------- Comment #9 from pinskia at gmail dot com 2010-02-04 16:36 ------- Subject: Re: Optimization flag -O1 -fschedule-insns2 cause red zone to be used when there is none
Sent from my iPhone On Feb 4, 2010, at 2:48 AM, "rearnsha at gcc dot gnu dot org" <gcc-bugzi...@gcc.gnu.org > wrote: > > > ------- Comment #8 from rearnsha at gcc dot gnu dot org 2010-02-04 > 10:48 ------- > Created an attachment (id=19803) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19803&action=view) > --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19803&action=view) > Possible patch > > I've been testing the attached patch on ARM (well, thumb) where > there's a > similar issue. It's perhaps a bit more aggressive than it needs to > be, but it > should solve the problem generically rather than requiring each back- > end to > implement hacks for what is really a MI issue. > > Could someone test this on PPC? Well powerpc64 it is valid to move across the stack pointer if the stack is less than a specific size so this can cause regressions there. And will also cause a performance regressions on x86_64 also for the same reason. > > > -- > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30282 > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30282
