New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>: The following PR optimizes bytecode for the empty set "literal": {*()}.
Currently it is compiled to LOAD_CONST 0 (()) BUILD_SET_UNPACK 1 It will optimized to BUILD_SET 0 $ ./python -m perf timeit --duplicate 1000 '{*()}' Unpatched: Mean +- std dev: 68.6 ns +- 1.1 ns Patched: Mean +- std dev: 31.8 ns +- 2.8 ns ---------- components: Interpreter Core messages: 314769 nosy: benjamin.peterson, brett.cannon, ncoghlan, serhiy.storchaka, yselivanov priority: normal severity: normal status: open title: Optimize the empty set "literal" type: performance versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33200> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com