------- Comment #48 from bonzini at gnu dot org 2009-02-13 20:09 -------
Subject: Re: [4.3/4.4 Regression] 30%
performance slowdown in floating-point code caused by r118475
> Yes. I don't see why the optimizations in CSE, which were relatively
> cheap and which were effective for this case, needed to be disabled when
> FWPROP was added without, evidently, understanding why FWPROP does not
> do what CSE was already doing.
Just to mention it, fwprop saved 3% of compile time. That's not
"cheap". It was also tested with SPEC and Nullstone on several
architectures.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928
