gcc/testsuite/gcc.target/i386/pr67995-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -march=haswell" } */
   3
   4 unsigned int
   5 __attribute__ ((target("arch=core2")))
   6 __x86_rdrand(void)
   7 {
   8   unsigned int retries = 100;
   9   unsigned int val;
  10
  11   while (__builtin_ia32_rdrand32_step(&val) == 0) /* { dg-error "needs isa option" } */
  12     if (--retries == 0)
  13       return 0;
  14
  15   return val;
  16 }