New submission from Serhiy Storchaka: The expression for testing that some index is in half-open range from 0 to limit can be written as
index >= 0 && index < limit or as (size_t)index < (size_t)limit The latter form generates simpler machine code. This is idiomatic code, it is used in many C and C++ libraries (including C++ stdlib implementations). It already is used in CPython (in deque implementation). Proposed patch rewrites index range checks in more efficient way. The patch was generated automatically by coccinelle script, and then manually cleaned up. ---------- components: Extension Modules, Interpreter Core files: check_index.patch keywords: patch messages: 278355 nosy: serhiy.storchaka priority: normal severity: normal stage: patch review status: open title: Faster index range checks type: performance versions: Python 3.7 Added file: http://bugs.python.org/file45034/check_index.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28397> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com