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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/libc/386/memcmp.s – Rev 2

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	TEXT	memcmp(SB),$0
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	MOVL	n+8(FP), BX
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	CMPL	BX, $0
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	JEQ	none
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	MOVL	p1+0(FP), DI
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	MOVL	p2+4(FP), SI
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	CLD
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/*
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 * first by longs
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 */
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	MOVL	BX, CX
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	SHRL	$2, CX
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	REP;	CMPSL
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	JNE	found
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/*
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 * then by bytes
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 */
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	ANDL	$3, BX
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	MOVL	BX, CX
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	REP;	CMPSB
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	JNE	found1
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none:
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	MOVL	$0, AX
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	RET
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/*
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 * if long found,
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 * back up and look by bytes
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 */
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found:
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	MOVL	$4, CX
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	SUBL	CX, DI
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	SUBL	CX, SI
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	REP;	CMPSB
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found1:
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	JLS	lt
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	MOVL	$-1, AX
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	RET
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lt:
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	MOVL	$1, AX
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	RET