?? i386-pf-none-1.c
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/* Test that data prefetch instructions are not generated for i386 variants that do not support those instructions. *//* { dg-do compile { target i?86-*-* x86_64-*-* } } *//* { dg-require-effective-target ilp32 } */extern void exit (int);char *msg = "howdy there";void foo (char *p){ __builtin_prefetch (p, 0, 0); __builtin_prefetch (p, 0, 1); __builtin_prefetch (p, 0, 2); __builtin_prefetch (p, 0, 3); __builtin_prefetch (p, 1, 0); __builtin_prefetch (p, 1, 1); __builtin_prefetch (p, 1, 2); __builtin_prefetch (p, 1, 3);}int main (){ foo (msg); exit (0);}/* { dg-final { scan-assembler-not "fetch" } } */?? 快捷鍵說(shuō)明
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