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Date:	Mon, 09 Nov 2009 10:26:14 +0100
From:	Andi Kleen <>
To:	"H. Peter Anvin" <>
Cc:	"Ma, Ling" <>, Ingo Molnar <>,
	Thomas Gleixner <>,
	linux-kernel <>
Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.

"H. Peter Anvin" <> writes:
> My personal opinion is that if we can show no significant slowdown on
> P4, K8, P-M/Core 1, Core 2, and Nehalem then we can simply use this code

The issue is Core 2.

P4 uses a different path, and Core 1 doesn't use the 64bit code.

> unconditionally.  If one of them is radically worse than baseline, then
> we have to do something conditional, which is a lot more complicated.

I have an older patchkit which did this, and some more optimizations
to this code.

There was still one open issue, that is why I didn't post it. If there's
interest I can post it.

-- -- Speaking for myself only.
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