1 /* Both these atomic operations should be optimized to an exchange operation.
2 Test that it at happens on x86 by making sure there are 2 xchg's and no
3 compare_exchange loop. */
4
5 /* { dg-require-effective-target sync_int_long } */
6 /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
7 /* { dg-final { scan-assembler-times "cmpxchg" 0 } } */
8 /* { dg-final { scan-assembler-times "xchg" 2 } } */
9
10 int x;
11
f()12 int f()
13 {
14 return __atomic_fetch_and (&x, 0, __ATOMIC_RELAXED);
15 }
16
g()17 int g()
18 {
19 return __atomic_fetch_or (&x, -1, __ATOMIC_RELAXED);
20 }
21