Attachment 9469 Details for Bug 20495 – Slower AVX example

Slower AVX example

test_sincos.c (text/x-csrc), 1.20 KB, created by Adam Stylinski on 2016-08-23 01:22:13 UTC

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Creator: Adam Stylinski

Created: 2016-08-23 01:22:13 UTC

Size: 1.20 KB

patch

obsolete

>#define _GNU_SOURCE
>#include <stdio.h>
>#include <stdlib.h>
>#include <math.h>
>
>#define TESTDIMX 128
>#define TESTDIMY 128
>
>#define NUMVALS 9000
>
>void testFunc(float *ain, float *bin, int *xs,
>              int *ys, size_t num, float *vals,
>              float *valsB, size_t height)
>{
>    for (int i = 0; i < num; ++i) {
>        int x = xs[i] - 1;
>        int y = ys[i] - 1;
>        int idx = height * y + x;
>
>        float a = fabsf(vals[i]);
>        float s, c;
>        sincosf(2.0f * (float)M_PI * valsB[i], &s, &c);
>
>        ain[idx] += a * c;
>        bin[idx] += a * s;
>    }
>}
>
>int main(void)
>{
>    float *a = malloc(sizeof(float) * TESTDIMX * TESTDIMY);
>    float *b = malloc(sizeof(float) * TESTDIMY * TESTDIMX);
>
>    int *x = malloc(sizeof(int) * NUMVALS);
>    int *y = malloc(sizeof(int) * NUMVALS);
>
>    float *valsA = malloc(sizeof(float) * NUMVALS);
>    float *valsB = malloc(sizeof(float) * NUMVALS);
>
>    for (size_t i = 0; i < NUMVALS; ++i) {
>       x[i] = i % TESTDIMX + 1; 
>       y[i] = i % TESTDIMY + 1;
>       valsA[i] = ((float)rand()/(float)(RAND_MAX)) * 20;
>       valsB[i] = ((float)rand()/(float)(RAND_MAX)) * (float)M_PI;
>    }
>
>    testFunc(a, b, x, y, NUMVALS, valsA, valsB, TESTDIMX); 
>
>    return 0;
>}

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Attachments on bug 20495: 9469 | 9476