------- Comment #75 from lucier at math dot purdue dot edu 2009-05-07 16:31 ------- Subject: Re: [4.3/4.4/4.5 Regression] 30% performance slowdown in floating-point code caused by r118475
On May 7, 2009, at 12:21 PM, bonzini at gnu dot org wrote: > ------- Comment #74 from bonzini at gnu dot org 2009-05-07 16:21 > ------- > Ok. One step at a time. :-) To recap, here is the situation: > > - that scheduling is necessary now and not in 4.2.x, probably is > just a matter > of luck If you mean -fschedule-insns2, it has always been part of the options list. > - at least we have a set of options providing good performance on this > testcase, and guidance towards better tuning of the various > problematic > optimizations OK, but -fforward-propagate is not viable in general for these machine-generated codes. > Brad -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928
