// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// func cas(val *int32, old, new int32) bool
// Atomically:
//	if *val == old {
//		*val = new;
//		return true;
//	}else
//		return false;

TEXT	sync·cas+0(SB),0,$12
	TODO