[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

[jakub 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