gcc/testsuite/gcc.target/ia64/sync-1.c

/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-final { scan-assembler "xchg4 .*, r0" } } */
/* { dg-final { scan-assembler "cmpxchg4.*, r0, .*" } } */
/* { dg-final { scan-assembler "cmpxchg8.*, r0, .*" { target lp64 } } } */

int
foo1 (int *p)
{
  return __sync_lock_test_and_set (p, 0);
}

int
foo2 (int *p, int v)
{
  return __sync_bool_compare_and_swap (p, v, 0);
}

long
foo3 (long *p, long v)
{
  return __sync_bool_compare_and_swap (p, v, 0);
}