WebAssembly / WebAssembly/binaryen

Change default inlining behavior to favor single-caller inlines

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help wanted
Dominant language
WebAssembly
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Merged PRs (30d)
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Description

See FIXMEs introduced in: https://github.com/WebAssembly/binaryen/pull/2125

Essentially, the check for calls == 1 need to be moved first in that function, otherwise oneCallerInlineMaxSize can never be bigger than flexibleInlineMaxSize, which naturally it would make sense for it to be.

@kripken mentioned this change can only be made after it has been checked if it doesn't regress size/speed.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the FIXME changes introduced by pull request 2125 and locate the inlining function containing the calls == 1 check. Verify the ordering change against size and speed measurements before considering the work done; the issue provides no specific test or benchmark file.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp, wasm
Domain
compilers, performance
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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