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From: Rich Felker <dalias@aerifal.cx>
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Subject: Re: Re: musl libc, memcpy
Date: Wed, 1 Aug 2012 01:40:11 -0400
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On Wed, Aug 01, 2012 at 12:27:22AM -0400, Rich Felker wrote:
> I'm attaching a (possibly buggy; not heavily tested) rep-movsd-based
> version. I'd be interested in hearing how it performs.

And here is the attachment...

Rich

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Content-Disposition: attachment; filename="memcpy.s"

.global xmemcpy
.type xmemcpy,@function
xmemcpy:
	push %esi
	push %edi
	mov 12(%esp),%edi
	mov 16(%esp),%esi
	mov 20(%esp),%ecx
	mov %edi,%eax
	mov %ecx,%edx
	shr $2,%ecx
	rep
	movsl
	and $3,%edx
	jz 1f
2:	mov (%esi),%cl
	mov %cl,(%edi)
	inc %esi
	inc %edi
	dec %edx
	jnz 2b
1:	pop %edi
	pop %esi
	ret

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