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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Enable specialization of iteration over generators, `for gen():`, and awaiting coroutines, `await coro()`","articleBody":"We want to be able to specialize iteration over generators and awaiting coroutines. Both for PEP 659 and for higher tier optimizers.\r\n\r\nFor the theory see https://github.com/faster-cpython/ideas/issues/457\r\n\r\nTo do this we need:\r\n\r\n- [x] Shim frames to keep the various returns simple https://github.com/python/cpython/pull/96319\r\n- [x] Modify `FOR_ITER` to leave iterator and value on the stack when exiting https://github.com/python/cpython/pull/96801\r\n- [x] Implement specialization of `FOR_ITER` for generators https://github.com/python/cpython/pull/98772\r\n- [x] Implement specialization of `SEND` for coroutines\r\n\r\n\r\n\r\nEdited:\r\nRemove the requirement for a `GEN_RETURN_VALUE` instruction. We might want one to simplify frame popping, but it isn't needed for specializing.\n\n\u003c!-- gh-pr-number: gh-99006 --\u003e\n* PR: gh-99006\n\u003c!-- /gh-pr-number --\u003e\n\n\n\u003c!-- gh-pr-number: gh-98772 --\u003e\n* PR: gh-98772\n\u003c!-- /gh-pr-number --\u003e\n","author":{"url":"https://github.com/markshannon","@type":"Person","name":"markshannon"},"datePublished":"2022-09-13T11:51:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/96793/cpython/issues/96793"}