//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()

TEXT ·Cas64(SB),NOSPLIT,$-4-21
	NO_LOCAL_POINTERS
	MOVW	addr+0(FP), R1
	CHECK_ALIGN

#ifndef GOARM_7
	MOVB	internal∕cpu·ARM+const_offsetARMHasV7Atomics(SB), R11
	CMP	$1, R11
	BEQ	2(PC)
	JMP	·goCas64(SB)
#endif
	JMP	armCas64<>(SB)

TEXT ·Xadd64(SB),NOSPLIT,$-4-20
	NO_LOCAL_POINTERS
	MOVW	addr+0(FP), R1
	CHECK_ALIGN

#ifndef GOARM_7
	MOVB	internal∕cpu·ARM+const_offsetARMHasV7Atomics(SB), R11