gcc/testsuite/gcc.target/powerpc/ppc-mftb.c

   1 /* { dg-do run { target { powerpc*-*-* } } } */
   2
   3 /* Test if __builtin_ppc_mftb () is compatible with the current processor and
   4    if it's changing between reads.  A read failure might indicate a Power
   5    ISA or binutils change.  */
   6
   7 int
   8 main (void)
   9 {
  10   unsigned long t = __builtin_ppc_mftb ();
  11   int j;
  12
  13   for (j = 0; j < 1000000; j++)
  14     if (t != __builtin_ppc_mftb ())
  15       return 0;
  16
  17   return 1;
  18 }