http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50176
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at redhat dot com
--- Comment #20 from Jeffrey A. Law <law at redhat dot com> 2013-01-15 21:28:30
UTC ---
Jakub,
As far as I can tell, this is still a problem with the trunk; Uros's changes to
i386.md do not help with this problem.
I updated just the fwprop portion of your patch to work with the trunk and as
far as I can tell it resolves the problem completely, resulting in a loop which
is effectively the same as gcc-4.6.
The patch doesn't look terribly complex -- enough that I think we could
consider it in stage3 as it does fix a clear performance regression.
My suggestion would be to submit this for 4.8; if you don't want to do that,
then let's downgrade to a P4 and attach it to 4.9 pending patches tracker
(BZ55996) that we should consider once 4.9 opens.
