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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" JIT optimizer cleanups","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nCurrently the JIT uop buffer modifies uops traces in place.\n\nI think we should make it add to a new buffer. Having modifications be in-place is making our code messy and full of special cases.\n\nSo\n```\nREPLACE_OP(this_instr, ...)\n```\nshould become\n```\nADD_OP(ctx, ...)\n```\n\nin `optimizer_bytecodes.c`,\n\nAlso, the default generated case of optimizer_bytecodes.c should be to `ADD_OP(pc, ...)`\n\nThis is also blocking optimization in https://github.com/python/cpython/issues/143414, as ocassionally we need to insert extra guards to check the uniqueness of an object for example.\n\n### Has this already been discussed elsewhere?\n\nNo response given\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-143536\n* gh-143597\n* gh-143626\n* gh-143682\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Fidget-Spinner","@type":"Person","name":"Fidget-Spinner"},"datePublished":"2026-01-04T21:44:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/143421/cpython/issues/143421"}