New submission from Serhiy Storchaka <[email protected]>:
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
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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
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Python tracker <[email protected]>
<https://bugs.python.org/issue33200>
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