WebAssembly / WebAssembly/binaryen
Recreate and optimize control flow
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- WebAssembly
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Description
We have a relooper API, which allows an arbitrary CFG as input, but it would also be useful to receive a wasm and go back to an arbitrary CFG from there. This would let us better optimize wasms not generated by us.
For example, the loop-switch pattern is something specifically worth making sure we can optimize well https://github.com/pipcet/asmjs/issues/7#issuecomment-287445096
Recreating a CFG is fairly easy (we have the CFGWalker for that). However, to fully optimize the loop-switch pattern and other things, we'd need to identify and utilize control flow / jump threading variables too.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the relooper API and CFGWalker mentioned in the issue, then review the linked loop-switch example. Determine how a wasm input should be converted into an arbitrary CFG and how control-flow or jump-threading variables would be identified. Done means the resulting CFG can support optimization of the loop-switch pattern and similar cases.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- wasm
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100