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[Bug target/25500] [4.0/4.1/4.2 Regression]: SSE2 vectorized code is many times slower on 4.x.x than on 3.4.4
- From: "jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Dec 2005 16:53:27 -0000
- Subject: [Bug target/25500] [4.0/4.1/4.2 Regression]: SSE2 vectorized code is many times slower on 4.x.x than on 3.4.4
- References: <bug-25500-6649@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from jakub at gcc dot gnu dot org 2005-12-28 16:53 -------
Benchmarking -mtune=i386 tuned code on Athlon64 is simply a bad idea.
Either you need to tune for your CPU (or at least some contemporary one
like -mtune=pentium4 if you want to run quickly on a wider range of CPUs),
or you should be benchmarking on real i386 hardware.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25500