gcc/testsuite/gcc.target/i386/pr103205-2.c

/* { dg-do compile } */
/* { dg-options "-O2 -mtune-ctrl=^himode_math" } */

extern short foo;
extern unsigned short bar;

int
foo1 (void)
{
  return __sync_fetch_and_and (&foo, ~1) & 1;
}

int
foo2 (void)
{
  return __sync_fetch_and_or (&foo, 1) & 1;
}

int
foo3 (void)
{
  return __sync_fetch_and_xor (&foo, 1) & 1;
}

unsigned short
bar1 (void)
{
  return __sync_fetch_and_and (&bar, ~1) & 1;
}

unsigned short
bar2 (void)
{
  return __sync_fetch_and_or (&bar, 1) & 1;
}

unsigned short
bar3 (void)
{
  return __sync_fetch_and_xor (&bar, 1) & 1;
}

/* { dg-final { scan-assembler-times "lock;?\[ \t\]*btrw" 2 } } */
/* { dg-final { scan-assembler-times "lock;?\[ \t\]*btsw" 2 } } */
/* { dg-final { scan-assembler-times "lock;?\[ \t\]*btcw" 2 } } */
/* { dg-final { scan-assembler-not "cmpxchgw" } } */