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Re: Incorrect bitfield aliasing with Tree SSA

From: "Daniel Berlin" <dberlin at dberlin dot org>
To: "Adam Nemet" <anemet at caviumnetworks dot com>
Cc: "Richard Kenner" <kenner at vlsi1 dot ultra dot nyu dot edu>, ebotcazou at libertysurf dot fr, gcc-patches at gcc dot gnu dot org
Date: Tue, 19 Jun 2007 09:08:47 -0400
Subject: Re: Incorrect bitfield aliasing with Tree SSA
References: <18034.48960.772642.116034@localhost.localdomain> <4aca3dc20706180923w7aacaf70nca02f1b1889fee2d@mail.gmail.com> <10706181840.AA18911@vlsi1.ultra.nyu.edu> <18038.53973.176888.769019@localhost.localdomain> <10706181919.AA20122@vlsi1.ultra.nyu.edu> <18038.56438.326248.309718@localhost.localdomain> <10706181934.AA20586@vlsi1.ultra.nyu.edu> <18038.60958.848619.101615@localhost.localdomain> <10706182056.AA22289@vlsi1.ultra.nyu.edu> <18039.29800.223240.870336@localhost.localdomain>

On 6/19/07, Adam Nemet <anemet@caviumnetworks.com> wrote:

Richard Kenner writes:
> I continue to strongly feel that the field type shouldn't be used
> for ANYTHING!

I still think there is value in a separate alias set but in the hope
that this thread will end soon, here is a patch to special-case
non-addressable fields in the SFT code.  I will test this overnight
but it fixes my issue with bitfields and preserves the RTL
optimization on Eric's Ada testcase.

This is fine, thanks for doing it.

At some point i'll change it to use a separate alias set, but i have
other bugs to fix right now

References:
- Re: Incorrect bitfield aliasing with Tree SSA
  - From: Adam Nemet

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