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Re: [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it

From: Eric Botcazou <ebotcazou at adacore dot com>
To: "Richard Guenther" <richard dot guenther at gmail dot com>
Cc: "Richard Guenther" <rguenther at suse dot de>, gcc-patches at gcc dot gnu dot org
Date: Thu, 6 Dec 2007 15:49:41 +0100
Subject: Re: [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it
References: <Pine.LNX.4.64.0712061448250.11439@zhemvz.fhfr.qr> <200712061511.43114.ebotcazou@adacore.com> <84fc9c000712060635l6e5961d1gcd2f10b579af4dcc@mail.gmail.com>

> the two references i[0] and i[1] have !refs_must_alias_p relationship,
> while alias_sets_must_conflict_p returns true here.  One could use
> alias_sets_must_conflict_p as "early out" if that returns false, but
> otherwise I don't see how this helps here.

Yes, that's what I was thinking of, like in refs_may_alias_p.

Btw, I don't think you need to test flag_strict_aliasing there.

-- 
Eric Botcazou

Follow-Ups:
- Re: [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it
  - From: Richard Guenther

References:
- [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it
  - From: Richard Guenther
- Re: [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it
  - From: Eric Botcazou
- Re: [PATCH][RFC][4.4] Add may-alias oracle, make SCCVN use it
  - From: Richard Guenther

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