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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Widen specialized int fast paths to full int64 range","articleBody":"This work widens the interpreter’s specialized `int` fast paths (tier-2 / uop execution) from the compact-only range to the full `int64_t` range.\n\nIt also fixes follow-up correctness issues in the widened specialized paths for non-compact exact `PyLongObject`s and on 15-bit builds.\n\nScope:\n- widen specialized integer add/subtract/multiply fast paths to operate across the full `int64_t` range\n- accept exact `int` operands that fit in `int64_t`, including non-compact `PyLongObject`s\n- keep specialized in-place mutation compact-only and fall back safely for non-compact inputs\n- handle widened integer compare without compact-only assumptions\n- construct widened arithmetic results with `PyLong_FromInt64()` so 15-bit builds do not narrow through `stwodigits`\n- add regression coverage for widened operations, non-compact exact ints, boundary cases, and overflow fallback\n- add benchmark scripts for measuring widened specialized integer fast-path performance\n\n\u003c!-- gh-linked-prs -->\n### Linked PRs\n* gh-150425\n\u003c!-- /gh-linked-prs -->\n","author":{"url":"https://github.com/KRRT7","@type":"Person","name":"KRRT7"},"datePublished":"2026-05-25T18:58:12Z","url":"https://github.com/python/cpython/issues/150424"}