func atomic_storePointer(ptr *unsafe.Pointer, new unsafe.Pointer) {
	atomicstorep(unsafe.Pointer(ptr), new)
}

// atomic_casPointer is the implementation of runtime/internal/UnsafePointer.CompareAndSwap
// (like CompareAndSwapNoWB but with the write barrier).
//
//go:nosplit
//go:linkname atomic_casPointer internal/runtime/atomic.casPointer
func atomic_casPointer(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool {
	if writeBarrier.enabled {

			// much activity, or the map gets big and races to insert on
			// the same node are much less likely.
			if newNode == nil {
				newNode = tab.newTraceMapNode(data, size, hash, tab.seq.Add(1))
			}
			if m.CompareAndSwapNoWB(nil, unsafe.Pointer(newNode)) {
				return newNode.id, true
			}
			// Reload n. Because pointers are only stored once,
			// we must have lost the race, and therefore n is not nil
			// anymore.