gcc/testsuite/gcc.dg/pr54087.c

   1 /* PR54087.  Verify __atomic_sub (val) uses __atomic_add (-val) if there is no
   2              atomic_aub.  */
   3 /* { dg-require-effective-target sync_int_long } */
   4 /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
   5 /* { dg-final { scan-assembler-times "xadd" 2 } } */
   6
   7
   8 int a;
   9
  10 int f1(int p)
  11 {
  12   return __atomic_sub_fetch(&a, p, __ATOMIC_SEQ_CST) == 0;
  13 }
  14
  15 int f2(int p)
  16 {
  17   return __atomic_fetch_sub(&a, p, __ATOMIC_SEQ_CST) - p == 0;
  18 }