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Re: [PATCH] Minor performance improvement for AMD64 assembly routines

From: Ulrich Drepper <drepper at redhat dot com>
To: Nicholas Miell <nmiell at comcast dot net>
Cc: libc-alpha at sources dot redhat dot com
Date: Mon, 06 Dec 2004 16:31:34 -0800
Subject: Re: [PATCH] Minor performance improvement for AMD64 assembly routines
Organization: Red Hat, Inc.
References: <1102308991.3585.9.camel@localhost.localdomain> <41B4E032.2010908@redhat.com> <1102376180.3582.13.camel@localhost.localdomain>

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Nicholas Miell wrote:

> The Intel optimization manual does say to avoid using prefixes where
> possible in order to increase decoder throughput. When tuning for
> nocona, gcc doesn't generate the prefixes.

Exactly.  Which is why adding this patch to blended code is a bad idea.
 The prefix decoding in P4 cores is slow.

- --
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â
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References:
- [PATCH] Minor performance improvement for AMD64 assembly routines
  - From: Nicholas Miell
- Re: [PATCH] Minor performance improvement for AMD64 assembly routines
  - From: Ulrich Drepper
- Re: [PATCH] Minor performance improvement for AMD64 assemblyroutines
  - From: Nicholas Miell

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