------- Comment #15 from ubizjak at gmail dot com 2007-07-09 18:16 ------- New timings on x86_64 core2 (from [1])
The tests were performed on core2 in 64bit mode, using '-DREPS=10000 -O3 -msse3 -march=core2 -ffast-math' flags, with and without newly introduced -fno-tree-reassoc flag. The results were _interesting_, showing extreme differences in the run times: w/o -fno-tree-reassoc: ALGORITHM NB REPS TIME MFLOPS ========= ===== ===== ========== ========== -DTYPE=float: atlasmm 60 10000 2.000 2159.87 -DTYPE=double: atlasmm 60 10000 2.500 1727.89 w/ -fno-tree-reassoc: ALGORITHM NB REPS TIME MFLOPS ========= ===== ===== ========== ========== -DTYPE=float: atlasmm 60 10000 0.932 4634.90 -DTYPE=double: atlasmm 60 10000 1.520 2841.93 [1] http://gcc.gnu.org/ml/gcc-patches/2007-07/msg00849.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27855
