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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Use shared helper function for faster index range checks","articleBody":"#9784 (discussed in #72583 and #67741) introduced a helper function to reduce the number of comparisons in list index range checks (see https://godbolt.org/z/jM8oexT1d).\r\n\r\nThe same pattern can be applied in many other places in the code base like in `arraymodule.c`, `mmapmodule.c`, `bytearrayobject.c`, etc.\r\n\r\nI'd propose to extract this helper function into a header and start using it in more places for index range checks. [`internal/pycore_abstract.h`](https://github.com/python/cpython/blob/main/Include/internal/pycore_abstract.h) seems like it might be a decent place to put this helper in.\r\n\r\nI'm happy to make a PR if people think a micro optimisation like this justifies the code churn, but let me know if I'm missing something.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-120181\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/lgeiger","@type":"Person","name":"lgeiger"},"datePublished":"2024-06-06T19:32:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/120176/cpython/issues/120176"}