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Re: Speedup CSE by 5%

From: Kazu Hirata <kazu at cs dot umass dot edu>
To: law at redhat dot com
Cc: arend dot bayer at web dot de, richard dot guenther at gmail dot com, gcc-patches at gcc dot gnu dot org
Date: Wed, 26 Jan 2005 09:04:36 -0500 (EST)
Subject: Re: Speedup CSE by 5%
References: <1106701189.5060.2.camel@localhost.localdomain><20050125.210316.59652967.kazu@cs.umass.edu><1106709486.5060.5.camel@localhost.localdomain>

Hi Jeff,

> I understand all that.  However, if you look at the first call to
> validate_change (inside an ASM_OPERANDS case) you'll see a case where
> I think we can modify x without copying it first.

Ah huh.  Can we somehow fix that place?  One-percent improvement in
compile time is hard to let go.  Plus, a little bit of overhead may be
tolerable for ASM_OPERANDS, assuming ASM_OPERANDS make up a small
portion of most source code.

Kazu Hirata

References:
- Re: Speedup CSE by 5%
  - From: Jeffrey A Law
- Re: Speedup CSE by 5%
  - From: Kazu Hirata
- Re: Speedup CSE by 5%
  - From: Jeffrey A Law

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