//go:noescape
func Store(addr *uint32, v uint32)

//go:noescape
func StoreRel(addr *uint32, v uint32)

//go:noescape
func StoreReluintptr(addr *uintptr, v uintptr)

//go:nosplit
func goCas64(addr *uint64, old, new uint64) bool {
	if uintptr(unsafe.Pointer(addr))&7 != 0 {
		*(*int)(nil) = 0 // crash on unaligned uint64
	}
	_ = *addr // if nil, fault before taking the lock
	var ok bool
	addrLock(addr).lock()