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[Bug target/27855] reassociation pass produces ~30% slower matrix multiplication code
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Jun 2006 02:11:22 -0000
- Subject: [Bug target/27855] reassociation pass produces ~30% slower matrix multiplication code
- References: <bug-27855-1649@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from dberlin at gcc dot gnu dot org 2006-06-03 02:11 -------
Subject: Re: reassociation pass produces ~30% slower matrix
multiplication code
steven at gcc dot gnu dot org wrote:
> ------- Comment #4 from steven at gcc dot gnu dot org 2006-06-02 23:19 -------
> Real bug, despite Andrew's usual portion of x86-hate.
>
>
It'd be good to know what exactly is going wrong.
Reassociation only touches floating point because someone asked me to
make it touch floating point.
It still shouldn't have *this* much of an affect, my guess is it is
triggering some bad behavior elsewhere.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27855