Plan 9 from Bell Labs’s /n/sources/contrib/ericvh/go-plan9/src/pkg/sync/asm_386.s

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
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// 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(SB), 7, $0
	MOVL	4(SP), BX
	MOVL	8(SP), AX
	MOVL	12(SP), CX
	LOCK
	CMPXCHGL	CX, 0(BX)
	JZ ok
	MOVL	$0, 16(SP)
	RET
ok:
	MOVL	$1, 16(SP)
	RET

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