ObjFW  Diff

#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int32_t r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "jne	0\n\t"
	    "incl	%0\n"
	    "sete	%b0\n\t"
	    "movzbl	%b0, %0"
	    "0:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);

#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "jne	0\n\t"
	    "incl	%0\n"
	    "sete	%b0\n\t"
	    "movzbl	%b0, %0"
	    "0:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);

#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "jne	0\n\t"
	    "incl	%0\n"
	    "sete	%b0\n\t"
	    "movzbl	%b0, %0"
	    "0:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_OSATOMIC)
	return OSAtomicCompareAndSwapPtrBarrier(o, n, p);
#endif
}