------- Comment #5 from pinskia at gmail dot com 2008-09-01 20:41 ------- Subject: Re: -Os significantly faster than -O2 on test case
This is mostly because of extra register moves that IRA some times introduces. There is another bug about Inline-asm and the return register. Sent from my iPhone On Sep 1, 2008, at 7:36, "rguenth at gcc dot gnu dot org" <[EMAIL PROTECTED] > wrote: > > > ------- Comment #4 from rguenth at gcc dot gnu dot org 2008-09-01 > 14:36 ------- > Well, now -Os -funroll-all-loops doesn't do any unrolling anymore > while it did > before. With -O2 you get what you ask for - unrolled loops. > > -funroll-all-loops isn't really a flag to be used in general. > > > -- > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37312 > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37312
