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Re: [PATCH] Fix another bad alias warning for ref-all pointers

From: Jonathan Lennox <lennox at cs dot columbia dot edu>
To: "Andrew Pinski" <pinskia at gmail dot com>
Cc: "Richard Guenther" <rguenther at suse dot de>, gcc-patches at gcc dot gnu dot org
Date: Mon, 11 Aug 2008 11:20:47 -0400
Subject: Re: [PATCH] Fix another bad alias warning for ref-all pointers
References: <alpine.LNX.1.10.0808071156000.3427@zhemvz.fhfr.qr> <de8d50360808101214v15ff707bo73099473f2c3be7b@mail.gmail.com>

"Andrew Pinski" writes:
> On Thu, Aug 7, 2008 at 2:57 AM, Richard Guenther <rguenther@suse.de> wrote:
> > 2008-08-07  Richard Guenther  <rguenther@suse.de>
> >
> >        PR middle-end/37042
> >        * tree-ssa-alias-warnings.c (nonstandard_alias_p): Ref-all
> >        pointers can access anything.
> >
> >        * gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c: New testcase.

> This testcase fails on PPC64 Linux:
> /home/apinski/src/local/gcc/gcc/testsuite/gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c:8:
> warning: GCC vector returned by reference: non-standard ABI extension
> with no compatibility guarantee

I'm the original submitter of the PR.  The fact that the original function
returned the vector that was loaded was entirely incidental to the test; the
value just needs not to be optimized out as unused.  So as far as I'm
concerned, feel free to change it as needed.

-- 
Jonathan Lennox
lennox at cs dot columbia dot edu

References:
- [PATCH] Fix another bad alias warning for ref-all pointers
  - From: Richard Guenther
- Re: [PATCH] Fix another bad alias warning for ref-all pointers
  - From: Andrew Pinski

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