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Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv

From: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Christian BRUEL <christian dot bruel at st dot com>, Ian Lance Taylor <iant at google dot com>, gcc-patches at gcc dot gnu dot org
Date: Thu, 15 Feb 2007 16:41:09 +0100
Subject: Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
References: <45D42560.2010506@st.com> <20070215093343.GA19299@atrey.karlin.mff.cuni.cz> <45D43AB6.4020709@st.com> <20070215111752.GA17650@atrey.karlin.mff.cuni.cz> <45D45681.1070902@st.com> <84fc9c000702150458r68b7d33bka3b4bf15dfc7c67f@mail.gmail.com> <20070215130453.GA1624@atrey.karlin.mff.cuni.cz> <84fc9c000702150644w246d3fcdv9486e60886e5ae64@mail.gmail.com> <20070215150023.GA16758@atrey.karlin.mff.cuni.cz> <84fc9c000702150732x79a77479m6d2a03738f8832e@mail.gmail.com>

Hello,

> >I think this is what Christian claimed, that we handle only the
> >case x + cst cmp x?
> >
> >Btw. if you wonder why we do not fold the comparison in his testcase,
> >the reason is that the code in fold_binary does not handle the case
> >x cmp x + cst...
> 
> But that's not the canonical form...  this is transformed to x + cst cmp x 
> first
> and then folded.

no, it is not.

Zdenek

References:
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Christian BRUEL
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Zdenek Dvorak
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Christian BRUEL
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Zdenek Dvorak
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Christian BRUEL
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Richard Guenther
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Zdenek Dvorak
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Richard Guenther
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Zdenek Dvorak
- Re: [patch] (-fstrict-overflow) optimize counted loops on signed iv
  - From: Richard Guenther

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