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gh-126835: Move optimization of constant sequence creation from codegen to CFG #129426

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merged 16 commits into from
Feb 1, 2025
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gh-126835: Move optimization of constant sequence creation from codegen to CFG #129426

merged 16 commits into from
Feb 1, 2025
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@Eclips4 Eclips4 commented Jan 29, 2025 •
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@Eclips4 Eclips4 requested a review from tomasr8 January 29, 2025 08:56
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@Eclips4 Eclips4 marked this pull request as draft January 29, 2025 09:22
@Eclips4 Eclips4 marked this pull request as ready for review January 29, 2025 10:45
iritkatriel
iritkatriel reviewed Jan 29, 2025
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@Eclips4 Eclips4 requested a review from iritkatriel January 29, 2025 21:07
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Some questions, suggestions and nitpicks.

Eclips4 and others added 2 commits January 31, 2025 18:28
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670478d 
Co-authored-by: Yan Yanchii <yyanchiy@gmail.com>
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Address Yan's review
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@Eclips4 Eclips4 requested a review from WolframAlph January 31, 2025 17:37
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Looks good to me

iritkatriel
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LGTM

@Eclips4 Eclips4 enabled auto-merge (squash) February 1, 2025 10:31
@Eclips4 Eclips4 merged commit 7d0521d into python:main Feb 1, 2025
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@Eclips4 Eclips4 deleted the move-codegen-optimization branch February 4, 2025 17:43
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@Eclips4 , all tests pass when I disable this optimization. Is it intended? Shouldn't we have some tests for this?

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Eclips4 commented Feb 5, 2025

@Eclips4 , all tests pass when I disable this optimization. Is it intended? Shouldn't we have some tests for this?

Yes, it's expected. There are existing tests that test this. You can see one of them in this PR, which I needed to tweak.

srinivasreddy pushed a commit to srinivasreddy/cpython that referenced this pull request Feb 7, 2025
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pythongh-126835: Move optimization of constant sequence creation from…
8c655c7 
… codegen to CFG (python#129426)

Codegen phase has an optimization that transforms
```
LOAD_CONST x
LOAD_CONST y
LOAD_CONXT z
BUILD_LIST/BUILD_SET (3)
```
->
```
BUILD_LIST/BUILD_SET (0)
LOAD_CONST (x, y, z)
LIST_EXTEND/SET_UPDATE 1
```
This optimization has now been moved to CFG phase to make python#128802 work.


Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
Co-authored-by: Yan Yanchii <yyanchiy@gmail.com>
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@WolframAlph WolframAlph WolframAlph approved these changes

@iritkatriel iritkatriel iritkatriel approved these changes

@tomasr8 tomasr8 Awaiting requested review from tomasr8

@markshannon markshannon Awaiting requested review from markshannon markshannon is a code owner

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@Eclips4 @WolframAlph @iritkatriel