[Bug target/27855] reassociation pass produces ~30% slower matrix multiplication code

[dberlin at dberlin 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.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27855