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

   1 /* { dg-do compile { target i?86-*-* x86_64-*-* } } */
   2 /* { dg-require-effective-target ilp32 } */
   3 /* { dg-options "-O2 -fprefetch-loop-arrays -march=athlon -msse2 -mfpmath=sse --param simultaneous-prefetches=100 --param max-unrolled-insns=1 -fdump-tree-aprefetch-details -fdump-tree-final_cleanup" } */
   4
   5 #define K 1000000
   6 int a[K], b[K];
   7
   8 void test(int *p)
   9 {
  10   unsigned i;
  11
  12   /* Nontemporal store should be used for a.  */
  13   for (i = 0; i < K; i++)
  14     a[i] = 0;
  15
  16   /* Nontemporal store should be used for a, nontemporal prefetch for b.  */
  17   for (i = 0; i < K; i++)
  18     a[i] = b[i];
  19
  20   /* Nontemporal store should not be used here (only write and read temporal
  21      prefetches).  */
  22   for (i = 0; i < K - 10000; i++)
  23     a[i + 10000] = a[i];
  24
  25   /* Nontemporal store should not be used here (only write and read nontemporal
  26      prefetches).  */
  27   for (i = 0; i < K - 100000; i++)
  28     a[i + 100000] = a[i];
  29
  30   /* Nontemporal store should be used neither for a nor for p, as we do not know
  31      whether they alias or not.  */
  32   for (i = 0; i < K; i++)
  33     {
  34       a[i] = 0;
  35       *p++ = 1;
  36     }
  37
  38   /* Nontemporal store should not be used for a, as we do not know whether its
  39      value will be reused or not.  */
  40   for (i = 0; i < 1000; i++)
  41     a[i] = 0;
  42 }
  43
  44 /* { dg-final { scan-tree-dump-times "Issued prefetch" 5 "aprefetch" } } */
  45 /* { dg-final { scan-tree-dump-times "Issued nontemporal prefetch" 3 "aprefetch" } } */
  46 /* { dg-final { scan-tree-dump-times "nontemporal store" 2 "aprefetch" } } */
  47
  48 /* { dg-final { scan-tree-dump-times "builtin_prefetch" 8 "final_cleanup" } } */
  49 /* { dg-final { scan-tree-dump-times "=\\{nt\\}" 2 "final_cleanup" } } */
  50 /* { dg-final { scan-tree-dump-times "__builtin_ia32_mfence" 2 "final_cleanup" } } */
  51
  52 /* { dg-final { scan-assembler-times "prefetchw" 5 } } */
  53 /* { dg-final { scan-assembler-times "prefetcht" 1 } } */
  54 /* { dg-final { scan-assembler-times "prefetchnta" 2 } } */
  55 /* { dg-final { scan-assembler-times "movnti" 2 } } */
  56 /* { dg-final { scan-assembler-times "mfence" 2 } } */
  57
  58 /* { dg-final { cleanup-tree-dump "aprefetch" } } */
  59 /* { dg-final { cleanup-tree-dump "final_cleanup" } } */