linux下编程用
编译软件
源代码在线查看： i386-pf-athlon-1.c
/* Test that the correct data prefetch instructions are generated for i386 variants that use 3DNow! prefetchw or SSE prefetch instructions with locality hints. */ /* { 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 "prefetchw" } } */ /* { dg-final { scan-assembler "prefetchnta" } } */ /* { dg-final { scan-assembler "prefetcht" } } */
