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

   1 /* Prefetching when the step is loop invariant.  */
   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
   6
   7 double data[16384];
   8 void prefetch_when_non_constant_step_is_invariant(int step, int n)
   9 {
  10      int a;
  11      int b;
  12      for (a = 1; a < step; a++) {
  13         for (b = 0; b < n; b += 2 * step) {
  14
  15           int i = 2*(b + a);
  16           int j = 2*(b + a + step);
  17
  18
  19           data[j]   = data[i];
  20           data[j+1] = data[i+1];
  21         }
  22      }
  23 }
  24
  25 /* { dg-final { scan-tree-dump "Issued prefetch" "aprefetch" } } */
  26 /* { dg-final { scan-assembler "prefetcht0" } } */
  27
  28 /* { dg-final { cleanup-tree-dump "aprefetch" } } */