gcc/testsuite/gcc.target/i386/pr53397-1.c

   1 /* Prefetching when the step is loop invariant.  */
   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
   6 double data[16384];
   7 void prefetch_when_non_constant_step_is_invariant(int step, int n)
   8 {
   9      int a;
  10      int b;
  11      for (a = 1; a < step; a++) {
  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 "Issued prefetch" "aprefetch" } } */
  25 /* { dg-final { scan-assembler "prefetcht0" } } */
  26