gcc/testsuite/gcc.dg/guality/ctztest.c

   1 /* { dg-do run { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
   2 /* { dg-options "-g" } */
   3
   4 volatile int vv;
   5
   6 __attribute__((noinline, noclone)) long
   7 foo (long x)
   8 {
   9   long f = __builtin_ctzl (x);
  10   long g = f;
  11   asm volatile ("" : "+r" (f));
  12   vv++;         /* { dg-final { gdb-test 12 "g" "f" } } */
  13   return f;
  14 }
  15
  16 __attribute__((noinline, noclone)) long
  17 bar (long x)
  18 {
  19   long f = __builtin_ctzl (x);
  20   long g = f;
  21   asm volatile ("" : "+r" (f));
  22   vv++;         /* { dg-final { gdb-test 22 "g" "f" } } */
  23   return f;
  24 }
  25
  26 int
  27 main ()
  28 {
  29   long x = vv;
  30   foo (x + 0x1234560UL);
  31   bar (x + 0x7fff8000UL);
  32   return 0;
  33 }