This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug rtl-optimization/33928] [4.3/4.4/4.5 Regression] 30% performance slowdown in floating-point code caused by r118475
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Jun 2009 16:22:23 -0000
- Subject: [Bug rtl-optimization/33928] [4.3/4.4/4.5 Regression] 30% performance slowdown in floating-point code caused by r118475
- References: <bug-33928-271@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #100 from bonzini at gnu dot org 2009-06-15 16:22 -------
Just as a reminder for after the fwprop patches are committed, the problem in
CFG cleanup is that the iterative fixing of dominators in
remove_edge_and_dominated_blocks is very expensive. Probably we should make
sure no dominators are there in some key cfgcleanup passes.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928