mirror of https://github.com/gnss-sdr/gnss-sdr
237 lines
8.9 KiB
C++
237 lines
8.9 KiB
C++
/*!
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* \file correlator.cc
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* \brief Highly optimized vector correlator class
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* \authors <ul>
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* <li> Javier Arribas, 2011. jarribas(at)cttc.es
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* <li> Luis Esteve, 2012. luis(at)epsilon-formacion.com
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* </ul>
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*
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* Class that implements a high optimized vector correlator class.
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2014 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "correlator.h"
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#include <iostream>
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#define LV_HAVE_SSE3
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#include "volk_cw_epl_corr.h"
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unsigned long Correlator::next_power_2(unsigned long v)
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{
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return v;
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}
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void Correlator::Carrier_wipeoff_and_EPL_generic(int signal_length_samples, const gr_complex* input, gr_complex* carrier, gr_complex* E_code, gr_complex* P_code, gr_complex* L_code,gr_complex* E_out, gr_complex* P_out, gr_complex* L_out)
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{
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gr_complex bb_signal_sample(0,0);
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*E_out = 0;
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*P_out = 0;
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*L_out = 0;
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// perform Early, Prompt and Late correlation
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for(int i=0; i < signal_length_samples; ++i)
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{
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//Perform the carrier wipe-off
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bb_signal_sample = input[i] * carrier[i];
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// Now get early, late, and prompt values for each
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*E_out += bb_signal_sample * E_code[i];
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*P_out += bb_signal_sample * P_code[i];
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*L_out += bb_signal_sample * L_code[i];
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}
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}
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void Correlator::Carrier_wipeoff_and_EPL_volk(int signal_length_samples, const gr_complex* input, gr_complex* carrier, gr_complex* E_code, gr_complex* P_code, gr_complex* L_code, gr_complex* E_out, gr_complex* P_out, gr_complex* L_out, bool input_vector_unaligned)
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{
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gr_complex* bb_signal;
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//gr_complex* input_aligned;
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//todo: do something if posix_memalign fails
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if (posix_memalign((void**)&bb_signal, 16, signal_length_samples * sizeof(gr_complex)) == 0) {};
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if (input_vector_unaligned == true)
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{
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//todo: do something if posix_memalign fails
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//if (posix_memalign((void**)&input_aligned, 16, signal_length_samples * sizeof(gr_complex)) == 0){};
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//memcpy(input_aligned,input,signal_length_samples * sizeof(gr_complex));
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volk_32fc_x2_multiply_32fc_u(bb_signal, input, carrier, signal_length_samples);
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}
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else
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{
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/*
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* todo: There is a problem with the aligned version of volk_32fc_x2_multiply_32fc_a.
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* It crashes even if the is_aligned() work function returns true. Im keeping the unaligned version in both cases..
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*/
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//use directly the input vector
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volk_32fc_x2_multiply_32fc_u(bb_signal, input, carrier, signal_length_samples);
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}
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volk_32fc_x2_dot_prod_32fc_a(E_out, bb_signal, E_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(P_out, bb_signal, P_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(L_out, bb_signal, L_code, signal_length_samples);
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free(bb_signal);
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//if (input_vector_unaligned==false)
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//{
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// free(input_aligned);
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//}
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}
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void Correlator::Carrier_wipeoff_and_EPL_volk_custom(int signal_length_samples, const gr_complex* input, gr_complex* carrier,gr_complex* E_code, gr_complex* P_code, gr_complex* L_code, gr_complex* E_out, gr_complex* P_out, gr_complex* L_out, bool input_vector_unaligned)
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{
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volk_cw_epl_corr_u(input, carrier, E_code, P_code, L_code, E_out, P_out, L_out, signal_length_samples);
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}
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void Correlator::Carrier_wipeoff_and_VEPL_volk(int signal_length_samples, const gr_complex* input, gr_complex* carrier, gr_complex* VE_code, gr_complex* E_code, gr_complex* P_code, gr_complex* L_code, gr_complex* VL_code, gr_complex* VE_out, gr_complex* E_out, gr_complex* P_out, gr_complex* L_out, gr_complex* VL_out, bool input_vector_unaligned)
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{
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gr_complex* bb_signal;
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//gr_complex* input_aligned;
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//todo: do something if posix_memalign fails
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if (posix_memalign((void**)&bb_signal, 16, signal_length_samples * sizeof(gr_complex)) == 0) {};
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if (input_vector_unaligned == false)
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{
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//todo: do something if posix_memalign fails
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//if (posix_memalign((void**)&input_aligned, 16, signal_length_samples * sizeof(gr_complex)) == 0){};
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//memcpy(input_aligned,input,signal_length_samples * sizeof(gr_complex));
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volk_32fc_x2_multiply_32fc_u(bb_signal, input, carrier, signal_length_samples);
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}
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else
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{
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//use directly the input vector
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volk_32fc_x2_multiply_32fc_u(bb_signal, input, carrier, signal_length_samples);
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}
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volk_32fc_x2_dot_prod_32fc_a(VE_out, bb_signal, VE_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(E_out, bb_signal, E_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(P_out, bb_signal, P_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(L_out, bb_signal, L_code, signal_length_samples);
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volk_32fc_x2_dot_prod_32fc_a(VL_out, bb_signal, VL_code, signal_length_samples);
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free(bb_signal);
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//if (input_vector_unaligned == false)
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//{
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//free(input_aligned);
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//}
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}
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/*
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void Correlator::cpu_arch_test_volk_32fc_x2_dot_prod_32fc_a()
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{
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//
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//struct volk_func_desc desc=volk_32fc_x2_dot_prod_32fc_a_get_func_desc();
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volk_func_desc_t desc = volk_32fc_x2_dot_prod_32fc_get_func_desc();
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std::vector<std::string> arch_list;
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for(int i = 0; i < desc.n_archs; ++i)
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{
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//if(!(archs[i+1] & volk_get_lvarch())) continue; //this arch isn't available on this pc
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arch_list.push_back(std::string(desc.indices[i]));
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}
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//first let's get a list of available architectures for the test
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if(arch_list.size() < 2)
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{
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std::cout << "no architectures to test" << std::endl;
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this->volk_32fc_x2_dot_prod_32fc_a_best_arch = "generic";
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}
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else
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{
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std::cout << "Detected architectures in this machine for volk_32fc_x2_dot_prod_32fc_a:" << std::endl;
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for (unsigned int i=0; i < arch_list.size(); ++i)
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{
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std::cout << "Arch " << i << ":" << arch_list.at(i) << std::endl;
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}
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// TODO: Make a test to find the best architecture
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this->volk_32fc_x2_dot_prod_32fc_a_best_arch = arch_list.at(arch_list.size() - 1);
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}
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std::cout << "Selected architecture for volk_32fc_x2_dot_prod_32fc_a is " << this->volk_32fc_x2_dot_prod_32fc_a_best_arch << std::endl;
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}
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void Correlator::cpu_arch_test_volk_32fc_x2_multiply_32fc_a()
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{
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//
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volk_func_desc_t desc = volk_32fc_x2_multiply_32fc_a_get_func_desc();
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std::vector<std::string> arch_list;
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for(int i = 0; i < desc.n_archs; ++i)
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{
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//if(!(archs[i+1] & volk_get_lvarch())) continue; //this arch isn't available on this pc
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arch_list.push_back(std::string(desc.indices[i]));
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}
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this->volk_32fc_x2_multiply_32fc_a_best_arch = "generic";
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//first let's get a list of available architectures for the test
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if(arch_list.size() < 2)
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{
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std::cout << "no architectures to test" << std::endl;
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}
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else
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{
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std::cout << "Detected architectures in this machine for volk_32fc_x2_multiply_32fc_a:" << std::endl;
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for (unsigned int i=0; i < arch_list.size(); ++i)
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{
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std::cout << "Arch " << i << ":" << arch_list.at(i) << std::endl;
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if (arch_list.at(i).find("sse") != std::string::npos)
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{
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// TODO: Make a test to find the best architecture
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this->volk_32fc_x2_multiply_32fc_a_best_arch = arch_list.at(i);
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}
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}
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}
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std::cout << "Selected architecture for volk_32fc_x2_multiply_32fc_a_best_arch is " << this->volk_32fc_x2_multiply_32fc_a_best_arch << std::endl;
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}
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*/
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Correlator::Correlator ()
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{
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//cpu_arch_test_volk_32fc_x2_dot_prod_32fc_a();
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//cpu_arch_test_volk_32fc_x2_multiply_32fc_a();
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}
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Correlator::~Correlator ()
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{}
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