[Python-Dev] 64 bit units in PyLong

Victor Stinner victor.stinner at gmail.com
Mon Jul 3 04:05:20 EDT 2017

2017-07-03 6:52 GMT+02:00 Siyuan Ren <netheril96 at gmail.com>:
> The current PyLong implementation represents arbitrary precision integers in
> units of 15 or 30 bits. I presume the purpose is to avoid overflow in
> addition , subtraction and multiplication. But compilers these days offer
> intrinsics that allow one to access the overflow flag, and to obtain the
> result of 64 bit multiplication as a 128 bit number.

The question is the performance. Is it fast? :-)

You can try to write a patch and run a benchmark.

See for example http://pyperformance.readthedocs.io/ for benchmarks.


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