gcc/testsuite/gcc.misc-tests/i386-pf-3dnow-1.c

   1 /* Test that the correct data prefetch instructions are generated for i386
   2    variants that use 3DNow! prefetch instructions.  */
   3
   4 /* { dg-do compile { target i?86-*-* } } */
   5 /* { dg-skip-if "" { i?86-*-* } { "-m64" } { "" } } */
   6
   7 extern void exit (int);
   8
   9 char *msg = "howdy there";
  10
  11 void foo (char *p)
  12 {
  13   __builtin_prefetch (p, 0, 0);
  14   __builtin_prefetch (p, 0, 1);
  15   __builtin_prefetch (p, 0, 2);
  16   __builtin_prefetch (p, 0, 3);
  17   __builtin_prefetch (p, 1, 0);
  18   __builtin_prefetch (p, 1, 1);
  19   __builtin_prefetch (p, 1, 2);
  20   __builtin_prefetch (p, 1, 3);
  21 }
  22
  23 int main ()
  24 {
  25   foo (msg);
  26   exit (0);
  27 }
  28
  29 /* { dg-final { scan-assembler "prefetch" } } */
  30 /* { dg-final { scan-assembler "prefetchw" } } */
  31 /* { dg-final { scan-assembler-not "prefetchnta" } } */
  32 /* { dg-final { scan-assembler-not "prefetcht" } } */