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GeezerVison is showing github.com — gh-161875: Push NULL and None in GET_AWAITABLE by asvetlov · Pull Request #161876 · python/cpython

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@asvetlov

@asvetlov asvetlov commented Nov 12, 2026 •
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GET_AWAITABLE was always followed by PUSH_NULL; LOAD_CONST None to set up the stack for SEND. It now pushes (iter, NULL, None) itself, so await f() compiles to CALL; GET_AWAITABLE; SEND.

🤖 Generated with Claude Code

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

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asvetlov and others added 2 commits November 12, 2026 11:38
@asvetlov @claude
Push NULL and None in GET_AWAITABLE
acef71f 
Every await site compiled to GET_AWAITABLE; PUSH_NULL; LOAD_CONST None;
SEND. GET_AWAITABLE is always followed by that pair, so let it push
(iter, NULL, None) itself. `await f()` now compiles to
CALL; GET_AWAITABLE; SEND, saving two dispatches per await.

The tier-2 optimizer gets an override so the NULL and None slots are
known constants.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
@asvetlov @claude
Add NEWS entry
6d6c855 
Co-Authored-By: Claude Opus 5.5 <[email protected]>
@bedevere-app bedevere-app Bot added the type-feature A feature request or enhancement label Nov 12, 2026
@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
Open
@asvetlov asvetlov added performance Performance or resource usage interpreter-core (Objects, Python, Grammar, and Parser dirs) and removed type-feature A feature request or enhancement labels Nov 12, 2026
@asvetlov asvetlov mentioned this pull request Nov 12, 2026
gh-161875: Push NULL and None in GET_ANEXT #161877
Open
@asvetlov asvetlov removed the performance Performance or resource usage label Nov 12, 2026
@asvetlov
asvetlov marked this pull request as ready for review November 12, 2026 15:35
@asvetlov
asvetlov requested review from Fidget-Spinner, iritkatriel, markshannon and tomasr8 as code owners November 12, 2026 15:35
@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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