}

//go:linkname sync_atomic_SwapUintptr sync/atomic.SwapUintptr
func sync_atomic_SwapUintptr(ptr *uintptr, new uintptr) uintptr

//go:linkname sync_atomic_SwapPointer sync/atomic.SwapPointer
//go:nosplit
func sync_atomic_SwapPointer(ptr *unsafe.Pointer, new unsafe.Pointer) unsafe.Pointer {
	if writeBarrier.enabled {
		atomicwb(ptr, new)
	}
	if goexperiment.CgoCheck2 {
		cgoCheckPtrWrite(ptr, new)

// Consider using the more ergonomic and less error-prone [Uintptr.Swap] instead.
func SwapUintptr(addr *uintptr, new uintptr) (old uintptr)

// SwapPointer atomically stores new into *addr and returns the previous *addr value.
// Consider using the more ergonomic and less error-prone [Pointer.Swap] instead.
func SwapPointer(addr *unsafe.Pointer, new unsafe.Pointer) (old unsafe.Pointer)

// CompareAndSwapInt32 executes the compare-and-swap operation for an int32 value.

func (x *Pointer[T]) Store(val *T) { StorePointer(&x.v, unsafe.Pointer(val)) }

// Swap atomically stores new into x and returns the previous value.
func (x *Pointer[T]) Swap(new *T) (old *T) { return (*T)(SwapPointer(&x.v, unsafe.Pointer(new))) }

// CompareAndSwap executes the compare-and-swap operation for x.
func (x *Pointer[T]) CompareAndSwap(old, new *T) (swapped bool) {

		after  uintptr
	}
	var m uint64 = magic64
	magicptr := uintptr(m)
	x.before = magicptr
	x.after = magicptr
	var j unsafe.Pointer

	for _, p := range testPointers() {
		k := SwapPointer(&x.i, p)
		if x.i != p || k != j {
			t.Fatalf("p=%p i=%p j=%p k=%p", p, x.i, j, k)
		}
		j = p
	}
	if x.before != magicptr || x.after != magicptr {