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// -*-C++-*-
#define NDEBUG
#define VML_NODEBUG
#include "vecmathlib.h"
#include <cmath>
#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <string>
#include <sys/time.h>
using namespace std;
using namespace vecmathlib;
typedef unsigned long long ticks;
inline ticks getticks()
{
ticks a, d;
asm volatile("rdtsc" : "=a" (a), "=d" (d));
return a | (d << 32);
}
inline double elapsed(ticks t1, ticks t0)
{
return t1-t0;
}
double get_sys_time()
{
timeval tp;
gettimeofday(&tp, NULL);
return tp.tv_sec + 1.0e-6 * tp.tv_usec;
}
double measure_tick()
{
ticks const rstart = getticks();
double const wstart = get_sys_time();
while (get_sys_time() - wstart < 0.1) {
// do nothing, just wait
}
ticks const rend = getticks();
double const wend = get_sys_time();
assert(wend-wstart >= 0.09);
return (wend - wstart) / elapsed(rend, rstart);
}
double global_result = 0.0;
template<typename realvec_t>
void save_result(realvec_t result)
{
for (int i=0; i<realvec_t::size; ++i) {
global_result += result[i];
}
}
template<typename T> inline T nop(T x) { return x; }
#define DECLARE_FUNCTOR(func) \
template<typename T> \
struct functor_##func { \
static char const* name() { return #func; } \
T operator()(T x) { return func(x); } \
}
DECLARE_FUNCTOR(nop);
DECLARE_FUNCTOR(sqrt);
DECLARE_FUNCTOR(exp);
DECLARE_FUNCTOR(log);
DECLARE_FUNCTOR(sin);
DECLARE_FUNCTOR(cos);
DECLARE_FUNCTOR(atan);
template<typename realvec_t, template<typename> class func_t>
double run_bench()
{
realvec_t x0, dx;
for (int i=0; i<realvec_t::size; ++i) {
x0.set_elt(i, 1.0f + float(i));
dx.set_elt(i, 1.0e-6f);
}
realvec_t x, y;
ticks t0, t1;
double const cycles_per_tick = 1.0; // measure_tick();
int const numiters = 10000000;
func_t<realvec_t> func;
t0 = getticks();
x = y = x0;
for (int n=0; n<numiters; ++n) {
y += func(x);
x += dx;
}
t1 = getticks();
save_result(y);
return cycles_per_tick * elapsed(t1,t0) * realvec_t::size / numiters;
}
template<typename realvec_t, template<typename> class func_t>
void bench_type_func()
{
cout << " "
<< setw(-5) << func_t<realvec_t>::name() << " "
<< setw(17) << realvec_t::name() << ": " << flush;
double const cycles = run_bench<realvec_t, func_t>();
cout << cycles << " cycles\n" << flush;
}
template<template<typename> class func_t>
void bench_func()
{
cout << "\n"
<< "Benchmarking " << func_t<float>().name() << ":\n";
bench_type_func<realpseudovec<float,1>, func_t>();
bench_type_func<realtestvec<float,1>, func_t>();
#ifdef VECMATHLIB_HAVE_VEC_FLOAT_1
bench_type_func<realvec<float,1>, func_t>();
#endif
#ifdef VECMATHLIB_HAVE_VEC_FLOAT_4
bench_type_func<realpseudovec<float,4>, func_t>();
bench_type_func<realtestvec<float,4>, func_t>();
bench_type_func<realvec<float,4>, func_t>();
#endif
#ifdef VECMATHLIB_HAVE_VEC_FLOAT_8
bench_type_func<realpseudovec<float,8>, func_t>();
bench_type_func<realtestvec<float,8>, func_t>();
bench_type_func<realvec<float,8>, func_t>();
#endif
bench_type_func<realpseudovec<double,1>, func_t>();
bench_type_func<realtestvec<double,1>, func_t>();
#ifdef VECMATHLIB_HAVE_VEC_DOUBLE_1
bench_type_func<realvec<double,1>, func_t>();
#endif
#ifdef VECMATHLIB_HAVE_VEC_DOUBLE_2
bench_type_func<realpseudovec<double,2>, func_t>();
bench_type_func<realtestvec<double,2>, func_t>();
bench_type_func<realvec<double,2>, func_t>();
#endif
#ifdef VECMATHLIB_HAVE_VEC_DOUBLE_4
bench_type_func<realpseudovec<double,4>, func_t>();
bench_type_func<realtestvec<double,4>, func_t>();
bench_type_func<realvec<double,4>, func_t>();
#endif
}
void bench()
{
bench_func<functor_nop>();
bench_func<functor_sqrt>();
bench_func<functor_exp>();
bench_func<functor_log>();
bench_func<functor_sin>();
bench_func<functor_cos>();
bench_func<functor_atan>();
}
int main(int argc, char** argv)
{
using namespace vecmathlib;
cout << "Benchmarking math functions:\n";
bench();
// Checking global accumulator to prevent optimisation
if (! std::isfinite(global_result)) {
cout << "\n"
<< "WARNING: Global accumulator is not finite\n";
}
return 0;
}
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