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[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: 8 May 2009 09:41:21 -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 #82 from bonzini at gnu dot org 2009-05-08 09:41 -------
Hm, looking at the time reports the patch will save about 30-40% of the fwprop
execution time, and should fix the memory hog problem, but will still leave in
the 70s needed to compute reaching definitions. I guess it's a step forward
for -O2 but borderline for -O1.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928