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Re: [PATCH] Fix optimization regression in constant folder

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: richard dot guenther at gmail dot com
Cc: ebotcazou at adacore dot com, gcc-patches at gcc dot gnu dot org, iant at google dot com, mark at codesourcery dot com, matz at suse dot de
Date: Mon, 15 Oct 2007 09:30:07 EDT
Subject: Re: [PATCH] Fix optimization regression in constant folder
References: <200709171539.26653.ebotcazou@adacore.com> <10710120240.AA03734@vlsi1.ultra.nyu.edu> <m3wsttymh6.fsf@localhost.localdomain> <200710141225.08559.ebotcazou@adacore.com> <84fc9c000710140331t5b1bf94cr3a19b395c19faa22@mail.gmail.com> <10710141128.AA13909@vlsi1.ultra.nyu.edu> <84fc9c000710140608r6e86aa58wdacfb9e91cbbb3b8@mail.gmail.com> <10710150007.AA21358@vlsi1.ultra.nyu.edu> <Pine.LNX.4.64.0710150735030.23011@wotan.suse.de> <10710151056.AA28470@vlsi1.ultra.nyu.edu> <84fc9c000710150617t27aaa9ecj7037b386ca1c61f1@mail.gmail.com>

> Let's say it this way - every simplification to the middle-end helps avoiding
> (and fixing) obscure bugs in fold-const.  

But a sizetype is what it is.  Nothing we do is going to change that.
All we can talk about doing is chosing to ignore certain properties of it
(such as that some optimizations on it are safe).  But in that case,
we should do it by ignoring the flag for those optimizations, not in 
any other way.

References:
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Kenner
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Ian Lance Taylor
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Eric Botcazou
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Guenther
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Kenner
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Guenther
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Kenner
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Michael Matz
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Kenner
- Re: [PATCH] Fix optimization regression in constant folder
  - From: Richard Guenther

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