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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Convert more uops to leave their inputs on the stack to be cleaned up by `_POP_TOP`","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nThis is a follow up to https://github.com/python/cpython/issues/134584\n\nWe have, in the JIT, optimizations to eliminate many `_POP_TOP` operations. To take advantage of that we have converted many uops to leave their operands on the stack and added subsequent `_POP_TOP`s to remove them.\nSee https://github.com/python/cpython/issues/134584 for many examples of how to do this and why it works.\n\nHowever, there are still a few uops yet to do. These are:\n* LIST_EXTEND\n* DICT_UPDATE @Sacul0457\n* SET_UPDATE @Sacul0457\n* DICT_MERGE @NekoAsakura\n* CALL_INTRINSIC_1 @Sacul0457\n* CALL_INTRINSIC_2 @KevinH15291\n\nIn addition, `POP_ITER`, `END_FOR` and `END_SEND` can be implemented as macro ops, using `POP_TOP` to gain the benefit of the the `POP_TOP` optimization.\n\n\n### Has this already been discussed elsewhere?\n\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-145964\n* gh-145979\n* gh-146170\n* gh-146177\n* gh-146185\n* gh-146190\n* gh-146262\n* gh-146329\n* gh-146383\n* gh-148227\n* gh-148477\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/markshannon","@type":"Person","name":"markshannon"},"datePublished":"2026-03-12T13:58:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":21},"url":"https://github.com/145866/cpython/issues/145866"}