------- 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.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25500
