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Re: PR 6212

From: Richard Henderson <rth at redhat dot com>
To: Mark Mitchell <mark at codesourcery dot com>
Cc: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Sun, 5 May 2002 23:26:16 -0700
Subject: Re: PR 6212
References: <10205060303.AA17372@vlsi1.ultra.nyu.edu> <28230000.1020663794@warlock.codesourcery.com>

On Sun, May 05, 2002 at 10:43:15PM -0700, Mark Mitchell wrote:
> If the pointer value is merely being read, the assumption does not hold,
> 
> For example, we must not optimize:
> 
>   (int)(T*)x % alignof(T)
> 
> to 0.

Correct, and there is in fact a test for this in the suite.

The point at which we need to be presuming alignment is the
point at which we actually create a MEM.

r~

References:
- Re: PR 6212
  - From: Richard Kenner
- Re: PR 6212
  - From: Mark Mitchell

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