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Re: ARM/getting rid of superfluous zero extension

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Christophe Lyon <christophe dot lyon at linaro dot org>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 04 Oct 2012 20:18:49 +0200
Subject: Re: ARM/getting rid of superfluous zero extension
References: <CAKdteOYsatVOOK3K9kSgnghgbhH1Hzyw8rc6B+7=Yr4Z3Y8h+Q@mail.gmail.com>

> Any suggestion about how I could avoid generating this zero_extension?

Redundant extensions have been a hot topic for some time.  The combiner should 
catch the local easy cases, we have ree.c for the nonlocal easy cases and Tom 
recently posted:
  http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00408.html
which should catch more complex cases.

I guess someone should gather the various missed optimization cases, draw a 
global picture of the situation and see how the various approaches could be 
fitted together.

-- 
Eric Botcazou

Follow-Ups:
- Re: ARM/getting rid of superfluous zero extension
  - From: David Edelsohn

References:
- ARM/getting rid of superfluous zero extension
  - From: Christophe Lyon

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