------- Comment #5 from dberlin at gcc dot gnu dot org 2007-10-01 21:07 ------- Subject: Re: [4.3 Regression] Revision 119502 causes significantly slower results with 4.3 compared to 4.2
I'm not fixing this until someone can tell me what exactly is going wrong. There have been *so* many changes to PTA since that revision that the majority of the code it touched doesn't even do the same thing anymore. My guess is that this is a case where adding extra vdefs/vuses made some dumb optimizer able to see something it can't when the chains are separate like they should be. On 1 Oct 2007 21:04:40 -0000, hjl at lucon dot org <[EMAIL PROTECTED]> wrote: > > > ------- Comment #4 from hjl at lucon dot org 2007-10-01 21:04 ------- > I saw 40% performance regression at -O3 with testcase in comment #1 on > Linux/x86-64. > > > -- > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604 > > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604
