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Re: Enable pointer TBAA for LTO

From: Bernd Schmidt <bschmidt at redhat dot com>
To: Richard Biener <rguenther at suse dot de>, Jan Hubicka <hubicka at ucw dot cz>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 11 Nov 2015 13:43:19 +0100
Subject: Re: Enable pointer TBAA for LTO
Authentication-results: sourceware.org; auth=none
References: <20151108204618 dot GA68715 at kam dot mff dot cuni dot cz> <alpine dot LSU dot 2 dot 11 dot 1511101306050 dot 10078 at zhemvz dot fhfr dot qr> <20151110181515 dot GB78110 at kam dot mff dot cuni dot cz> <alpine dot LSU dot 2 dot 11 dot 1511111019350 dot 7543 at zhemvz dot fhfr dot qr>

On 11/11/2015 10:21 AM, Richard Biener wrote:

On Tue, 10 Nov 2015, Jan Hubicka wrote:

The reason is that TYPE_CANONICAL is initialized in get_alias_set that may be
called before we finish all merging and then it is more fine grained than what
we need here (i.e. TYPE_CANONICAL of pointers to two differnt types will be
different, but here we want them to be equal so we can match:

struct aa { void *ptr;};
struct bb { int * ptr;};

Which is actually required for Fortran interoperability.


Just curious, is this sort of thing documented anywhere?


Bernd

Follow-Ups:
- Re: Enable pointer TBAA for LTO
  - From: Jan Hubicka

References:
- Enable pointer TBAA for LTO
  - From: Jan Hubicka
- Re: Enable pointer TBAA for LTO
  - From: Richard Biener
- Re: Enable pointer TBAA for LTO
  - From: Jan Hubicka
- Re: Enable pointer TBAA for LTO
  - From: Richard Biener

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