gcc/testsuite/gcc.dg/tree-ssa/prefetch-7.c

   1 /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
   2 /* { dg-options "-O2 -fprefetch-loop-arrays -march=amdfam10 --param simultaneous-prefetches=100 -fdump-tree-aprefetch-details -fdump-tree-optimized" } */
   3
   4 #define K 1000000
   5 int a[K];
   6
   7 void test(int *p)
   8 {
   9   unsigned i;
  10
  11   /* Nontemporal store should not be used here (only write and read temporal
  12      prefetches).  */
  13   for (i = 0; i < K - 10000; i++)
  14     a[i + 10000] = a[i];
  15
  16   /* Nontemporal store should not be used here (only write and read nontemporal
  17      prefetches).  */
  18   for (i = 0; i < K - 100000; i++)
  19     a[i + 100000] = a[i];
  20
  21   /* Nontemporal store should be used neither for a nor for p, as we do not know
  22      whether they alias or not.  */
  23   for (i = 0; i < K; i++)
  24     {
  25       a[i] = 0;
  26       *p++ = 1;
  27     }
  28
  29   /* Nontemporal store should not be used for a, as we do not know whether its
  30      value will be reused or not.  */
  31   for (i = 0; i < 1000; i++)
  32     a[i] = 0;
  33 }
  34
  35 /* { dg-final { scan-tree-dump-times "Issued prefetch" 5 "aprefetch" } } */
  36 /* { dg-final { scan-tree-dump-times "Issued nontemporal prefetch" 2 "aprefetch" } } */
  37 /* { dg-final { scan-tree-dump-times "a nontemporal store" 0 "aprefetch" } } */
  38
  39 /* { dg-final { scan-tree-dump-times "builtin_prefetch" 7 "optimized" } } */