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[v1.01] Do not use FMA for frequency measurement. It is sufficient to run any other AVX instructions, and some CPUs support AVX but not FMA.

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Dr-Noob
2021-11-20 10:25:36 +01:00
parent 4b50740516
commit fe3bc6163c
3 changed files with 12 additions and 14 deletions
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5
src/x86/freq/freq_avx.c
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@@ -17,12 +17,11 @@ void* compute_avx() {
__m256 a = _mm256_set1_ps(1.5);
__m256 b = _mm256_set1_ps(1.2);
__m256 c = _mm256_set1_ps(0.0);
gettimeofday(&begin, NULL);
while(!end) {
for(uint64_t i=0; i < LOOP_ITERS; i++) {
c = _mm256_fmadd_ps(a, b, c);
a = _mm256_add_ps(a, b);
}
gettimeofday(&now, NULL);
@@ -35,7 +34,7 @@ void* compute_avx() {
printf("fopen: %s", strerror(errno));
}
else {
fprintf(fp, "%f", c[0]);
fprintf(fp, "%f", a[0]);
fclose(fp);
}

17
src/x86/freq/freq_avx512.c
View File

@@ -23,7 +23,6 @@ void* compute_avx512() {
__m512 a[8];
__m512 b[8];
__m512 mult;
for(int i=0; i < 8; i++) {
a[i] = _mm512_set1_ps(1.5);
@@ -33,14 +32,14 @@ void* compute_avx512() {
gettimeofday(&begin, NULL);
while(!end) {
for(uint64_t i=0; i < LOOP_ITERS; i++) {
a[0] = _mm512_fmadd_ps(mult, a[0], b[0]);
a[1] = _mm512_fmadd_ps(mult, a[1], b[1]);
a[2] = _mm512_fmadd_ps(mult, a[2], b[2]);
a[3] = _mm512_fmadd_ps(mult, a[3], b[3]);
a[4] = _mm512_fmadd_ps(mult, a[4], b[4]);
a[5] = _mm512_fmadd_ps(mult, a[5], b[5]);
a[6] = _mm512_fmadd_ps(mult, a[6], b[6]);
a[7] = _mm512_fmadd_ps(mult, a[7], b[7]);
a[0] = _mm512_add_ps(a[0], b[0]);
a[1] = _mm512_add_ps(a[1], b[1]);
a[2] = _mm512_add_ps(a[2], b[2]);
a[3] = _mm512_add_ps(a[3], b[3]);
a[4] = _mm512_add_ps(a[4], b[4]);
a[5] = _mm512_add_ps(a[5], b[5]);
a[6] = _mm512_add_ps(a[6], b[6]);
a[7] = _mm512_add_ps(a[7], b[7]);
}
gettimeofday(&now, NULL);