1 /* Test the attribute((optimize)) really works. Do this test by checking 2 whether we vectorize a simple loop. */ 3 /* { dg-do compile } */ 4 /* { dg-options "-O1 -msse2 -mfpmath=sse -march=k8 --param min-insn-to-prefetch-ratio=0" } */ 5 /* { dg-final { scan-assembler "prefetcht0" } } */ 6 /* { dg-final { scan-assembler "addps" } } */ 7 /* { dg-final { scan-assembler "subss" } } */ 8 9 #define SIZE 10240 10 float a[SIZE] __attribute__((__aligned__(32))); 11 float b[SIZE] __attribute__((__aligned__(32))); 12 float c[SIZE] __attribute__((__aligned__(32))); 13 14 /* This should vectorize. */ 15 #pragma GCC push_options 16 #pragma GCC optimize (3, "unroll-all-loops", "-fprefetch-loop-arrays") 17 18 void opt3(void)19opt3 (void) 20 { 21 int i; 22 23 for (i = 0; i < SIZE; i++) 24 a[i] = b[i] + c[i]; 25 } 26 27 #pragma GCC pop_options 28 29 /* This should not vectorize. */ 30 void not_opt3(void)31not_opt3 (void) 32 { 33 int i; 34 35 for (i = 0; i < SIZE; i++) 36 a[i] = b[i] - c[i]; 37 } 38 39