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GeezerVison is showing github.com — gh-160245: Reduce padding in Memo by ashm-dev · Pull Request #160266 · python/cpython

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@ashm-dev

@ashm-dev ashm-dev commented Oct 22, 2026 •
edited by bedevere-app Bot
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Move mark immediately after type to eliminate the two alignment gaps in Memo.

On the tested x86-64 GCC build, this reduces sizeof(Memo) from 32 to 24 bytes without changing any field types. No parser behavior or public API changes are intended.

Verified with pahole. The following tests pass on a default build: test_grammar, test_syntax, test_compile, and test_peg_generator.

Closes #160245.

  • Issue: Reduce padding in parser memo entries #160245

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@ashm-dev
perf(parser): reduce padding in Memo
cc4ed16
@ashm-dev
ashm-dev requested review from lysnikolaou and pablogsal as code owners October 22, 2026 17:13
@bedevere-app bedevere-app Bot added the type-feature A feature request or enhancement label Oct 22, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 22, 2026
Reduce padding in parser memo entries #160245
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@bedevere-app bedevere-app Bot added the awaiting review label Oct 22, 2026
@ashm-dev
Merge branch 'main' into pythongh-160245
1767bdf
pablogsal
pablogsal approved these changes Oct 22, 2026
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Oct 22, 2026
@pablogsal

pablogsal commented Oct 22, 2026

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Thanks for the PR! 🚀
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@pablogsal
pablogsal enabled auto-merge (squash) October 22, 2026 18:41
@pablogsal
pablogsal merged commit f65e2a2 into python:main Oct 22, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label Oct 22, 2026
@ashm-dev
ashm-dev deleted the gh-160245 branch October 22, 2026 18:42
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@pablogsal pablogsal pablogsal approved these changes
@lysnikolaou lysnikolaou Awaiting requested review from lysnikolaou lysnikolaou is a code owner

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Reduce padding in parser memo entries

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@ashm-dev @pablogsal
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