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Exercício 1 #7

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72 changes: 31 additions & 41 deletions sse.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
Exemplo de código SSE utilizando Intel instrinsics e gcc built-in functions

Compile usando:
gcc sse.c -o sse -msse -msse4.2 -O3
gcc sse.c -o sse -msse -msse4.2


http://www.songho.ca/misc/sse/sse.html
Expand All @@ -24,7 +24,6 @@ AVX
#include <pmmintrin.h> // SSE3
#include <smmintrin.h> // SSE4.1


#define VECTOR_SIZE 4
typedef float v4sf __attribute__ ((vector_size(sizeof(float)*VECTOR_SIZE)));

Expand All @@ -34,7 +33,6 @@ typedef union f4vector
float f[VECTOR_SIZE];
} f4vector;


void add_intel_intrinsics(float *a, float *b, float *c)
{
__m128 va = _mm_load_ps (a);
Expand All @@ -52,60 +50,52 @@ void add_intel_intrinsics(float *a, float *b, float *c)
*/
}



v4sf add_gcc_builtin(v4sf a, v4sf b)
{
return __builtin_ia32_addps (a, b);
}



int main (int argc, char *argv[])
{
float *a __attribute__ ((aligned(16))) = (float*)malloc (sizeof(float) * 4); //aloca um vetor de 16bytes (128bits) alinhado em endereços múltiplos de 16bytes.
float *b __attribute__ ((aligned(16))) = (float*)malloc (sizeof(float) * 4);
float *c __attribute__ ((aligned(16))) = (float*)malloc (sizeof(float) * 4);


int i = 0;

int j = 10;
int x, y, w=2,h=2, c=0;
for (i = 0; i < 4; ++i) {
a[i] = i;
b[i] = i;
a[i] = 200+j;
b[i] = 10;
j = j +10;
}

printf("Intel SSE\n");

add_intel_intrinsics(a, b, c);

printf("vetor A \n");
for (i = 0; i < 4; ++i) {
printf("%f\n", c[i]);
printf("%.2f\n", a[i]);
}

free(a);
free(b);
free(c);

printf("\nGCC Built-in Functions\n");

v4sf d, e, f;

d = (v4sf){0, 1, 2, 3};
e = (v4sf){0, 1, 2, 3};
f = add_gcc_builtin(d, e);

printf("\nvetor B \n");
for (i = 0; i < 4; ++i) {
printf("%f\n", f[i]);
printf("%.2f\n", b[i]);
}


printf("\nGCC implicity vectorization\n");

f = d + e;
for(i=0;i<(h*w);i+=4){
__m128 img= _mm_load_ps(a);
__m128 intensidade= _mm_load_ps(b);
__m128 r = _mm_add_ps(img,intensidade);
_mm_store_ps(b,r);
c+=4;
}


printf("\nvetor Alterado\n");
for(y=0;y<h;++y){
for(x=0;x<w;++x){
printf("%.2f \n",b[y*w+x]);
}
}
/* printf("vetor Alterado \n");
for (i = 0; i < 4; ++i) {
printf("%f\n", f[i]);
}
printf("%.2f\n", b[i]);
}*/

free(a);
free(b);

return 0;
}