New submission from Sergey Fedoseev <fedoseev.ser...@gmail.com>:
When compiled with default NSMALLPOSINTS, _PyLong_FromUnsignedChar() is significantly faster than other PyLong_From*(): $ python -m perf timeit -s "from collections import deque; consume = deque(maxlen=0).extend; b = bytes(2**20)" "consume(b)" --compare-to=../cpython-master/venv/bin/python /home/sergey/tmp/cpython-master/venv/bin/python: ..................... 7.10 ms +- 0.02 ms /home/sergey/tmp/cpython-dev/venv/bin/python: ..................... 4.29 ms +- 0.03 ms Mean +- std dev: [/home/sergey/tmp/cpython-master/venv/bin/python] 7.10 ms +- 0.02 ms -> [/home/sergey/tmp/cpython-dev/venv/bin/python] 4.29 ms +- 0.03 ms: 1.66x faster (-40%) It's mostly useful for bytes/bytearray, but also can be used in several other places. ---------- components: Interpreter Core messages: 349540 nosy: sir-sigurd priority: normal severity: normal status: open title: add internal _PyLong_FromUnsignedChar() function type: performance versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37837> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
