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test for rdtsc

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Nils Kasulke
2020-04-20 18:53:56 +02:00
parent 51f8d9bf82
commit ae70aed4a7
2 changed files with 116 additions and 0 deletions
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49
measure/clock_measure.c Normal file
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/*
* not usable clock() isn't precise enough
*
*
*/
#include<stdio.h>
#include <stdint.h>
#include<time.h>
#include<stdlib.h>
void usage_and_exit();
int main(int argc, char* argv[]) {
if(argc != 4) usage_and_exit();
uint64_t t0, t1;
int a, b;
sscanf(argv[2], "%d", &a);
sscanf(argv[3], "%d", &b);
if(argv[1][0] == 'd') {
double out;
t0 = (uint64_t) clock();
out = (double) a / b;
t1 = (uint64_t) clock();
printf("out = %lf\n", out);
} else if(argv[1][0] == 'f') {
float out;
t0 = (uint64_t) clock();
out = (float) a / b;
t1 = (uint64_t) clock();
printf("out = %f\n", out);
} else if(argv[1][0] == 'i') {
int out;
t0 = (uint64_t) clock();
out = a / b;
t1 = (uint64_t) clock();
printf("out = %d\n", out);
} else {
usage_and_exit();
}
printf("clocks = %lu\n", t1 - t0);
}
void usage_and_exit() {
printf("<prog> <i|f|d> <a> <b>\n");
printf("i = integer\n");
printf("f = float\n");
printf("d = double\n");
exit(1);
}

67
measure/measure.c Normal file
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#include<stdio.h>
#ifdef _WIN32
#include <intrin.h>
#else
#include <x86intrin.h>
#endif
#include <stdint.h>
// Windows
#ifdef _WIN32
#include <intrin.h>
uint64_t rdtsc(){
return __rdtsc();
}
// Linux/GCC
#else
uint64_t rdtsc(){
unsigned int lo,hi;
__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
return ((uint64_t)hi << 32) | lo;
}
#endif
void usage_and_exit();
int main(int argc, char* argv[]) {
if(argc != 4) usage_and_exit();
uint64_t t0, t1;
int a, b;
sscanf(argv[2], "%d", &a);
sscanf(argv[3], "%d", &b);
if(argv[1][0] == 'x') {
printf("filler found\n");
} else if(argv[1][0] == 'i') {
int out;
t0 = rdtsc();
out = a + b;
t1 = rdtsc();
printf("out = %d\n", out);
} else if(argv[1][0] == 'f') {
float out;
t0 = rdtsc();
out = (float) a + b;
t1 = rdtsc();
printf("out = %f\n", out);
} else if(argv[1][0] == 'd') {
double out;
t0 = rdtsc();
out = (double) a + b;
t1 = rdtsc();
printf("out = %lf\n", out);
} else {
usage_and_exit();
}
printf("clocks = %lu\n", t1 - t0);
}
void usage_and_exit() {
printf("<prog> <i|f|d> <a> <b>\n");
printf("i = integer\n");
printf("f = float\n");
printf("d = double\n");
exit(1);
}