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Re: [RFH] Folding of &a[-1]

From: Richard Guenther <richard dot guenther at gmail dot com>
To: Andrew Pinski <pinskia at physics dot uc dot edu>
Cc: Theodore dot Papadopoulo at sophia dot inria dot fr, gcc at gcc dot gnu dot org, Paul Schlie <schlie at comcast dot net>, Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
Date: Thu, 17 Feb 2005 10:46:36 +0100
Subject: Re: [RFH] Folding of &a[-1]
References: <Pine.LNX.4.44.0502161401350.2297-100000@alwazn.tat.physik.uni-tuebingen.de> <1108568974.7217.37.camel@localhost> <4d2bfe31426713cea6704e2b1a11d7eb@physics.uc.edu>
Reply-to: Richard Guenther <richard dot guenther at gmail dot com>

On Wed, 16 Feb 2005 10:51:58 -0500, Andrew Pinski
<pinskia@physics.uc.edu> wrote:
> 
> On Feb 16, 2005, at 10:49 AM, Theodore Papadopoulo wrote:
> 
> > Then, I must add that I do not know much about the compiler's
> > internals...
> 
> If a[-1] os converted to a[(unsigned)-1], this is fine iff unsigned is
> the same size as pointers.

Ok, as the conversion is done to (int *) which is unsigned and of
course of size of pointers
it came to my mind that just casting back that one to signed for the
index arithmetic should work.
I'll try that.

Thanks for all the suggestions,
Richard.

Follow-Ups:
- TYPE_MIN_VALUE and pointer types
  - From: Paul Schlie

References:
- Re: [RFH] Folding of &a[-1]
  - From: Richard Guenther
- Re: [RFH] Folding of &a[-1]
  - From: Theodore Papadopoulo
- Re: [RFH] Folding of &a[-1]
  - From: Andrew Pinski

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