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From: "Bingfeng Mei" <bmei@broadcom.com>
To: "Ulrich Weigand" <uweigand@de.ibm.com>
cc: "gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
Date: Mon, 19 Sep 2011 11:58:00 -0000
Subject: RE: Derive more alias information from named address space
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References: <7FB04A5C213E9943A72EE127DB74F0ADD15FCB0108@SJEXCHCCR02.corp.ad.broadcom.com> from "Bingfeng Mei" at Sep 16, 2011 09:11:00 AM <201109191155.p8JBtdw1002580@d06av02.portsmouth.uk.ibm.com>
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Thanks. I will prepare a patch.

Bingfeng

> -----Original Message-----
> From: Ulrich Weigand [mailto:uweigand@de.ibm.com]
> Sent: 19 September 2011 12:56
> To: Bingfeng Mei
> Cc: gcc@gcc.gnu.org
> Subject: Re: Derive more alias information from named address space
>=20
> Bingfeng Mei wrote:
>=20
> > Therefore, A & B could only be disjoint, i.e., not aliased to each
> other.
> > We should be able to write:
> >
> >   if (MEM_ADDR_SPACE (mem) !=3D MEM_ADDR_SPACE (x))
> >   {
> >     if (!targetm.addr_space.subset_p (MEM_ADDR_SPACE (mem),
> MEM_ADDR_SPACE (x))
> >        && !targetm.addr_space.subset_p (MEM_ADDR_SPACE (x),
> MEM_ADDR_SPACE (mem)))
> >       return 0;
> >     else
> >       return 1;
> >   }
> >
> > Is this correct?
>=20
> Yes, this looks correct to me ...
>=20
> Bye,
> Ulrich
>=20
> --
>   Dr. Ulrich Weigand
>   GNU Toolchain for Linux on System z and Cell BE
>   Ulrich.Weigand@de.ibm.com