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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"JIT: add _RROT_3 uop to reduce stack moves","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nAccording to @markshannon's note https://github.com/python/cpython/pull/148816#issuecomment-4335369185\n\u003e Note:\nIt might be worth adding `ROT_3` and a `RROT_3` uops to use in the optimizer and the peepholer.\nA `SWAP_2; SWAP_3` takes 6 moves, but `ROT_3` only takes 4.\n\nTwo narrowings:\n- No `_ROT_3` as `_SWAP 2; _SWAP 3` adjacent doesn't exist.\n- No separate peephole pass as it would never fire.\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-149205\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/NekoAsakura","@type":"Person","name":"NekoAsakura"},"datePublished":"2026-04-30T22:52:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/149204/cpython/issues/149204"}