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