1/* Not prefetching when the step is loop variant.  */
2/* { dg-do compile } */
3/* { dg-require-effective-target sse2 } */
4/* { dg-options "-O3 -msse2 -fprefetch-loop-arrays -fdump-tree-aprefetch-details --param min-insn-to-prefetch-ratio=3 --param simultaneous-prefetches=10 -fdump-tree-aprefetch-details" } */
5
6double data[16384];
7void donot_prefetch_when_non_constant_step_is_variant(int step, int n)
8{
9     int a;
10     int b;
11     for (a = 1; a < step; a++,step*=2) {
12        for (b = 0; b < n; b += 2 * step) {
13
14          int i = 2*(b + a);
15          int j = 2*(b + a + step);
16
17
18          data[j]   = data[i];
19          data[j+1] = data[i+1];
20        }
21     }
22}
23
24/* { dg-final { scan-tree-dump "Not prefetching" "aprefetch" } } */
25/* { dg-final { scan-tree-dump "loop variant step" "aprefetch" } } */
26
27/* { dg-final { cleanup-tree-dump "aprefetch" } } */
28
29