Created
June 14, 2021 05:03
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#include <stdio.h> | |
#include <chrono> | |
#include <inttypes.h> | |
#include <math.h> | |
using Clock = std::chrono::high_resolution_clock; | |
using Timepoint = Clock::time_point; | |
static inline void mysincos(float a, float * __restrict s, float * __restrict c) | |
{ | |
__asm__( | |
"fsincos\n\t" | |
: [c] "+t" (a) | |
, [s] "=u" (*s) | |
); | |
*c = a; | |
} | |
int main() | |
{ | |
float c, s; | |
float p = 3.14159265358979323f; | |
size_t iters = 1048576; | |
float d = p / (iters * 0.5f); | |
float a = 0; | |
volatile float v; | |
Timepoint st = Clock::now(); | |
for (size_t i = 0; i < iters; ++i) { | |
float a = i * d - p; | |
mysincos(a, &s, &c); | |
v=s; | |
v=c; | |
} | |
Timepoint en = Clock::now(); | |
printf("fsincos %" PRIu64 "\n", (uint64_t)std::chrono::duration_cast< | |
std::chrono::nanoseconds>(en - st).count() / iters); | |
st = Clock::now(); | |
for (size_t i = 0; i < iters; ++i) { | |
float a = i * d - p; | |
s = sinf(a); | |
c = cosf(a); | |
v=s; | |
v=c; | |
} | |
en = Clock::now(); | |
printf("sin cos %" PRIu64 "\n", (uint64_t)std::chrono::duration_cast< | |
std::chrono::nanoseconds>(en - st).count() / iters); | |
} |
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