return Casint64(&i.value, old, new)
}

// Swap replaces i's value with new, returning
// i's value before the replacement.
//
//go:nosplit
func (i *Int64) Swap(new int64) int64 {
	return Xchgint64(&i.value, new)
}

// Add adds delta to i atomically, returning
// the new updated value.
//
// This operation wraps around in the usual
// two's-complement way.
//
//go:nosplit