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gnss-sdr/src/tests/unit-tests/arithmetic/conjugate_test.cc

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/*!
* \file conjugate_test.cc
* \brief This file implements tests for conjugation of long arrays.
* \author Carles Fernandez-Prades, 2012. cfernandez(at)cttc.es
*
*
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* -----------------------------------------------------------------------------
*
* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
* This file is part of GNSS-SDR.
*
* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
* SPDX-License-Identifier: GPL-3.0-or-later
*
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* -----------------------------------------------------------------------------
*/
#include <armadillo>
#include <volk/volk.h>
#include <volk_gnsssdr/volk_gnsssdr.h>
#include <volk_gnsssdr/volk_gnsssdr_alloc.h>
#include <algorithm>
#include <chrono>
#include <complex>
DEFINE_int32(size_conjugate_test, 100000, "Size of the arrays used for conjugate testing");
TEST(ConjugateTest, StandardCComplexImplementation)
{
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auto* input = new std::complex<float>[FLAGS_size_conjugate_test];
auto* output = new std::complex<float>[FLAGS_size_conjugate_test];
std::fill_n(input, FLAGS_size_conjugate_test, std::complex<float>(0.0, 0.0));
std::chrono::time_point<std::chrono::system_clock> start, end;
start = std::chrono::system_clock::now();
for (int i = 0; i < FLAGS_size_conjugate_test; i++)
{
output[i] = std::conj(input[i]);
}
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::cout << "Conjugate of a " << FLAGS_size_conjugate_test
<< "-length complex float vector in standard C finished in " << elapsed_seconds.count() * 1e6
<< " microseconds\n";
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delete[] input;
delete[] output;
ASSERT_LE(0, elapsed_seconds.count() * 1e6);
}
TEST(ConjugateTest, C11ComplexImplementation)
{
const std::vector<std::complex<float>> input(FLAGS_size_conjugate_test);
std::vector<std::complex<float>> output(FLAGS_size_conjugate_test);
std::chrono::time_point<std::chrono::system_clock> start, end;
start = std::chrono::system_clock::now();
int pos = 0;
for (const auto& item : input)
{
output[pos++] = std::conj(item);
}
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::cout << "Conjugate of a " << FLAGS_size_conjugate_test
<< " complex<float> vector (C++11-style) finished in " << elapsed_seconds.count() * 1e6
<< " microseconds\n";
ASSERT_LE(0, elapsed_seconds.count() * 1e6);
std::complex<float> expected(0, 0);
std::complex<float> result(0, 0);
for (const auto& item : output)
{
result += item;
}
ASSERT_EQ(expected, result);
}
TEST(ConjugateTest, ArmadilloComplexImplementation)
{
arma::cx_fvec input(FLAGS_size_conjugate_test, arma::fill::zeros);
arma::cx_fvec output(FLAGS_size_conjugate_test);
std::chrono::time_point<std::chrono::system_clock> start, end;
start = std::chrono::system_clock::now();
output = arma::conj(input);
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::cout << "Conjugate of a " << FLAGS_size_conjugate_test
<< "-length complex float Armadillo vector finished in " << elapsed_seconds.count() * 1e6
<< " microseconds\n";
ASSERT_LE(0, elapsed_seconds.count() * 1e6);
}
TEST(ConjugateTest, VolkComplexImplementation)
{
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auto* input = static_cast<std::complex<float>*>(volk_gnsssdr_malloc(FLAGS_size_conjugate_test * sizeof(std::complex<float>), volk_gnsssdr_get_alignment()));
auto* output = static_cast<std::complex<float>*>(volk_gnsssdr_malloc(FLAGS_size_conjugate_test * sizeof(std::complex<float>), volk_gnsssdr_get_alignment()));
std::fill_n(input, FLAGS_size_conjugate_test, std::complex<float>(0.0, 0.0));
std::chrono::time_point<std::chrono::system_clock> start, end;
start = std::chrono::system_clock::now();
volk_32fc_conjugate_32fc(output, input, FLAGS_size_conjugate_test);
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::cout << "Conjugate of a " << FLAGS_size_conjugate_test
<< "-length complex float vector using VOLK finished in " << elapsed_seconds.count() * 1e6
<< " microseconds\n";
ASSERT_LE(0, elapsed_seconds.count() * 1e6);
volk_gnsssdr_free(input);
volk_gnsssdr_free(output);
}
TEST(ConjugateTest, VolkComplexImplementationAlloc)
{
volk_gnsssdr::vector<std::complex<float>> input(FLAGS_size_conjugate_test, std::complex<float>(0.0, 0.0));
volk_gnsssdr::vector<std::complex<float>> output(FLAGS_size_conjugate_test);
std::chrono::time_point<std::chrono::system_clock> start, end;
start = std::chrono::system_clock::now();
volk_32fc_conjugate_32fc(output.data(), input.data(), FLAGS_size_conjugate_test);
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::cout << "Conjugate of a " << FLAGS_size_conjugate_test
<< "-length complex float vector using VOLK ALLOC finished in " << elapsed_seconds.count() * 1e6
<< " microseconds\n";
ASSERT_LE(0, elapsed_seconds.count() * 1e6);
}