head	1.1;access;symbols;locks	dls:1.1; strict;comment	@# @;1.1date	97.09.21.19.27.40;	author dls;	state Dist;branches;next	;desc@@1.1log@pre-3e code@text@/* blkcopy.s - blkcopy *//*------------------------------------------------------------------------ * blkcopy - copy "count" bytes from "src" to "dst" *	blkcopy(dst, src, count) *------------------------------------------------------------------------ */	.globl	_blkcopy/* * NOTE: to handle overlapping buffers in the copy, blkcopy() copies  *	bytes back-to-front if src < dst, front-to-back otherwise */	.align	2_blkcopy:	pushl	%esi	pushl	%edi	movl	12(%esp),%edi	movl	16(%esp),%esi	movl	20(%esp),%ecx	cmpl	%edi,%esi	jle	L100	sarl	$2,%ecx			/* long word count	*/	cld	rep	movsl	movl	20(%esp),%ecx	andl	$3,%ecx			/* move residual bytes	*/	rep	movsb	popl 	%edi	popl	%esi	retL100:		/* backwards blkcopy */	decl	%ecx	addl	%ecx,%esi		/* set pointers to end	*/	addl	%ecx,%edi	incl	%ecx	std	andl	$3,%ecx			/* move residual bytes */	rep	movsb	subl	$3,%esi		/* convert to long word pointer	*/	subl	$3,%edi		/* convert to long word pointer	*/	movl	20(%esp),%ecx	sarl	$2,%ecx			/* long-word count	*/	rep	movsl	popl	%edi	popl	%esi	ret@