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Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)

From: Paolo Bonzini <bonzini at gnu dot org>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, Bernd Schmidt <bernds at codesourcery dot com>, gcc-patches at gcc dot gnu dot org
Date: Fri, 20 Aug 2010 20:00:33 +0200
Subject: Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
References: <20100819163330.GX702@tyan-ft48-01.lab.bos.redhat.com> <4C6E4F08.6070801@gnu.org> <20100820135046.GC702@tyan-ft48-01.lab.bos.redhat.com> <AANLkTinafTnj+zn-aNQMo+Dqkq5=Uc7LZndwk2s1zcB4@mail.gmail.com> <20100820172757.GF702@tyan-ft48-01.lab.bos.redhat.com>

On 08/20/2010 07:27 PM, Jakub Jelinek wrote:

Not sure what exactly is
pextrb ..., %ecx
insn doing to the upper 32 bits of %rcx, if it clears them

Probably yes like every other 32-bit writeback on x86_64.

Paolo

Follow-Ups:
- Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: Jakub Jelinek

References:
- [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: Jakub Jelinek
- Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: Paolo Bonzini
- Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: Jakub Jelinek
- Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: H.J. Lu
- Re: [PATCH] Optimize nested SIGN_EXTENDs/ZERO_EXTENDs (PR target/45336)
  - From: Jakub Jelinek

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