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[Bug target/49485] Performance problem with C++ code
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 20 Oct 2011 07:36:40 +0000
- Subject: [Bug target/49485] Performance problem with C++ code
- Auto-submitted: auto-generated
- References: <bug-49485-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49485
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-20 07:36:40 UTC ---
For me the trunk with vectorization is certainly faster than 4.3, it is true
that 4.6 is slower.
4.3 -O3 -ffast-math 0m0.144s
4.3 -O3 -ffast-math -fno-tree-vectorize 0m0.167s
4.6 -O3 -ffast-math 0m0.194s
4.6 -O3 -ffast-math -fno-tree-vectorize 0m0.195s
4.6 -O3 -ffast-math -mavx 0m0.181s
trunk -O3 -ffast-math 0m0.127s
trunk -O3 -ffast-math -fno-tree-vectorize 0m0.176s
trunk -O3 -ffast-math -mavx 0m0.071s