This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/24123] [4.1 Regression] Massive performance regression for -ffast-math due to the recip tree pass
- From: "bonzini at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Sep 2005 08:22:11 -0000
- Subject: [Bug tree-optimization/24123] [4.1 Regression] Massive performance regression for -ffast-math due to the recip tree pass
- References: <20050929140549.24123.uros@kss-loka.si>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From bonzini at gcc dot gnu dot org 2005-09-30 08:22 -------
Uros, it seems from your comments that POVray is also 7.43% faster with the
rewritten recip pass, than without any recip pass:
time for no recip pass (comment #4): 1.43 * 100 / 10.05 = 14.22
time for new recip pass (comment #6): 1.85 * 100 / 12.04 = 15.36
Did you take the two times on the same machine, with the same scene, and with
similar load conditions?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24123