Add atan2 benchmark

src/tests/benchmarks/CMakeLists.txt

@@ -102,6 +102,7 @@ add_benchmark(benchmark_copy)
 add_benchmark(benchmark_preamble core_system_parameters)
 add_benchmark(benchmark_detector core_system_parameters)
 add_benchmark(benchmark_reed_solomon core_system_parameters)
+add_benchmark(benchmark_atan2 Gnuradio::runtime)
 
 if(has_std_plus_void)
     target_compile_definitions(benchmark_detector PRIVATE -DCOMPILER_HAS_STD_PLUS_VOID=1)

src/tests/benchmarks/benchmark_atan2.cc

@@ -0,0 +1,57 @@
+/*!
+ * \file benchmark_atan2.cc
+ * \brief Benchmark for atan2 implementations
+ * \author Carles Fernandez-Prades, 2022. cfernandez(at)cttc.es
+ *
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2022  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include <benchmark/benchmark.h>
+#include <gnuradio/math.h>
+#include <cmath>
+#include <random>
+
+void bm_atan2(benchmark::State& state)
+{
+    std::random_device rd;
+    std::default_random_engine e2(rd());
+    std::uniform_real_distribution<> dist(-1.0, 1.0);
+
+    float a = dist(e2);
+    float b = dist(e2);
+    float c;
+    while (state.KeepRunning())
+        {
+            c = std::atan2(a, b);
+        }
+}
+
+
+void bm_fast_atan2(benchmark::State& state)
+{
+    std::random_device rd;
+    std::default_random_engine e2(rd());
+    std::uniform_real_distribution<> dist(-1.0, 1.0);
+
+    float a = dist(e2);
+    float b = dist(e2);
+    float c;
+    while (state.KeepRunning())
+        {
+            c = gr::fast_atan2f(a, b);
+        }
+}
+
+BENCHMARK(bm_atan2);
+BENCHMARK(bm_fast_atan2);
+
+BENCHMARK_MAIN();