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Re: [Bug tree-optimization/33562] [4.3 Regression] aggregate DSE disabled
- From: "Andrew Pinski" <pinskia at gmail dot com>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 27 Sep 2007 02:19:07 -0700
- Subject: Re: [Bug tree-optimization/33562] [4.3 Regression] aggregate DSE disabled
- References: <bug-33562-10053@http.gcc.gnu.org/bugzilla/> <20070927090817.19188.qmail@sourceware.org>
On 27 Sep 2007 09:08:17 -0000, rguenther at suse dot de
<gcc-bugzilla@gcc.gnu.org> wrote:
> I did wonder what optimized that before... (maybe a separate bug for
> this is more appropriate)
Must_def cause the optimization to work IIRC. In fact this is the
reason why aggregate DSE was added was specifically to fix this
testcase.
See http://gcc.gnu.org/ml/gcc-patches/2006-05/msg01115.html which
specifically mentions this. I am still trying to understand why we
removed must_def anyways. Everything points to the removal of
must_def caused many different regressions.
Thanks,
Andrew Pinski