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GeezerVison is showing github.com — gh-161875: Push NULL and None in GET_ANEXT by asvetlov · Pull Request #161877 · python/cpython

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@asvetlov

@asvetlov asvetlov commented Nov 12, 2026 •
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GET_ANEXT was always followed by PUSH_NULL; LOAD_CONST None to set up the stack for SEND. It now pushes (aiter, awaitable, NULL, None) itself, so each async for iteration (including async comprehensions and async generator expressions) runs GET_ANEXT; SEND.

🤖 Generated with Claude Code

  • Issue: Fold PUSH_NULL; LOAD_CONST None into GET_AWAITABLE and GET_ANEXT #161875

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@asvetlov @claude
pythongh-161875: Push NULL and None in GET_ANEXT
273c4db 
Every async for iteration compiled to GET_ANEXT; PUSH_NULL;
LOAD_CONST None; SEND. GET_ANEXT is always followed by that pair, so let
it push (aiter, awaitable, NULL, None) itself, saving two dispatches per
iteration.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
@bedevere-app bedevere-app Bot mentioned this pull request Nov 12, 2026
Fold PUSH_NULL; LOAD_CONST None into GET_AWAITABLE and GET_ANEXT #161875
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@asvetlov asvetlov added the interpreter-core (Objects, Python, Grammar, and Parser dirs) label Nov 12, 2026
@asvetlov
asvetlov marked this pull request as ready for review November 12, 2026 15:36
@asvetlov
asvetlov requested review from Fidget-Spinner, iritkatriel, markshannon and tomasr8 as code owners November 12, 2026 15:36
@bedevere-app bedevere-app Bot added the awaiting core review label Nov 12, 2026
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@markshannon markshannon Awaiting requested review from markshannon markshannon is a code owner
@tomasr8 tomasr8 Awaiting requested review from tomasr8 tomasr8 is a code owner
@Fidget-Spinner Fidget-Spinner Awaiting requested review from Fidget-Spinner Fidget-Spinner is a code owner
@iritkatriel iritkatriel Awaiting requested review from iritkatriel iritkatriel is a code owner

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@asvetlov
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