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 {
		atomicwb(ptr, new)

	newC := buildTypeAssertCache(oldC, t, tab)

	// Update cache. Use compare-and-swap so if multiple threads
	// are fighting to update the cache, at least one of their
	// updates will stick.
	atomic_casPointer((*unsafe.Pointer)(unsafe.Pointer(&s.Cache)), unsafe.Pointer(oldC), unsafe.Pointer(newC))

	return tab
}

func buildTypeAssertCache(oldC *abi.TypeAssertCache, typ *_type, tab *itab) *abi.TypeAssertCache {