
+    EXPECT_EQ(info.stepping, 0x03);
+    EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::X86_UNKNOWN);
+
+    char brand_string[49];
+    FillX86BrandString(brand_string);
+    EXPECT_STREQ(brand_string, "");
+
+    EXPECT_TRUE(info.features.mmx);
+    EXPECT_TRUE(info.features.sse);
+    EXPECT_FALSE(info.features.sse2);
+    EXPECT_FALSE(info.features.sse3);
+#ifndef CPU_FEATURES_OS_WINDOWS
+    // Currently disabled on Windows as IsProcessorFeaturePresent do not support
+    // feature detection > sse3.
+    EXPECT_FALSE(info.features.ssse3);
+    EXPECT_FALSE(info.features.sse4_1);
+    EXPECT_FALSE(info.features.sse4_2);
+#endif  // CPU_FEATURES_OS_WINDOWS
+}
+
+// TODO(user): test what happens when xsave/osxsave are not present.
+// TODO(user): test what happens when xmm/ymm/zmm os support are not
+// present.
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/filesystem_for_testing.cc

@@ -0,0 +1,104 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "filesystem_for_testing.h"
+#include <cassert>
+#include <climits>
+#include <cstdio>
+#include <cstring>
+#include <utility>
+
+namespace cpu_features
+{
+FakeFile::FakeFile(int file_descriptor, const char* content)
+    : file_descriptor_(file_descriptor), content_(content) {}
+
+FakeFile::~FakeFile() { assert(!opened_); }
+
+void FakeFile::Open()
+{
+    assert(!opened_);
+    opened_ = true;
+}
+
+void FakeFile::Close()
+{
+    assert(opened_);
+    opened_ = false;
+}
+
+int FakeFile::Read(int fd, void* buf, size_t count)
+{
+    assert(count < INT_MAX);
+    assert(fd == file_descriptor_);
+    const size_t remainder = content_.size() - head_index_;
+    const size_t read = count > remainder ? remainder : count;
+    memcpy(buf, content_.data() + head_index_, read);
+    head_index_ += read;
+    assert(read < INT_MAX);
+    return (int)read;
+}
+
+void FakeFilesystem::Reset() { files_.clear(); }
+
+FakeFile* FakeFilesystem::CreateFile(const std::string& filename,
+    const char* content)
+{
+    auto& file = files_[filename];
+    file =
+        std::unique_ptr<FakeFile>(new FakeFile(next_file_descriptor_++, content));
+    return file.get();
+}
+
+FakeFile* FakeFilesystem::FindFileOrNull(const std::string& filename) const
+{
+    const auto itr = files_.find(filename);
+    return itr == files_.end() ? nullptr : itr->second.get();
+}
+
+FakeFile* FakeFilesystem::FindFileOrDie(const int file_descriptor) const
+{
+    for (const auto& filename_file_pair : files_)
+        {
+            FakeFile* const file_ptr = filename_file_pair.second.get();
+            if (file_ptr->GetFileDescriptor() == file_descriptor)
+                {
+                    return file_ptr;
+                }
+        }
+    assert(false);
+    return nullptr;
+}
+
+static FakeFilesystem* kFilesystem = new FakeFilesystem();
+
+FakeFilesystem& GetEmptyFilesystem()
+{
+    kFilesystem->Reset();
+    return *kFilesystem;
+}
+
+extern "C" int CpuFeatures_OpenFile(const char* filename)
+{
+    auto* const file = kFilesystem->FindFileOrNull(filename);
+    if (file)
+        {
+            file->Open();
+            return file->GetFileDescriptor();
+        }
+    return -1;
+}
+
+extern "C" void CpuFeatures_CloseFile(int file_descriptor)
+{
+    kFilesystem->FindFileOrDie(file_descriptor)->Close();
+}
+
+extern "C" int CpuFeatures_ReadFile(int file_descriptor, void* buffer,
+    size_t buffer_size)
+{
+    return kFilesystem->FindFileOrDie(file_descriptor)
+        ->Read(file_descriptor, buffer, buffer_size);
+}
+
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/filesystem_for_testing.h

@@ -0,0 +1,51 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+// Implements a fake filesystem, useful for tests.
+#ifndef CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
+#define CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_
+
+#include "internal/filesystem.h"
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+namespace cpu_features
+{
+class FakeFile
+{
+public:
+    explicit FakeFile(int file_descriptor, const char* content);
+    ~FakeFile();
+
+    void Open();
+    void Close();
+    int Read(int fd, void* buf, size_t count);
+
+    int GetFileDescriptor() const { return file_descriptor_; }
+
+private:
+    const int file_descriptor_;
+    const std::string content_;
+    bool opened_ = false;
+    size_t head_index_ = 0;
+};
+
+class FakeFilesystem
+{
+public:
+    void Reset();
+    FakeFile* CreateFile(const std::string& filename, const char* content);
+    FakeFile* FindFileOrDie(const int file_descriptor) const;
+    FakeFile* FindFileOrNull(const std::string& filename) const;
+
+private:
+    int next_file_descriptor_ = 0;
+    std::unordered_map<std::string, std::unique_ptr<FakeFile>> files_;
+};
+
+FakeFilesystem& GetEmptyFilesystem();
+
+}  // namespace cpu_features
+
+#endif  // CPU_FEATURES_TEST_FILESYSTEM_FOR_TESTING_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/hwcaps_for_testing.cc

@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "hwcaps_for_testing.h"
+#include "internal/string_view.h"
+#include <string.h>
+
+namespace cpu_features
+{
+namespace
+{
+static auto* const g_hardware_capabilities = new HardwareCapabilities();
+static auto* const g_platform_types = new PlatformType();
+}  // namespace
+
+void SetHardwareCapabilities(uint32_t hwcaps, uint32_t hwcaps2)
+{
+    g_hardware_capabilities->hwcaps = hwcaps;
+    g_hardware_capabilities->hwcaps2 = hwcaps2;
+}
+
+HardwareCapabilities CpuFeatures_GetHardwareCapabilities(void)
+{
+    return *g_hardware_capabilities;
+}
+
+void SetPlatformTypes(const char* platform, const char* base_platform)
+{
+    CpuFeatures_StringView_CopyString(str(platform), g_platform_types->platform,
+        sizeof(g_platform_types->platform));
+    CpuFeatures_StringView_CopyString(str(base_platform),
+        g_platform_types->base_platform,
+        sizeof(g_platform_types->base_platform));
+}
+
+PlatformType CpuFeatures_GetPlatformType(void) { return *g_platform_types; }
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/hwcaps_for_testing.h

@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
+#define CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_
+
+#include "internal/hwcaps.h"
+
+namespace cpu_features
+{
+void SetHardwareCapabilities(uint32_t hwcaps, uint32_t hwcaps2);
+void SetPlatformTypes(const char *platform, const char *base_platform);
+
+}  // namespace cpu_features
+
+#endif  // CPU_FEATURES_TEST_HWCAPS_FOR_TESTING_H_

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/stack_line_reader_test.cc

@@ -0,0 +1,125 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "filesystem_for_testing.h"
+#include "gtest/gtest.h"
+#include "internal/stack_line_reader.h"
+
+namespace cpu_features
+{
+bool operator==(const StringView& a, const StringView& b)
+{
+    return CpuFeatures_StringView_IsEquals(a, b);
+}
+
+namespace
+{
+std::string ToString(StringView view) { return {view.ptr, view.size}; }
+
+TEST(StackLineReaderTest, Empty)
+{
+    auto& fs = GetEmptyFilesystem();
+    auto* file = fs.CreateFile("/proc/cpuinfo", "");
+    StackLineReader reader;
+    StackLineReader_Initialize(&reader, file->GetFileDescriptor());
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_TRUE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str(""));
+    }
+}
+
+TEST(StackLineReaderTest, ManySmallLines)
+{
+    auto& fs = GetEmptyFilesystem();
+    auto* file = fs.CreateFile("/proc/cpuinfo", "a\nb\nc");
+
+    StackLineReader reader;
+    StackLineReader_Initialize(&reader, file->GetFileDescriptor());
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("a"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("b"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_TRUE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("c"));
+    }
+}
+
+TEST(StackLineReaderTest, TruncatedLine)
+{
+    auto& fs = GetEmptyFilesystem();
+    auto* file = fs.CreateFile("/proc/cpuinfo", R"(First
+Second
+More than 16 characters, this will be truncated.
+last)");
+
+    StackLineReader reader;
+    StackLineReader_Initialize(&reader, file->GetFileDescriptor());
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("First"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("Second"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_FALSE(result.full_line);
+        EXPECT_EQ(result.line, str("More than 16 cha"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_TRUE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str("last"));
+    }
+}
+
+TEST(StackLineReaderTest, TruncatedLines)
+{
+    auto& fs = GetEmptyFilesystem();
+    auto* file = fs.CreateFile("/proc/cpuinfo", R"(More than 16 characters
+Another line that is too long)");
+
+    StackLineReader reader;
+    StackLineReader_Initialize(&reader, file->GetFileDescriptor());
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_FALSE(result.full_line);
+        EXPECT_EQ(result.line, str("More than 16 cha"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_FALSE(result.eof);
+        EXPECT_FALSE(result.full_line);
+        EXPECT_EQ(result.line, str("Another line tha"));
+    }
+    {
+        const auto result = StackLineReader_NextLine(&reader);
+        EXPECT_TRUE(result.eof);
+        EXPECT_TRUE(result.full_line);
+        EXPECT_EQ(result.line, str(""));
+    }
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/cpu_features/test/string_view_test.cc

@@ -0,0 +1,198 @@
+// SPDX-FileCopyrightText: 2017 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+
+#include "gtest/gtest.h"
+#include "internal/string_view.h"
+
+namespace cpu_features
+{
+bool operator==(const StringView& a, const StringView& b)
+{
+    return CpuFeatures_StringView_IsEquals(a, b);
+}
+
+namespace
+{
+TEST(StringViewTest, Empty)
+{
+    EXPECT_EQ(kEmptyStringView.ptr, nullptr);
+    EXPECT_EQ(kEmptyStringView.size, 0);
+}
+
+TEST(StringViewTest, Build)
+{
+    const auto view = str("test");
+    EXPECT_EQ(view.ptr[0], 't');
+    EXPECT_EQ(view.size, 4);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IndexOfChar)
+{
+    // Found.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("test"), 'e'), 1);
+    EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("test"), 't'), 0);
+    EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("beef"), 'e'), 1);
+    // Not found.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("test"), 'z'), -1);
+    // Empty.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(kEmptyStringView, 'z'), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IndexOf)
+{
+    // Found.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("test"), str("es")), 1);
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("test"), str("test")), 0);
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("tesstest"), str("test")), 4);
+    // Not found.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("test"), str("aa")), -1);
+    // Empty.
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(kEmptyStringView, str("aa")), -1);
+    EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("aa"), kEmptyStringView), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_StartsWith)
+{
+    EXPECT_TRUE(CpuFeatures_StringView_StartsWith(str("test"), str("te")));
+    EXPECT_TRUE(CpuFeatures_StringView_StartsWith(str("test"), str("test")));
+    EXPECT_FALSE(CpuFeatures_StringView_StartsWith(str("test"), str("st")));
+    EXPECT_FALSE(CpuFeatures_StringView_StartsWith(str("test"), str("est")));
+    EXPECT_FALSE(CpuFeatures_StringView_StartsWith(str("test"), str("")));
+    EXPECT_FALSE(
+        CpuFeatures_StringView_StartsWith(str("test"), kEmptyStringView));
+    EXPECT_FALSE(
+        CpuFeatures_StringView_StartsWith(kEmptyStringView, str("test")));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IsEquals)
+{
+    EXPECT_TRUE(
+        CpuFeatures_StringView_IsEquals(kEmptyStringView, kEmptyStringView));
+    EXPECT_TRUE(CpuFeatures_StringView_IsEquals(kEmptyStringView, str("")));
+    EXPECT_TRUE(CpuFeatures_StringView_IsEquals(str(""), kEmptyStringView));
+    EXPECT_TRUE(CpuFeatures_StringView_IsEquals(str("test"), str("test")));
+    EXPECT_TRUE(CpuFeatures_StringView_IsEquals(str("a"), str("a")));
+    EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("a"), str("b")));
+    EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("aa"), str("a")));
+    EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("a"), str("aa")));
+    EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("a"), kEmptyStringView));
+    EXPECT_FALSE(CpuFeatures_StringView_IsEquals(kEmptyStringView, str("a")));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_PopFront)
+{
+    EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 2), str("st"));
+    EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 0), str("test"));
+    EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 4), str(""));
+    EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 100), str(""));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_PopBack)
+{
+    EXPECT_EQ(CpuFeatures_StringView_PopBack(str("test"), 2), str("te"));
+    EXPECT_EQ(CpuFeatures_StringView_PopBack(str("test"), 0), str("test"));
+    EXPECT_EQ(CpuFeatures_StringView_PopBack(str("test"), 4), str(""));
+    EXPECT_EQ(CpuFeatures_StringView_PopBack(str("test"), 100), str(""));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_KeepFront)
+{
+    EXPECT_EQ(CpuFeatures_StringView_KeepFront(str("test"), 2), str("te"));
+    EXPECT_EQ(CpuFeatures_StringView_KeepFront(str("test"), 0), str(""));
+    EXPECT_EQ(CpuFeatures_StringView_KeepFront(str("test"), 4), str("test"));
+    EXPECT_EQ(CpuFeatures_StringView_KeepFront(str("test"), 6), str("test"));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_Front)
+{
+    EXPECT_EQ(CpuFeatures_StringView_Front(str("apple")), 'a');
+    EXPECT_EQ(CpuFeatures_StringView_Front(str("a")), 'a');
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_Back)
+{
+    EXPECT_EQ(CpuFeatures_StringView_Back(str("apple")), 'e');
+    EXPECT_EQ(CpuFeatures_StringView_Back(str("a")), 'a');
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_TrimWhitespace)
+{
+    EXPECT_EQ(CpuFeatures_StringView_TrimWhitespace(str("  first middle last  ")),
+        str("first middle last"));
+    EXPECT_EQ(CpuFeatures_StringView_TrimWhitespace(str("first middle last  ")),
+        str("first middle last"));
+    EXPECT_EQ(CpuFeatures_StringView_TrimWhitespace(str("  first middle last")),
+        str("first middle last"));
+    EXPECT_EQ(CpuFeatures_StringView_TrimWhitespace(str("first middle last")),
+        str("first middle last"));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_ParsePositiveNumber)
+{
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("42")), 42);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2a")), 42);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2A")), 42);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2A2a")), 10794);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2a2A")), 10794);
+
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("-10")), -1);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("-0x2A")), -1);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("abc")), -1);
+    EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("")), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_CopyString)
+{
+    char buf[4];
+    buf[0] = 'X';
+
+    // Empty
+    CpuFeatures_StringView_CopyString(str(""), buf, sizeof(buf));
+    EXPECT_STREQ(buf, "");
+
+    // Less
+    CpuFeatures_StringView_CopyString(str("a"), buf, sizeof(buf));
+    EXPECT_STREQ(buf, "a");
+
+    // exact
+    CpuFeatures_StringView_CopyString(str("abc"), buf, sizeof(buf));
+    EXPECT_STREQ(buf, "abc");
+
+    // More
+    CpuFeatures_StringView_CopyString(str("abcd"), buf, sizeof(buf));
+    EXPECT_STREQ(buf, "abc");
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_HasWord)
+{
+    // Find flags at beginning, middle and end.
+    EXPECT_TRUE(
+        CpuFeatures_StringView_HasWord(str("first middle last"), "first"));
+    EXPECT_TRUE(
+        CpuFeatures_StringView_HasWord(str("first middle last"), "middle"));
+    EXPECT_TRUE(CpuFeatures_StringView_HasWord(str("first middle last"), "last"));
+    // Do not match partial flags
+    EXPECT_FALSE(
+        CpuFeatures_StringView_HasWord(str("first middle last"), "irst"));
+    EXPECT_FALSE(CpuFeatures_StringView_HasWord(str("first middle last"), "mid"));
+    EXPECT_FALSE(CpuFeatures_StringView_HasWord(str("first middle last"), "las"));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_GetAttributeKeyValue)
+{
+    const StringView line = str(" key :   first middle last   ");
+    StringView key, value;
+    EXPECT_TRUE(CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value));
+    EXPECT_EQ(key, str("key"));
+    EXPECT_EQ(value, str("first middle last"));
+}
+
+TEST(StringViewTest, FailingGetAttributeKeyValue)
+{
+    const StringView line = str("key  first middle last");
+    StringView key, value;
+    EXPECT_FALSE(CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value));
+}
+
+}  // namespace
+}  // namespace cpu_features

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/gen/archs.xml

@@ -20,7 +20,7 @@
   <flag compiler="gnu">-funsafe-math-optimizations</flag>
   <flag compiler="clang">-funsafe-math-optimizations</flag>
   <alignment>16</alignment>
-  <check name="has_neon"></check>
+  <check name="neon"></check>
 </arch>
 
 <arch name="neonv7">
@@ -29,14 +29,14 @@
   <flag compiler="clang">-mfpu=neon</flag>
   <flag compiler="clang">-funsafe-math-optimizations</flag>
   <alignment>16</alignment>
-  <check name="has_neonv7"></check>
+  <check name="neon"></check>
 </arch>
 
 <arch name="neonv8">
   <flag compiler="gnu">-funsafe-math-optimizations</flag>
   <flag compiler="clang">-funsafe-math-optimizations</flag>
   <alignment>16</alignment>
-  <check name="has_neonv8"></check>
+  <check name="neon"></check>
 </arch>
 
 <arch name="32">
@@ -45,57 +45,27 @@
 </arch>
 
 <arch name="64">
-  <check name="check_extended_cpuid">
-      <param>0x80000001</param>
-  </check>
-  <check name="cpuid_x86_bit">  <!-- checks to see if a bit is set -->
-      <param>3</param>          <!-- eax, ebx, ecx, [edx] -->
-      <param>0x80000001</param> <!-- cpuid operation -->
-      <param>29</param>         <!-- bit shift -->
-  </check>
+  <!-- <check name="check_extended_cpuid"> -->
+      <!-- <param>0x80000001</param>
+  </check> -->
+  <!--<check name="cpuid_x86_bit">   checks to see if a bit is set -->
+  <!--    <param>3</param>           eax, ebx, ecx, [edx] -->
+  <!--    <param>0x80000001</param>  cpuid operation -->
+  <!--    <param>29</param>          bit shift -->
+  <!-- </check> -->
   <flag compiler="gnu">-m64</flag>
   <flag compiler="clang">-m64</flag>
 </arch>
 
-<arch name="3dnow">
-  <check name="cpuid_x86_bit">
-      <param>3</param>
-      <param>0x80000001</param>
-      <param>31</param>
-  </check>
-  <flag compiler="gnu">-m3dnow</flag>
-  <flag compiler="clang">-m3dnow</flag>
-  <alignment>8</alignment>
-</arch>
-
-<arch name="abm">
-  <check name="cpuid_x86_bit">
-      <param>3</param>
-      <param>0x80000001</param>
-      <param>5</param>
-  </check>
-  <flag compiler="gnu">-msse4.2</flag>
-  <flag compiler="clang">-msse4.2</flag>
-  <alignment>16</alignment>
-</arch>
-
 <arch name="popcount">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>23</param>
-  </check>
+  <check name="popcnt"></check>
   <flag compiler="gnu">-mpopcnt</flag>
   <flag compiler="clang">-mpopcnt</flag>
   <flag compiler="msvc">/arch:AVX</flag>
 </arch>
 
 <arch name="mmx">
-  <check name="cpuid_x86_bit">
-      <param>3</param>
-      <param>0x00000001</param>
-      <param>23</param>
-  </check>
+  <check name="mmx"></check>
   <flag compiler="gnu">-mmmx</flag>
   <flag compiler="clang">-mmmx</flag>
   <flag compiler="msvc">/arch:SSE</flag>
@@ -103,11 +73,7 @@
 </arch>
 
 <arch name="fma">
-    <check name="cpuid_x86_bit">
-        <param>2</param>
-        <param>0x00000001</param>
-        <param>12</param>
-    </check>
+    <check name="fma3"></check>
     <flag compiler="gnu">-mfma</flag>
     <flag compiler="clang">-mfma</flag>
     <flag compiler="msvc">/arch:AVX2</flag>
@@ -115,11 +81,7 @@
 </arch>
 
 <arch name="sse">
-  <check name="cpuid_x86_bit">
-      <param>3</param>
-      <param>0x00000001</param>
-      <param>25</param>
-  </check>
+  <check name="sse"></check>
   <flag compiler="gnu">-msse</flag>
   <flag compiler="clang">-msse</flag>
   <flag compiler="msvc">/arch:SSE</flag>
@@ -129,11 +91,7 @@
 </arch>
 
 <arch name="sse2">
-  <check name="cpuid_x86_bit">
-      <param>3</param>
-      <param>0x00000001</param>
-      <param>26</param>
-  </check>
+  <check name="sse2"></check>
   <flag compiler="gnu">-msse2</flag>
   <flag compiler="clang">-msse2</flag>
   <flag compiler="msvc">/arch:SSE2</flag>
@@ -148,11 +106,7 @@
 </arch>
 
 <arch name="sse3">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>0</param>
-  </check>
+  <check name="sse3"></check>
   <flag compiler="gnu">-msse3</flag>
   <flag compiler="clang">-msse3</flag>
   <flag compiler="msvc">/arch:AVX</flag>
@@ -162,11 +116,7 @@
 </arch>
 
 <arch name="ssse3">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>9</param>
-  </check>
+  <check name="ssse3"></check>
   <flag compiler="gnu">-mssse3</flag>
   <flag compiler="clang">-mssse3</flag>
   <flag compiler="msvc">/arch:AVX</flag>
@@ -174,22 +124,14 @@
 </arch>
 
 <arch name="sse4_a">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x80000001</param>
-      <param>6</param>
-  </check>
+  <check name="sse4a"></check>
   <flag compiler="gnu">-msse4a</flag>
   <flag compiler="clang">-msse4a</flag>
   <alignment>16</alignment>
 </arch>
 
 <arch name="sse4_1">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>19</param>
-  </check>
+  <check name="sse4_1"></check>
   <flag compiler="gnu">-msse4.1</flag>
   <flag compiler="clang">-msse4.1</flag>
   <flag compiler="msvc">/arch:AVX</flag>
@@ -197,11 +139,7 @@
 </arch>
 
 <arch name="sse4_2">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>20</param>
-  </check>
+  <check name="sse4_2"></check>
   <flag compiler="gnu">-msse4.2</flag>
   <flag compiler="clang">-msse4.2</flag>
   <flag compiler="msvc">/arch:AVX</flag>
@@ -209,19 +147,7 @@
 </arch>
 
 <arch name="avx">
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>28</param>
-  </check>
-  <!-- check to make sure that xgetbv is enabled in OS -->
-  <check name="cpuid_x86_bit">
-      <param>2</param>
-      <param>0x00000001</param>
-      <param>27</param>
-  </check>
-  <!-- check to see that the OS has enabled AVX -->
-  <check name="get_avx_enabled"></check>
+  <check name="avx"></check>
   <flag compiler="gnu">-mavx</flag>
   <flag compiler="clang">-mavx</flag>
   <flag compiler="msvc">/arch:AVX</flag>
@@ -229,20 +155,7 @@
 </arch>
 
 <arch name="avx2">
-    <check name="cpuid_count_x86_bit">
-        <param>7</param>
-        <param>0</param>
-        <param>1</param>
-        <param>5</param>
-    </check>
-    <!-- check to make sure that xgetbv is enabled in OS -->
-    <check name="cpuid_x86_bit">
-        <param>2</param>
-        <param>0x00000001</param>
-        <param>27</param>
-    </check>
-    <!-- check to see that the OS has enabled AVX2 -->
-    <check name="get_avx2_enabled"></check>
+    <check name="avx2"></check>
     <flag compiler="gnu">-mavx2</flag>
     <flag compiler="clang">-mavx2</flag>
     <flag compiler="msvc">/arch:AVX2</flag>
@@ -250,21 +163,7 @@
 </arch>
 
 <arch name="avx512f">
-    <!-- check for AVX512F -->
-    <check name="cpuid_count_x86_bit">
-        <param>7</param>
-        <param>0</param>
-        <param>1</param>
-        <param>16</param>
-    </check>
-    <!-- check to make sure that xgetbv is enabled in OS -->
-    <check name="cpuid_x86_bit">
-        <param>2</param>
-        <param>0x00000001</param>
-        <param>27</param>
-    </check>
-    <!-- check to see that the OS has enabled AVX512 -->
-    <check name="get_avx512_enabled"></check>
+    <check name="avx512f"></check>
     <flag compiler="gnu">-mavx512f</flag>
     <flag compiler="clang">-mavx512f</flag>
     <flag compiler="msvc">/arch:AVX512F</flag>
@@ -272,21 +171,7 @@
 </arch>
 
 <arch name="avx512cd">
-    <!-- check for AVX512CD -->
-    <check name="cpuid_count_x86_bit">
-        <param>7</param>
-        <param>0</param>
-        <param>1</param>
-        <param>28</param>
-    </check>
-    <!-- check to make sure that xgetbv is enabled in OS -->
-    <check name="cpuid_x86_bit">
-        <param>2</param>
-        <param>0x00000001</param>
-        <param>27</param>
-    </check>
-    <!-- check to see that the OS has enabled AVX512 -->
-    <check name="get_avx512_enabled"></check>
+    <check name="avx512cd"></check>
     <flag compiler="gnu">-mavx512cd</flag>
     <flag compiler="clang">-mavx512cd</flag>
     <flag compiler="msvc">/arch:AVX512CD</flag>

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/gen/archs_old.xml

@@ -0,0 +1,296 @@
+<!-- archs appear in order of significance for blind, de-facto version ordering -->
+<!-- SPDX-License-Identifier: GPL-3.0-or-later -->
+<!-- SPDX-FileCopyrightText: 2014-2020 Carles Fernandez-Prades <carles.fernandez@cttc.es> -->
+<grammar>
+
+<arch name="generic"> <!-- name is required-->
+</arch>
+
+<arch name="softfp">
+  <flag compiler="gnu">-mfloat-abi=softfp</flag>
+  <flag compiler="clang">-mfloat-abi=softfp</flag>
+</arch>
+
+<arch name="hardfp">
+  <flag compiler="gnu">-mfloat-abi=hard</flag>
+  <flag compiler="clang">-mfloat-abi=hard</flag>
+</arch>
+
+<arch name="neon">
+  <flag compiler="gnu">-funsafe-math-optimizations</flag>
+  <flag compiler="clang">-funsafe-math-optimizations</flag>
+  <alignment>16</alignment>
+  <check name="has_neon"></check>
+</arch>
+
+<arch name="neonv7">
+  <flag compiler="gnu">-mfpu=neon</flag>
+  <flag compiler="gnu">-funsafe-math-optimizations</flag>
+  <flag compiler="clang">-mfpu=neon</flag>
+  <flag compiler="clang">-funsafe-math-optimizations</flag>
+  <alignment>16</alignment>
+  <check name="has_neonv7"></check>
+</arch>
+
+<arch name="neonv8">
+  <flag compiler="gnu">-funsafe-math-optimizations</flag>
+  <flag compiler="clang">-funsafe-math-optimizations</flag>
+  <alignment>16</alignment>
+  <check name="has_neonv8"></check>
+</arch>
+
+<arch name="32">
+  <flag compiler="gnu">-m32</flag>
+  <flag compiler="clang">-m32</flag>
+</arch>
+
+<arch name="64">
+  <check name="check_extended_cpuid">
+      <param>0x80000001</param>
+  </check>
+  <check name="cpuid_x86_bit">  <!-- checks to see if a bit is set -->
+      <param>3</param>          <!-- eax, ebx, ecx, [edx] -->
+      <param>0x80000001</param> <!-- cpuid operation -->
+      <param>29</param>         <!-- bit shift -->
+  </check>
+  <flag compiler="gnu">-m64</flag>
+  <flag compiler="clang">-m64</flag>
+</arch>
+
+<arch name="3dnow">
+  <check name="cpuid_x86_bit">
+      <param>3</param>
+      <param>0x80000001</param>
+      <param>31</param>
+  </check>
+  <flag compiler="gnu">-m3dnow</flag>
+  <flag compiler="clang">-m3dnow</flag>
+  <alignment>8</alignment>
+</arch>
+
+<arch name="abm">
+  <check name="cpuid_x86_bit">
+      <param>3</param>
+      <param>0x80000001</param>
+      <param>5</param>
+  </check>
+  <flag compiler="gnu">-msse4.2</flag>
+  <flag compiler="clang">-msse4.2</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="popcount">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>23</param>
+  </check>
+  <flag compiler="gnu">-mpopcnt</flag>
+  <flag compiler="clang">-mpopcnt</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+</arch>
+
+<arch name="mmx">
+  <check name="cpuid_x86_bit">
+      <param>3</param>
+      <param>0x00000001</param>
+      <param>23</param>
+  </check>
+  <flag compiler="gnu">-mmmx</flag>
+  <flag compiler="clang">-mmmx</flag>
+  <flag compiler="msvc">/arch:SSE</flag>
+  <alignment>8</alignment>
+</arch>
+
+<arch name="fma">
+    <check name="cpuid_x86_bit">
+        <param>2</param>
+        <param>0x00000001</param>
+        <param>12</param>
+    </check>
+    <flag compiler="gnu">-mfma</flag>
+    <flag compiler="clang">-mfma</flag>
+    <flag compiler="msvc">/arch:AVX2</flag>
+    <alignment>32</alignment>
+</arch>
+
+<arch name="sse">
+  <check name="cpuid_x86_bit">
+      <param>3</param>
+      <param>0x00000001</param>
+      <param>25</param>
+  </check>
+  <flag compiler="gnu">-msse</flag>
+  <flag compiler="clang">-msse</flag>
+  <flag compiler="msvc">/arch:SSE</flag>
+  <environment>_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);</environment>
+  <include>xmmintrin.h</include>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="sse2">
+  <check name="cpuid_x86_bit">
+      <param>3</param>
+      <param>0x00000001</param>
+      <param>26</param>
+  </check>
+  <flag compiler="gnu">-msse2</flag>
+  <flag compiler="clang">-msse2</flag>
+  <flag compiler="msvc">/arch:SSE2</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="orc">
+</arch>
+
+<!-- it's here for overrule stuff. -->
+<arch name="norc">
+</arch>
+
+<arch name="sse3">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>0</param>
+  </check>
+  <flag compiler="gnu">-msse3</flag>
+  <flag compiler="clang">-msse3</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+  <environment>_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);</environment>
+  <include>pmmintrin.h</include>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="ssse3">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>9</param>
+  </check>
+  <flag compiler="gnu">-mssse3</flag>
+  <flag compiler="clang">-mssse3</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="sse4_a">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x80000001</param>
+      <param>6</param>
+  </check>
+  <flag compiler="gnu">-msse4a</flag>
+  <flag compiler="clang">-msse4a</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="sse4_1">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>19</param>
+  </check>
+  <flag compiler="gnu">-msse4.1</flag>
+  <flag compiler="clang">-msse4.1</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="sse4_2">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>20</param>
+  </check>
+  <flag compiler="gnu">-msse4.2</flag>
+  <flag compiler="clang">-msse4.2</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+  <alignment>16</alignment>
+</arch>
+
+<arch name="avx">
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>28</param>
+  </check>
+  <!-- check to make sure that xgetbv is enabled in OS -->
+  <check name="cpuid_x86_bit">
+      <param>2</param>
+      <param>0x00000001</param>
+      <param>27</param>
+  </check>
+  <!-- check to see that the OS has enabled AVX -->
+  <check name="get_avx_enabled"></check>
+  <flag compiler="gnu">-mavx</flag>
+  <flag compiler="clang">-mavx</flag>
+  <flag compiler="msvc">/arch:AVX</flag>
+  <alignment>32</alignment>
+</arch>
+
+<arch name="avx2">
+    <check name="cpuid_count_x86_bit">
+        <param>7</param>
+        <param>0</param>
+        <param>1</param>
+        <param>5</param>
+    </check>
+    <!-- check to make sure that xgetbv is enabled in OS -->
+    <check name="cpuid_x86_bit">
+        <param>2</param>
+        <param>0x00000001</param>
+        <param>27</param>
+    </check>
+    <!-- check to see that the OS has enabled AVX2 -->
+    <check name="get_avx2_enabled"></check>
+    <flag compiler="gnu">-mavx2</flag>
+    <flag compiler="clang">-mavx2</flag>
+    <flag compiler="msvc">/arch:AVX2</flag>
+    <alignment>32</alignment>
+</arch>
+
+<arch name="avx512f">
+    <!-- check for AVX512F -->
+    <check name="cpuid_count_x86_bit">
+        <param>7</param>
+        <param>0</param>
+        <param>1</param>
+        <param>16</param>
+    </check>
+    <!-- check to make sure that xgetbv is enabled in OS -->
+    <check name="cpuid_x86_bit">
+        <param>2</param>
+        <param>0x00000001</param>
+        <param>27</param>
+    </check>
+    <!-- check to see that the OS has enabled AVX512 -->
+    <check name="get_avx512_enabled"></check>
+    <flag compiler="gnu">-mavx512f</flag>
+    <flag compiler="clang">-mavx512f</flag>
+    <flag compiler="msvc">/arch:AVX512F</flag>
+    <alignment>64</alignment>
+</arch>
+
+<arch name="avx512cd">
+    <!-- check for AVX512CD -->
+    <check name="cpuid_count_x86_bit">
+        <param>7</param>
+        <param>0</param>
+        <param>1</param>
+        <param>28</param>
+    </check>
+    <!-- check to make sure that xgetbv is enabled in OS -->
+    <check name="cpuid_x86_bit">
+        <param>2</param>
+        <param>0x00000001</param>
+        <param>27</param>
+    </check>
+    <!-- check to see that the OS has enabled AVX512 -->
+    <check name="get_avx512_enabled"></check>
+    <flag compiler="gnu">-mavx512cd</flag>
+    <flag compiler="clang">-mavx512cd</flag>
+    <flag compiler="msvc">/arch:AVX512CD</flag>
+    <alignment>64</alignment>
+</arch>
+
+</grammar>

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/gen/volk_gnsssdr_arch_defs.py.in

@@ -53,7 +53,7 @@ def register_arch(**kwargs):
 from xml.dom import minidom
 import os
 gendir = os.path.dirname(__file__)
-archs_xml = minidom.parse(os.path.join(gendir, 'archs.xml')).getElementsByTagName('arch')
+archs_xml = minidom.parse(os.path.join(gendir, '@VOLK_GNSSSSDR_ARCHS_XML_FILE@')).getElementsByTagName('arch')
 for arch_xml in archs_xml:
     kwargs = dict()
     for attr in arch_xml.attributes.keys():

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/lib/CMakeLists.txt

@@ -42,6 +42,13 @@ if(MSVC) # its not set otherwise
     set(COMPILER_NAME MSVC)
 endif()
 
+# Assume "AppleClang == Clang".
+string(TOLOWER ${COMPILER_NAME} COMPILER_NAME_LOWER)
+string(REGEX MATCH "clang" COMPILER_NAME_LOWER ${COMPILER_NAME_LOWER})
+if(${COMPILER_NAME_LOWER} MATCHES "clang")
+    set(COMPILER_NAME "Clang")
+endif()
+
 message(STATUS "Compiler name: ${COMPILER_NAME}")
 
 if(NOT DEFINED COMPILER_NAME)
@@ -82,6 +89,16 @@ endif()
 if(NOT PYTHON_DASH_B)
     set(PYTHON_DASH_B "")
 endif()
+if(USE_CPU_FEATURES)
+    set(VOLK_GNSSSSDR_ARCHS_XML_FILE "archs.xml")
+else()
+    set(VOLK_GNSSSSDR_ARCHS_XML_FILE "archs_old.xml")
+endif()
+configure_file(${PROJECT_SOURCE_DIR}/gen/volk_gnsssdr_arch_defs.py.in
+    ${PROJECT_SOURCE_DIR}/gen/volk_gnsssdr_arch_defs.py
+    @ONLY
+)
+
 execute_process(
     COMMAND ${PYTHON_EXECUTABLE} ${PYTHON_DASH_B}
     ${PROJECT_SOURCE_DIR}/gen/volk_gnsssdr_compile_utils.py
@@ -133,33 +150,8 @@ endmacro()
 # the xgetbv instruction, or {if not cross-compiling and the xgetbv
 # executable does not function correctly}.
 ########################################################################
-set(HAVE_XGETBV 0)
 set(HAVE_AVX_CVTPI32_PS 0)
 if(CPU_IS_x86)
-    # check to see if the compiler/linker works with xgetb instruction
-    if(NOT MSVC)
-        file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv.c "#include <volk_gnsssdr/volk_gnsssdr_common.h>\n unsigned long long _xgetbv(unsigned int index) { unsigned int eax, edx; __VOLK_ASM __VOLK_VOLATILE(\"xgetbv\" : \"=a\"(eax), \"=d\"(edx) : \"c\"(index)); return ((unsigned long long)edx << 32) | eax; } int main (void) { (void) _xgetbv(0); return (0); }")
-        set(_AUX_INCLUDE_FLAG -I${PROJECT_SOURCE_DIR}/include)
-    else()
-        # MSVC defines an intrinsic
-        file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv.c "#include <stdio.h> \n #include <intrin.h> \n int main() { int avxSupported = 0; \n#if (_MSC_FULL_VER >= 160040219) \nint cpuInfo[4]; __cpuid(cpuInfo, 1);\nif ((cpuInfo[2] & (1 << 27) || 0) && (cpuInfo[2] & (1 << 28) || 0)) \n{\nunsigned long long xcrFeatureMask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);\n   avxSupported = (xcrFeatureMask & 0x6) == 6;}\n#endif \n return 1- avxSupported; }")
-    endif()
-    execute_process(COMMAND ${CMAKE_C_COMPILER} ${_AUX_INCLUDE_FLAG} -o
-        ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv
-        ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv.c
-        OUTPUT_QUIET ERROR_QUIET
-        RESULT_VARIABLE avx_compile_result
-    )
-    if(NOT ${avx_compile_result} EQUAL 0)
-        overrule_arch(avx "Compiler or linker missing xgetbv instruction")
-    else()
-        # compiler/linker seems to work; assume working
-        set(HAVE_XGETBV 1)
-    endif()
-    file(REMOVE ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv
-        ${CMAKE_CURRENT_BINARY_DIR}/test_xgetbv.c
-    )
-
     #########################################################################
     # eliminate AVX if cvtpi32_ps intrinsic fails like some versions of clang
     #########################################################################
@@ -205,10 +197,6 @@ if(CPU_IS_x86)
     endif()
 endif()
 
-if(${HAVE_XGETBV})
-    add_definitions(-DHAVE_XGETBV)
-endif()
-
 if(${HAVE_AVX_CVTPI32_PS})
     add_definitions(-DHAVE_AVX_CVTPI32_PS)
 endif()
@@ -338,6 +326,11 @@ message(STATUS "Available machines: ${available_machines}")
 
 # dependencies are all python, xml, and header implementation files
 file(GLOB xml_files ${PROJECT_SOURCE_DIR}/gen/*.xml)
+if(USE_CPU_FEATURES)
+    list(REMOVE_ITEM xml_files ${PROJECT_SOURCE_DIR}/gen/archs_old.xml)
+else()
+    list(REMOVE_ITEM xml_files ${PROJECT_SOURCE_DIR}/gen/archs.xml)
+endif()
 list(SORT xml_files)
 file(GLOB py_files ${PROJECT_SOURCE_DIR}/gen/*.py)
 list(SORT py_files)
@@ -361,7 +354,11 @@ gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr.tmpl.h              ${PROJE
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr.tmpl.c              ${PROJECT_BINARY_DIR}/lib/volk_gnsssdr.c)
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_typedefs.tmpl.h     ${PROJECT_BINARY_DIR}/include/volk_gnsssdr/volk_gnsssdr_typedefs.h)
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_cpu.tmpl.h          ${PROJECT_BINARY_DIR}/include/volk_gnsssdr/volk_gnsssdr_cpu.h)
+if(USE_CPU_FEATURES)
     gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_cpu.tmpl.c      ${PROJECT_BINARY_DIR}/lib/volk_gnsssdr_cpu.c)
+else()
+    gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_cpu.tmpl.old.c  ${PROJECT_BINARY_DIR}/lib/volk_gnsssdr_cpu.c)
+endif()
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_config_fixed.tmpl.h ${PROJECT_BINARY_DIR}/include/volk_gnsssdr/volk_gnsssdr_config_fixed.h)
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_machines.tmpl.h     ${PROJECT_BINARY_DIR}/lib/volk_gnsssdr_machines.h)
 gen_template(${PROJECT_SOURCE_DIR}/tmpl/volk_gnsssdr_machines.tmpl.c     ${PROJECT_BINARY_DIR}/lib/volk_gnsssdr_machines.c)
@@ -553,6 +550,12 @@ if(NOT (CMAKE_GENERATOR STREQUAL Xcode))
         PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
         PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
     )
+    if(USE_CPU_FEATURES)
+        target_include_directories(volk_gnsssdr_obj
+            PRIVATE
+                $<TARGET_PROPERTY:cpu_features,INTERFACE_INCLUDE_DIRECTORIES>
+        )
+    endif()
     # Configure object target properties
     if(NOT MSVC)
         set_target_properties(volk_gnsssdr_obj PROPERTIES COMPILE_FLAGS "-fPIC")
@@ -565,7 +568,14 @@ if(CMAKE_GENERATOR STREQUAL Xcode)
 else()
     add_library(volk_gnsssdr SHARED $<TARGET_OBJECTS:volk_gnsssdr_obj>)
 endif()
+if(USE_CPU_FEATURES)
+    target_link_libraries(volk_gnsssdr
+        PUBLIC ${volk_gnsssdr_libraries}
+        PRIVATE cpu_features
+    )
+else()
     target_link_libraries(volk_gnsssdr PUBLIC ${volk_gnsssdr_libraries})
+endif()
 target_include_directories(volk_gnsssdr
     PUBLIC $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
     PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
@@ -574,7 +584,12 @@ target_include_directories(volk_gnsssdr
     PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
     PUBLIC $<INSTALL_INTERFACE:include>
 )
-
+if(USE_CPU_FEATURES)
+    target_include_directories(volk_gnsssdr
+        PRIVATE
+            $<TARGET_PROPERTY:cpu_features,INTERFACE_INCLUDE_DIRECTORIES>
+    )
+endif()
 # Configure target properties
 if(NOT MSVC)
     target_link_libraries(volk_gnsssdr PUBLIC m)
@@ -597,6 +612,11 @@ if(ENABLE_STATIC_LIBS)
     else()
         add_library(volk_gnsssdr_static STATIC $<TARGET_OBJECTS:volk_gnsssdr_obj>)
     endif()
+    if(USE_CPU_FEATURES)
+        target_link_libraries(volk_gnsssdr_static
+            PRIVATE cpu_features
+        )
+    endif()
     target_link_libraries(volk_gnsssdr_static PUBLIC ${volk_gnsssdr_libraries} pthread)
     if(NOT MSVC)
         target_link_libraries(volk_gnsssdr_static PUBLIC m)

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/tmpl/volk_gnsssdr_cpu.tmpl.c

@@ -14,204 +14,40 @@
 #include <string.h>
 // clang-format on
 
+#include "cpu_features_macros.h"
+#if defined(CPU_FEATURES_ARCH_X86)
+#include "cpuinfo_x86.h"
+#elif defined(CPU_FEATURES_ARCH_ARM)
+#include "cpuinfo_arm.h"
+#elif defined(CPU_FEATURES_ARCH_AARCH64)
+#include "cpuinfo_aarch64.h"
+#elif defined(CPU_FEATURES_ARCH_MIPS)
+#include "cpuinfo_mips.h"
+#elif defined(CPU_FEATURES_ARCH_PPC)
+#include "cpuinfo_ppc.h"
+#endif
+
+// This is required for MSVC
+#if defined(__cplusplus)
+using namespace cpu_features;
+#endif
+
 struct VOLK_CPU volk_gnsssdr_cpu;
 
-#if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
-#define VOLK_CPU_x86
-#endif
-
-#if defined(VOLK_CPU_x86)
-
-//implement get cpuid for gcc compilers using a system or local copy of cpuid.h
-#if defined(__GNUC__)
-#include <cpuid.h>
-#define cpuid_x86(op, r) __get_cpuid(op, (unsigned int *)r + 0, (unsigned int *)r + 1, (unsigned int *)r + 2, (unsigned int *)r + 3)
-#define cpuid_x86_count(op, count, regs) __cpuid_count(op, count, *((unsigned int *)regs), *((unsigned int *)regs + 1), *((unsigned int *)regs + 2), *((unsigned int *)regs + 3))
-
-/* Return Intel AVX extended CPU capabilities register.
-     * This function will bomb on non-AVX-capable machines, so
-     * check for AVX capability before executing.
-     */
-#if ((__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 2) || (__clang_major__ >= 3)) && defined(HAVE_XGETBV)
-static inline unsigned long long _xgetbv(unsigned int index)
-{
-    unsigned int eax, edx;
-    __VOLK_ASM __VOLK_VOLATILE("xgetbv"
-                               : "=a"(eax), "=d"(edx)
-                               : "c"(index));
-    return ((unsigned long long)edx << 32) | eax;
-}
-#define __xgetbv() _xgetbv(0)
-#else
-#define __xgetbv() 0
-#endif
-
-//implement get cpuid for MSVC compilers using __cpuid intrinsic
-#elif defined(_MSC_VER) && defined(HAVE_INTRIN_H)
-#include <intrin.h>
-#define cpuid_x86(op, r) __cpuid(((int *)r), op)
-#define cpuid_x86_count(op, count, regs) __cpuidex((int *)regs, op, count)
-
-#if defined(_XCR_XFEATURE_ENABLED_MASK)
-#define __xgetbv() _xgetbv(_XCR_XFEATURE_ENABLED_MASK)
-#else
-#define __xgetbv() 0
-#endif
-
-#else
-#error "A get cpuid for volk_gnsssdr is not available on this compiler..."
-#endif  //defined(__GNUC__)
-
-#endif  //defined(VOLK_CPU_x86)
-
-static inline unsigned int cpuid_count_x86_bit(unsigned int level, unsigned int count, unsigned int reg, unsigned int bit)
-{
-#if defined(VOLK_CPU_x86)
-    unsigned int regs[4] = {0};
-    cpuid_x86_count(level, count, regs);
-    return regs[reg] >> bit & 0x01;
-#else
-    return 0;
-#endif
-}
-
-static inline unsigned int cpuid_x86_bit(unsigned int reg, unsigned int op, unsigned int bit)
-{
-#if defined(VOLK_CPU_x86)
-    unsigned int regs[4];
-    memset(regs, 0, sizeof(unsigned int) * 4);
-    cpuid_x86(op, regs);
-    return regs[reg] >> bit & 0x01;
-#else
-    return 0;
-#endif
-}
-
-static inline unsigned int check_extended_cpuid(unsigned int val)
-{
-#if defined(VOLK_CPU_x86)
-    unsigned int regs[4];
-    memset(regs, 0, sizeof(unsigned int) * 4);
-    cpuid_x86(0x80000000, regs);
-    return regs[0] >= val;
-#else
-    return 0;
-#endif
-}
-
-static inline unsigned int get_avx_enabled(void)
-{
-#if defined(VOLK_CPU_x86)
-    return __xgetbv() & 0x6;
-#else
-    return 0;
-#endif
-}
-
-static inline unsigned int get_avx2_enabled(void)
-{
-#if defined(VOLK_CPU_x86)
-    return __xgetbv() & 0x6;
-#else
-    return 0;
-#endif
-}
-
-static inline unsigned int get_avx512_enabled(void)
-{
-#if defined(VOLK_CPU_x86)
-    return __xgetbv() & 0xE6;  //check for zmm, xmm and ymm regs
-#else
-    return 0;
-#endif
-}
-
-//neon detection is linux specific
-#if defined(__arm__) && defined(__linux__)
-#include <asm/hwcap.h>
-#include <linux/auxvec.h>
-#include <stdio.h>
-#define VOLK_CPU_ARMV7
-#endif
-
-static int has_neonv7(void)
-{
-#if defined(VOLK_CPU_ARMV7)
-    FILE *auxvec_f;
-    unsigned long auxvec[2];
-    unsigned int found_neon = 0;
-    auxvec_f = fopen("/proc/self/auxv", "rb");
-    if (!auxvec_f) return 0;
-
-    size_t r = 1;
-    //so auxv is basically 32b of ID and 32b of value
-    //so it goes like this
-    while (!found_neon && r)
-        {
-            r = fread(auxvec, sizeof(unsigned long), 2, auxvec_f);
-            if ((auxvec[0] == AT_HWCAP) && (auxvec[1] & HWCAP_NEON))
-                found_neon = 1;
-        }
-
-    fclose(auxvec_f);
-    return found_neon;
-#else
-    return 0;
-#endif
-}
-
-//\todo: Fix this to really check for neon on aarch64
-//neon detection is linux specific
-#if defined(__aarch64__) && defined(__linux__)
-#include <asm/hwcap.h>
-#include <linux/auxvec.h>
-#include <stdio.h>
-#define VOLK_CPU_ARMV8
-#endif
-
-static int has_neonv8(void)
-{
-#if defined(VOLK_CPU_ARMV8)
-    FILE *auxvec_f;
-    unsigned long auxvec[2];
-    unsigned int found_neon = 0;
-    auxvec_f = fopen("/proc/self/auxv", "rb");
-    if (!auxvec_f) return 0;
-
-    size_t r = 1;
-    //so auxv is basically 32b of ID and 32b of value
-    //so it goes like this
-    while (!found_neon && r)
-        {
-            r = fread(auxvec, sizeof(unsigned long), 2, auxvec_f);
-            if ((auxvec[0] == AT_HWCAP) && (auxvec[1] & HWCAP_ASIMD))
-                found_neon = 1;
-        }
-
-    fclose(auxvec_f);
-    return found_neon;
-#else
-    return 0;
-#endif
-}
-
-static int has_neon(void)
-{
-#if defined(VOLK_CPU_ARMV8) || defined(VOLK_CPU_ARMV7)
-    if (has_neonv7() || has_neonv8())
-        return 1;
-    else
-        return 0;
-#else
-    return 0;
-#endif
-}
 // clang-format off
 
 %for arch in archs:
 static int i_can_has_${arch.name} (void) {
     %for check, params in arch.checks:
-    if (${check}(<% joined_params = ', '.join(params)%>${joined_params}) == 0) return 0;
+      %if "neon" in arch.name:
+#if defined(CPU_FEATURES_ARCH_ARM)
+    if (GetArmInfo().features.${check} == 0){ return 0; }
+#endif
+    %else:
+#if defined(CPU_FEATURES_ARCH_X86)
+    if (GetX86Info().features.${check} == 0){ return 0; }
+#endif
+    %endif
     %endfor
     return 1;
 }

src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/tmpl/volk_gnsssdr_cpu.tmpl.old.c

@@ -0,0 +1,259 @@
+/* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software-defined Global Navigation Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+// clang-format off
+#include <volk_gnsssdr/volk_gnsssdr_cpu.h>
+#include <volk_gnsssdr/volk_gnsssdr_config_fixed.h>
+#include <stdlib.h>
+#include <string.h>
+// clang-format on
+
+struct VOLK_CPU volk_gnsssdr_cpu;
+
+#if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
+#define VOLK_CPU_x86
+#endif
+
+#if defined(VOLK_CPU_x86)
+
+//implement get cpuid for gcc compilers using a system or local copy of cpuid.h
+#if defined(__GNUC__)
+#include <cpuid.h>
+#define cpuid_x86(op, r) __get_cpuid(op, (unsigned int *)r + 0, (unsigned int *)r + 1, (unsigned int *)r + 2, (unsigned int *)r + 3)
+#define cpuid_x86_count(op, count, regs) __cpuid_count(op, count, *((unsigned int *)regs), *((unsigned int *)regs + 1), *((unsigned int *)regs + 2), *((unsigned int *)regs + 3))
+
+/* Return Intel AVX extended CPU capabilities register.
+     * This function will bomb on non-AVX-capable machines, so
+     * check for AVX capability before executing.
+     */
+#if ((__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 2) || (__clang_major__ >= 3)) && defined(HAVE_XGETBV)
+static inline unsigned long long _xgetbv(unsigned int index)
+{
+    unsigned int eax, edx;
+    __VOLK_ASM __VOLK_VOLATILE("xgetbv"
+                               : "=a"(eax), "=d"(edx)
+                               : "c"(index));
+    return ((unsigned long long)edx << 32) | eax;
+}
+#define __xgetbv() _xgetbv(0)
+#else
+#define __xgetbv() 0
+#endif
+
+//implement get cpuid for MSVC compilers using __cpuid intrinsic
+#elif defined(_MSC_VER) && defined(HAVE_INTRIN_H)
+#include <intrin.h>
+#define cpuid_x86(op, r) __cpuid(((int *)r), op)
+#define cpuid_x86_count(op, count, regs) __cpuidex((int *)regs, op, count)
+
+#if defined(_XCR_XFEATURE_ENABLED_MASK)
+#define __xgetbv() _xgetbv(_XCR_XFEATURE_ENABLED_MASK)
+#else
+#define __xgetbv() 0
+#endif
+
+#else
+#error "A get cpuid for volk_gnsssdr is not available on this compiler..."
+#endif  //defined(__GNUC__)
+
+#endif  //defined(VOLK_CPU_x86)
+
+static inline unsigned int cpuid_count_x86_bit(unsigned int level, unsigned int count, unsigned int reg, unsigned int bit)
+{
+#if defined(VOLK_CPU_x86)
+    unsigned int regs[4] = {0};
+    cpuid_x86_count(level, count, regs);
+    return regs[reg] >> bit & 0x01;
+#else
+    return 0;
+#endif
+}
+
+static inline unsigned int cpuid_x86_bit(unsigned int reg, unsigned int op, unsigned int bit)
+{
+#if defined(VOLK_CPU_x86)
+    unsigned int regs[4];
+    memset(regs, 0, sizeof(unsigned int) * 4);
+    cpuid_x86(op, regs);
+    return regs[reg] >> bit & 0x01;
+#else
+    return 0;
+#endif
+}
+
+static inline unsigned int check_extended_cpuid(unsigned int val)
+{
+#if defined(VOLK_CPU_x86)
+    unsigned int regs[4];
+    memset(regs, 0, sizeof(unsigned int) * 4);
+    cpuid_x86(0x80000000, regs);
+    return regs[0] >= val;
+#else
+    return 0;
+#endif
+}
+
+static inline unsigned int get_avx_enabled(void)
+{
+#if defined(VOLK_CPU_x86)
+    return __xgetbv() & 0x6;
+#else
+    return 0;
+#endif
+}
+
+static inline unsigned int get_avx2_enabled(void)
+{
+#if defined(VOLK_CPU_x86)
+    return __xgetbv() & 0x6;
+#else
+    return 0;
+#endif
+}
+
+static inline unsigned int get_avx512_enabled(void)
+{
+#if defined(VOLK_CPU_x86)
+    return __xgetbv() & 0xE6;  //check for zmm, xmm and ymm regs
+#else
+    return 0;
+#endif
+}
+
+//neon detection is linux specific
+#if defined(__arm__) && defined(__linux__)
+#include <asm/hwcap.h>
+#include <linux/auxvec.h>
+#include <stdio.h>
+#define VOLK_CPU_ARMV7
+#endif
+
+static int has_neonv7(void)
+{
+#if defined(VOLK_CPU_ARMV7)
+    FILE *auxvec_f;
+    unsigned long auxvec[2];
+    unsigned int found_neon = 0;
+    auxvec_f = fopen("/proc/self/auxv", "rb");
+    if (!auxvec_f) return 0;
+
+    size_t r = 1;
+    //so auxv is basically 32b of ID and 32b of value
+    //so it goes like this
+    while (!found_neon && r)
+        {
+            r = fread(auxvec, sizeof(unsigned long), 2, auxvec_f);
+            if ((auxvec[0] == AT_HWCAP) && (auxvec[1] & HWCAP_NEON))
+                found_neon = 1;
+        }
+
+    fclose(auxvec_f);
+    return found_neon;
+#else
+    return 0;
+#endif
+}
+
+//\todo: Fix this to really check for neon on aarch64
+//neon detection is linux specific
+#if defined(__aarch64__) && defined(__linux__)
+#include <asm/hwcap.h>
+#include <linux/auxvec.h>
+#include <stdio.h>
+#define VOLK_CPU_ARMV8
+#endif
+
+static int has_neonv8(void)
+{
+#if defined(VOLK_CPU_ARMV8)
+    FILE *auxvec_f;
+    unsigned long auxvec[2];
+    unsigned int found_neon = 0;
+    auxvec_f = fopen("/proc/self/auxv", "rb");
+    if (!auxvec_f) return 0;
+
+    size_t r = 1;
+    //so auxv is basically 32b of ID and 32b of value
+    //so it goes like this
+    while (!found_neon && r)
+        {
+            r = fread(auxvec, sizeof(unsigned long), 2, auxvec_f);
+            if ((auxvec[0] == AT_HWCAP) && (auxvec[1] & HWCAP_ASIMD))
+                found_neon = 1;
+        }
+
+    fclose(auxvec_f);
+    return found_neon;
+#else
+    return 0;
+#endif
+}
+
+static int has_neon(void)
+{
+#if defined(VOLK_CPU_ARMV8) || defined(VOLK_CPU_ARMV7)
+    if (has_neonv7() || has_neonv8())
+        return 1;
+    else
+        return 0;
+#else
+    return 0;
+#endif
+}
+// clang-format off
+
+%for arch in archs:
+static int i_can_has_${arch.name} (void) {
+    %for check, params in arch.checks:
+    if (${check}(<% joined_params = ', '.join(params)%>${joined_params}) == 0) return 0;
+    %endfor
+    return 1;
+}
+%endfor
+
+#if defined(HAVE_FENV_H)
+    #if defined(FE_TONEAREST)
+        #include <fenv.h>
+        static inline void set_float_rounding(void){
+            fesetround(FE_TONEAREST);
+        }
+    #else
+        static inline void set_float_rounding(void){
+            //do nothing
+        }
+    #endif
+#elif defined(_MSC_VER)
+    #include <float.h>
+    static inline void set_float_rounding(void){
+        unsigned int cwrd;
+        _controlfp_s(&cwrd, 0, 0);
+        _controlfp_s(&cwrd, _RC_NEAR, _MCW_RC);
+    }
+#else
+    static inline void set_float_rounding(void){
+        //do nothing
+    }
+#endif
+
+void volk_gnsssdr_cpu_init() {
+    %for arch in archs:
+    volk_gnsssdr_cpu.has_${arch.name} = &i_can_has_${arch.name};
+    %endfor
+    set_float_rounding();
+}
+
+unsigned int volk_gnsssdr_get_lvarch() {
+    unsigned int retval = 0;
+    volk_gnsssdr_cpu_init();
+    %for arch in archs:
+    retval += volk_gnsssdr_cpu.has_${arch.name}() << LV_${arch.name.upper()};
+    %endfor
+    return retval;
+}
+// clang-format on