gcc/testsuite/gcc.target/i386/pr53397-2.c

   1 /* Not prefetching when the step is loop variant.  */
   2 /* { dg-do compile } */
   3 /* { 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" } */
   4
   5 double data[16384];
   6 void donot_prefetch_when_non_constant_step_is_variant(int step, int n)
   7 {
   8      int a;
   9      int b;
  10      for (a = 1; a < step; a++,step*=2) {
  11         for (b = 0; b < n; b += 2 * step) {
  12
  13           int i = 2*(b + a);
  14           int j = 2*(b + a + step);
  15
  16
  17           data[j]   = data[i];
  18           data[j+1] = data[i+1];
  19         }
  20      }
  21 }
  22
  23 /* { dg-final { scan-tree-dump "Not prefetching" "aprefetch" } } */
  24 /* { dg-final { scan-tree-dump "loop variant step" "aprefetch" } } */
  25
  26