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Re: combine/dce patch for PR36003, PR42575

From: Paolo Bonzini <bonzini at gnu dot org>
To: Eric Botcazou <ebotcazou at adacore dot com>
Cc: Bernd Schmidt <bernds at codesourcery dot com>, gcc-patches at gcc dot gnu dot org
Date: Mon, 28 Jun 2010 11:54:19 +0200
Subject: Re: combine/dce patch for PR36003, PR42575
References: <4C20938E.2060606@codesourcery.com> <201006272305.05010.ebotcazou@adacore.com> <4C286FAB.8000105@gnu.org> <201006281147.39299.ebotcazou@adacore.com>

On 06/28/2010 11:47 AM, Eric Botcazou wrote:

single_set would be a better match, no?
What do you mean exactly? That single_set returns NULL_RTX for PARALLEL?

That it doesn't return NULL_RTX for CLOBBERs, USEs, or SETs whose output will not be used (like, most of the time, the CC set).

Paolo

Follow-Ups:
- Re: combine/dce patch for PR36003, PR42575
  - From: Eric Botcazou

References:
- combine/dce patch for PR36003, PR42575
  - From: Bernd Schmidt
- Re: combine/dce patch for PR36003, PR42575
  - From: Eric Botcazou
- Re: combine/dce patch for PR36003, PR42575
  - From: Paolo Bonzini
- Re: combine/dce patch for PR36003, PR42575
  - From: Eric Botcazou

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