WebAssembly / WebAssembly/binaryen
Once Reduction Pass improvement
Open
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- Dominant language
- WebAssembly
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- Merged PRs (30d)
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Description
Recent Once Reduction pass properly handled following CFG in pseudocode:
bool initialized = false;
void boo() {
if (initialized) return;
...
initialized = true;
}
but unsound for this:
bool initialized = false;
void boo() {
if (!initialized) {
...
initialized = true;
}
}
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 linked PR #4111 and locate the Once Reduction pass implementation, then compare its handling of the two CFG shapes shown in the issue. Add a regression test for the second example and verify that the optimization no longer produces unsound behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, wasm
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100