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	TEXT	memchr(SB),$0
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	MOVL	n+8(FP), CX
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	CMPL	CX, $0
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	JEQ	none
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	MOVL	p+0(FP), DI
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	MOVBLZX	c+4(FP), AX
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	CLD
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/*
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 * SCASB is memchr instruction
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 */
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	REPN;	SCASB
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	JEQ	found
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none:
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	MOVL	$0, AX
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	RET
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found:
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	MOVL	DI, AX
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	SUBL	$1, AX
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	RET