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https://github.com/Dr-Noob/cpufetch.git
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47 lines
954 B
C
47 lines
954 B
C
#include <stdio.h>
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#include <immintrin.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <sys/time.h>
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#include <time.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#include <stdint.h>
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#define MEASURE_TIME_SECONDS 5
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#define LOOP_ITERS 100000000
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void* compute_avx() {
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bool end = false;
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struct timeval begin, now;
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__m256 a = _mm256_set1_ps(1.5);
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__m256 b = _mm256_set1_ps(1.2);
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__m256 c = _mm256_set1_ps(0.0);
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gettimeofday(&begin, NULL);
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while(!end) {
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for(uint64_t i=0; i < LOOP_ITERS; i++) {
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c = _mm256_fmadd_ps(a, b, c);
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}
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gettimeofday(&now, NULL);
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double elapsed = (now.tv_sec - begin.tv_sec) + ((now.tv_usec - begin.tv_usec)/1000000.0);
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end = elapsed >= (double) MEASURE_TIME_SECONDS;
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}
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FILE* fp = fopen("/dev/null", "w");
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if(fp == NULL) {
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printf("fopen: %s", strerror(errno));
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}
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else {
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fprintf(fp, "%f", c[0]);
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fclose(fp);
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}
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return NULL;
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}
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