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

[pinskia at gcc dot gnu dot org]

------- Comment #14 from pinskia at gcc dot gnu dot org  2007-03-02 17:42 -------
> Please consider the fact that all benchmarks are using -ffast-math nowadays. ;)

Please also consider the fact that the register allocator has been broken since
20 years ago :) :) :) :).

And I repeat again, this has nothing to do with -ffast-math, see my comment #6
and #7 where I prove -ffast-math is not the issue and it is just the register
allocator going wrong.  If anyone disables reassociation at the tree level, I
am going to object loudly.


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