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)19 opt3 (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)31 not_opt3 (void)
32 {
33   int i;
34 
35   for (i = 0; i < SIZE; i++)
36     a[i] = b[i] - c[i];
37 }
38 
39