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Re: Use of vector instructions in memmov/memset expanding

From: Andi Kleen <andi at firstfloor dot org>
To: Michael Zolotukhin <michael dot v dot zolotukhin at gmail dot com>
Cc: Andi Kleen <andi at firstfloor dot org>, Jan Hubicka <hubicka at ucw dot cz>, Jakub Jelinek <jakub at redhat dot com>, gcc-patches at gcc dot gnu dot org, Richard Guenther <richard dot guenther at gmail dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>, izamyatin at gmail dot com, areg dot melikadamyan at gmail dot com
Date: Wed, 28 Sep 2011 18:27:11 +0200
Subject: Re: Use of vector instructions in memmov/memset expanding
References: <CANtU07-eCpAZ=VgvkdBCORq8bR0UZCgryofBXU_4FcRDJ7hWoQ@mail.gmail.com> <CANtU079YjpFwdy1kXoebsLyKe08KTwjwXDGJ4kY+gEJcZUTdMg@mail.gmail.com> <CANtU078YRvnQm8PMQ1GSUxczfTzwup1NLFJXmTDJfGPqVx_Nqg@mail.gmail.com> <m2hb3wj3lw.fsf@firstfloor.org> <20110928115546.GL2687@tyan-ft48-01.lab.bos.redhat.com> <20110928123605.GA31565@atrey.karlin.mff.cuni.cz> <CANtU07-uLMVaP07DhO1cqdXwLfQs5nxxUYYv6ugVm4MegHuNkw@mail.gmail.com> <20110928125433.GB31565@atrey.karlin.mff.cuni.cz> <20110928145447.GG7761@one.firstfloor.org> <CANtU07_9uZNG8Od_KCCC+fQz+spKgCix+ew+G+ibaz-TUCdvvw@mail.gmail.com>

> There is no separate cost-table for Nehalem or SandyBridge - however,
> I tuned generic32 and generic64 tables, that should improve
> performance on modern processors. In old version REP-MOV was used - it

The recommended heuristics have changed in Nehalem and Sandy-Bridge
over earlier Intel CPUs.

-nAid
-- 
ak@linux.intel.com -- Speaking for myself only.

Follow-Ups:
- Re: Use of vector instructions in memmov/memset expanding
  - From: Andi Kleen

References:
- Re: Use of vector instructions in memmov/memset expanding
  - From: Michael Zolotukhin
- Re: Use of vector instructions in memmov/memset expanding
  - From: Michael Zolotukhin
- Re: Use of vector instructions in memmov/memset expanding
  - From: Andi Kleen
- Re: Use of vector instructions in memmov/memset expanding
  - From: Jakub Jelinek
- Re: Use of vector instructions in memmov/memset expanding
  - From: Jan Hubicka
- Re: Use of vector instructions in memmov/memset expanding
  - From: Michael Zolotukhin
- Re: Use of vector instructions in memmov/memset expanding
  - From: Jan Hubicka
- Re: Use of vector instructions in memmov/memset expanding
  - From: Andi Kleen
- Re: Use of vector instructions in memmov/memset expanding
  - From: Michael Zolotukhin

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