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diff --git a/src/pkg/bytes/asm_386.s b/src/pkg/bytes/asm_386.s
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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 ·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