Yury Selivanov added the comment: Attaching a second version of the patch. (BTW, Serhiy, I tried your idea of using a switch statement to optimize branches (https://github.com/1st1/cpython/blob/fastint2/Python/ceval.c#L5390) -- no detectable speed improvement).
I decided to add fast path for floats & single-digit longs and their combinations. +, -, *, /, //, and their inplace versions are optimized now. I'll have a full result of macro-benchmarks run tomorrow morning, but here's a result for spectral_norm (rigorous run, best of 3): ### spectral_norm ### Min: 0.300269 -> 0.233037: 1.29x faster Avg: 0.301700 -> 0.234282: 1.29x faster Significant (t=399.89) Stddev: 0.00147 -> 0.00083: 1.7619x smaller Some nano-benchmarks (best of 3): -m timeit -s "loops=tuple(range(100))" "sum([x + x + 1 for x in loops])" 2.7 7.23 3.5 8.17 3.6 7.57 -m timeit -s "loops=tuple(range(100))" "sum([x + x + 1.0 for x in loops])" 2.7 9.08 3.5 11.7 3.6 7.22 -m timeit -s "loops=tuple(range(100))" "sum([x/2.2 + 2 + x*2.5 + 1.0 for x in loops])" 2.7 17.9 3.5 24.3 3.6 11.8 ---------- Added file: http://bugs.python.org/file41799/fastint2.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21955> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
