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

TEXT bytes·IndexByte(SB),7,$0
	MOVL	p+0(FP), SI
	MOVL	len+4(FP), CX
	MOVB	b+12(FP), AL
	MOVL	SI, DI
	CLD; REPN; SCASB
	JZ 3(PC)
	MOVL	$-1, ret+16(FP)
	RET
	SUBL	SI, DI
	SUBL	$1, DI
	MOVL	DI, ret+16(FP)
	RET

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