gh-138679: Opcodes which consume no inputs should indicate they produced the val…#138678
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iritkatriel
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Sep 8, 2025
| int net_pushed = num_pushed - num_popped; | ||
| assert(net_pushed >= 0); | ||
| for (int i = 0; i < net_pushed; i++) { | ||
| for (int j = 0; j < net_pushed; j++) { |
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mpage
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Sep 8, 2025
| self.assertNotInBytecode(f, "LOAD_FAST_CHECK") | ||
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| def test_import_from_doesnt_clobber_load_fast_borrow(self): | ||
| import dis |
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…ue, not an arbitrary local
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lkollar
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Sep 9, 2025
… produced the val… (python#138678) Opcodes which consume no inputs should indicate they produced the value, not an arbitrary local
facebook-github-bot
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Sep 9, 2025
Summary: Fixing another issue in the borrowed load analysis: python/cpython#138678 Reviewed By: mpage Differential Revision: D81950973 fbshipit-source-id: f6663befbcc36b159cbb03a20354d4452e1e47f8
facebook-github-bot
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Sep 10, 2025
Summary: There's one thing the AI got wrong - the check to see if we're doing a load super attr isn't quite right There's also an issue in the upstream analysis - the adding of refs for instructions which only produce things is adding a ref associated with the incorrect instruction. It shouldn't be the iteration for the number of pushed values, it should be for the current instruction. This will be fixed upstream with python/cpython#138678 and backported to 3.14 with D81950973. Reviewed By: mpage Differential Revision: D81642077 fbshipit-source-id: 4c8fe7f33fe38fb23c1cbf83074649f272898f71
colesbury
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Feb 6, 2026
…ate they produced the val… (python#138678)" This reverts commit 1561385.
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The load fast borrow analysis is marking the instruction index of opcodes which produce no locals as the delta (so always 0, 1, etc...) and not as the instruction that consumes no opcodes (the outer i).