mirrors/gnss-sdr
1
0
Fork 0
mirror of https://github.com/gnss-sdr/gnss-sdr synced 2025-04-12 22:03:20 +00:00
Code Issues Releases Wiki Activity

Added fixed point nco test. It is faster than std C++ in debug mode, but in release performs the same.

Browse Source 
git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@153 64b25241-fba3-4117-9849-534c7e92360d
This commit is contained in:
Carles Fernandez 2012-02-01 18:53:52 +00:00
parent a8f6695f58
commit ceef16081f
1 changed files with 33 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/tests/arithmetic/cordic_test.cc
View File

@ -37,6 +37,7 @@
#include <sys/time.h>
#include <algorithm>
#include <cstdlib> // for RAND_MAX
#include <gnuradio/gr_fxpt_nco.h>
TEST(Cordic_Test, StandardCIsFasterThanCordic)
@ -50,34 +51,58 @@ TEST(Cordic_Test, StandardCIsFasterThanCordic)
double sin_phase1 = 0;
double cos_phase2 = 0;
double sin_phase2 = 0;
double cos_phase3 = 0;
double sin_phase3 = 0;
gr_fxpt_nco* nco;
nco = new gr_fxpt_nco();
double niter = 10000000;
struct timeval tv;
gettimeofday(&tv, NULL);
long long int begin1 = tv.tv_sec * 1000000 + tv.tv_usec;
for(int i=0; i<niter; i++)
{
cordicPtr->cordic_get_cos_sin(phase, cos_phase1, sin_phase1);
}
gettimeofday(&tv, NULL);
long long int end1 = tv.tv_sec *1000000 + tv.tv_usec;
long long int begin2 = tv.tv_sec * 1000000 + tv.tv_usec;
gettimeofday(&tv, NULL);
long long int begin2 = tv.tv_sec * 1000000 + tv.tv_usec;
for(int i=0; i<niter; i++)
{
cos_phase2 = cos(phase);
sin_phase2 = sin(phase);
}
gettimeofday(&tv, NULL);
long long int end2 = tv.tv_sec *1000000 + tv.tv_usec;
std::cout << "CORDIC sin =" << sin_phase1 << ", cos =" << cos_phase1 << " computed " << niter << " times in " << (end1-begin1) << " microseconds" << std::endl;
std::cout << "STD sin =" << sin_phase2 << ", cos =" << cos_phase2 << " computed " << niter << " times in " << (end2-begin2) << " microseconds" << std::endl;
EXPECT_TRUE((end2-begin2) < (end1-begin1));
float phase_f;
phase_f = (float)phase;
gettimeofday(&tv, NULL);
long long int begin3 = tv.tv_sec * 1000000 + tv.tv_usec;
for(int i=0; i<niter; i++)
{
nco->set_phase(phase_f);
cos_phase3 = nco->cos();
sin_phase3 = nco->sin();
}
gettimeofday(&tv, NULL);
long long int end3 = tv.tv_sec *1000000 + tv.tv_usec;
delete nco;
delete cordicPtr;
std::cout << "CORDIC sin =" << sin_phase1 << ", cos =" << cos_phase1 << " computed " << niter << " times in " << (end1-begin1) << " microseconds" << std::endl;
std::cout << "STD sin =" << sin_phase2 << ", cos =" << cos_phase2 << " computed " << niter << " times in " << (end2-begin2) << " microseconds" << std::endl;
std::cout << "FXPT sin =" << sin_phase3 << ", cos =" << cos_phase3 << " computed " << niter << " times in " << (end3-begin3) << " microseconds" << std::endl;
EXPECT_TRUE((end2-begin2) < (end1-begin1)); // if true, standard C++ is faster than the cordic implementation
}