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-require-effective-target sse2 } */
   4 /* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-march=*" } { "-march=athlon" } } */
   5 /* { dg-options "-O2 -fprefetch-loop-arrays -march=athlon -msse2 -mfpmath=sse --param simultaneous-prefetches=100 -fdump-tree-aprefetch-details -fdump-tree-optimized" } */
   6
   7 #define K 1000000
   8 int a[K], b[K];
   9
  10 void test(int *p)
  11 {
  12   unsigned i;
  13
  14   /* Nontemporal store should be used for a.  */
  15   for (i = 0; i < K; i++)
  16     a[i] = 0;
  17
  18   /* Nontemporal store should be used for a, nontemporal prefetch for b.  */
  19   for (i = 0; i < K; i++)
  20     a[i] = b[i];
  21
  22   /* Nontemporal store should not be used here (only write and read temporal
  23      prefetches).  */
  24   for (i = 0; i < K - 10000; i++)
  25     a[i + 10000] = a[i];
  26
  27   /* Nontemporal store should not be used here (only write and read nontemporal
  28      prefetches).  */
  29   for (i = 0; i < K - 100000; i++)
  30     a[i + 100000] = a[i];
  31
  32   /* Nontemporal store should be used neither for a nor for p, as we do not know
  33      whether they alias or not.  */
  34   for (i = 0; i < K; i++)
  35     {
  36       a[i] = 0;
  37       *p++ = 1;
  38     }
  39
  40   /* Nontemporal store should not be used for a, as we do not know whether its
  41      value will be reused or not.  */
  42   for (i = 0; i < 1000; i++)
  43     a[i] = 0;
  44 }
  45
  46 /* { dg-final { scan-tree-dump-times "Issued prefetch" 5 "aprefetch" } } */
  47 /* { dg-final { scan-tree-dump-times "Issued nontemporal prefetch" 3 "aprefetch" } } */
  48 /* { dg-final { scan-tree-dump-times "a nontemporal store" 2 "aprefetch" } } */
  49
  50 /* { dg-final { scan-tree-dump-times "builtin_prefetch" 8 "optimized" } } */
  51 /* { dg-final { scan-tree-dump-times "=\\{nt\\}" 18 "optimized" } } */
  52 /* { dg-final { scan-tree-dump-times "__builtin_ia32_mfence" 2 "optimized" } } */
  53
  54 /* { dg-final { scan-assembler-times "prefetchw" 5 } } */
  55 /* { dg-final { scan-assembler-times "prefetcht" 1 } } */
  56 /* { dg-final { scan-assembler-times "prefetchnta" 2 } } */
  57 /* { dg-final { scan-assembler-times "movnti" 18 } } */
  58 /* { dg-final { scan-assembler-times "mfence" 2 } } */
  59
  60 /* { dg-final { cleanup-tree-dump "aprefetch" } } */
  61 /* { dg-final { cleanup-tree-dump "optimized" } } */