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Re: combine/dce patch for PR36003, PR42575

From: Bernd Schmidt <bernds at codesourcery dot com>
To: Eric Botcazou <ebotcazou at adacore dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Thu, 24 Jun 2010 01:48:13 +0200
Subject: Re: combine/dce patch for PR36003, PR42575
References: <4C20938E.2060606@codesourcery.com> <201006231241.25193.ebotcazou@adacore.com>

On 06/23/2010 12:41 PM, Eric Botcazou wrote:

> Reenabling pass_fast_rtl_byte_dce cannot be done without first evaluating the 
> speed/performance trade-off, DF is known to be costly.

It also seems to create some regressions on arm-linux.

Would you be opposed to adding a simpler, basic-block-local pass that
only tries to eliminate unnecessary operations on DImode subregs?

Bernd

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

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

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