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Reduce closure allocation in RenderObject.cleanRelayoutBoundary - #51439

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ferhatb merged 1 commit into
flutter:masterfrom
ferhatb:rivet_framework_optim1
Feb 26, 2020
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Reduce closure allocation in RenderObject.cleanRelayoutBoundary#51439
ferhatb merged 1 commit into
flutter:masterfrom
ferhatb:rivet_framework_optim1

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@ferhatb

@ferhatb ferhatb commented Feb 25, 2020

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Description

Changes visitChildren closure allocation to use static method instead.

Related Issues

Discovered while profiling web EAP client project.

Tests

Covered by gallery benchmark.

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@ferhatb
ferhatb requested a review from yjbanov February 25, 2020 22:16
@fluttergithubbot fluttergithubbot added the framework flutter/packages/flutter repository. See also f: labels. label Feb 25, 2020
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fluttergithubbot commented Feb 25, 2020

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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

@ferhatb
ferhatb requested a review from goderbauer February 26, 2020 00:23
goderbauer
goderbauer approved these changes Feb 26, 2020
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LGTM

@yjbanov

yjbanov commented Feb 26, 2020

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/cc @vsmenon @sigmundch could this also be improved in the compiler?

@ferhatb
ferhatb merged commit 1a79592 into flutter:master Feb 26, 2020
@vsmenon

vsmenon commented Feb 26, 2020

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@rakudrama - on optimizability

Non-trivial if compiler cannot identify whether visitChildren, etc rely on identity of the closure.

@rakudrama

rakudrama commented Feb 27, 2020

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This has been discussed at: dart-lang/sdk#26932
I'm prepared to break identity in optimizations - dart2js already GVNs repeated tear-offs which also have identity.

Since the language has evolved to have much richer static constraints (e.g. definite assignment is quite involved), I would advocate for a static definition of free variables and have the CFE hoist the functions.

@rakudrama

rakudrama commented Feb 27, 2020

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@leafpetersen How about updating the language spec so that closures with no free variables are more like static or top-level methods?

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@yjbanov yjbanov yjbanov approved these changes
@goderbauer goderbauer goderbauer approved these changes

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