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Re: PING fwprop and pr/19653

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Giovanni Bajo <rasky at develer dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Tue, 14 Mar 2006 08:37:34 +0100
Subject: Re: PING fwprop and pr/19653
References: <440E93D0.80208@lu.unisi.ch> <440F6373.7070201@t-online.de> <200603092042.11941.steven@gcc.gnu.org> <1142270291.2408.15.camel@localhost.localdomain> <571f6b510603131034g26ecbfbcm1cbb60511b57e197@mail.gmail.com> <1142288591.22105.3.camel@localhost.localdomain> <571f6b510603131439yb83b12asb5a921401b3afa80@mail.gmail.com> <1142294633.29190.4.camel@localhost.localdomain> <01df01c646fc$a4719d50$5f4b2597@bagio>

Giovanni Bajo wrote:

Jeffrey A Law <law@redhat.com> wrote:

I noticed the CSE finds optimization opportunties due to lowering of 64bit ops to 32bit ops on i686-pc-linux-gnu.
Would this help?
http://gcc.gnu.org/ml/gcc-patches/2005-05/msg00554.html

It sure does. With GCC changes I'm doing at work, I get two-fold speedups on ARM (those changes are quite longlong heavy, and the compilation is actually worse without subreg lowering).

Paolo

References:
- PING fwprop and pr/19653
  - From: Paolo Bonzini
- Re: PING fwprop and pr/19653
  - From: Bernd Schmidt
- Re: PING fwprop and pr/19653
  - From: Steven Bosscher
- Re: PING fwprop and pr/19653
  - From: Jeffrey A Law
- Re: PING fwprop and pr/19653
  - From: Steven Bosscher
- Re: PING fwprop and pr/19653
  - From: Jeffrey A Law
- Re: PING fwprop and pr/19653
  - From: Steven Bosscher
- Re: PING fwprop and pr/19653
  - From: Jeffrey A Law
- Re: PING fwprop and pr/19653
  - From: Giovanni Bajo

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