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GH-140683: JIT: Improve machine code for loading smaller constants on AArch64. by markshannon · Pull Request #142511 · python/cpython · GitHub

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GH-140683: JIT: Improve machine code for loading smaller constants on AArch64. - #142511

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markshannon merged 4 commits into
python:mainfrom
markshannon:optimize-consts-16-and-32
Dec 11, 2025
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GH-140683: JIT: Improve machine code for loading smaller constants on AArch64.#142511
markshannon merged 4 commits into
python:mainfrom
markshannon:optimize-consts-16-and-32

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markshannon commented Dec 10, 2025 •
edited by bedevere-app Bot
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  • Use movz and movk instructions for loading 16 and 32 bit operands and oparg.
  • Loading of 64 bit operands is unchanged.

JIT: Improve machine code for loading smaller constants on AArch64.
8110012 
* Use movz and movk instructions for loading 16 and 32 bit operands and oparg.
* Loading of 64 bit operands is unchanged.
bedevere-app Bot mentioned this pull request Dec 10, 2025
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diegorusso approved these changes Dec 11, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I've discussed at depth with Mark about this change before creating the PR. LGTM

markshannon merged commit 4eab90f into python:main Dec 11, 2025
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fatelei pushed a commit to fatelei/cpython that referenced this pull request Dec 12, 2025
pythonGH-140683: JIT: Improve machine code for loading smaller consta…
cc13eb0 
…nts on AArch64. (pythonGH-142511)

* Use movz and movk instructions for loading 16 and 32 bit operands and oparg.
* Loading of 64 bit operands is unchanged.
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diegorusso diegorusso approved these changes
brandtbucher Awaiting requested review from brandtbucher brandtbucher is a code owner
savannahostrowski Awaiting requested review from savannahostrowski

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