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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 ·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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