blob: 07389dd3b5962e2e9316706c801955bda771b804 [file] [log] [blame]
// 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┬Ěcas(SB), 7, $0
MOVQ 8(SP), BX
MOVL 16(SP), AX
MOVL 20(SP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ ok
MOVL $0, 24(SP)
RET
ok:
MOVL $1, 24(SP)
RET