WebAssembly / WebAssembly/binaryen
optimize for if with return statement
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- Dominant language
- WebAssembly
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Description
I have this code snippet
local.get $0
if
local.get $0
i32.const 1
i32.add
return
end
local.get $0
if
i32.const 100
return
end
local.get $0
It can be optimized to
local.get 0
if ;; label = @1
local.get 0
i32.const 1
i32.add
return
end
local.get 0
if ;; label = @1
i32.const 100
return
end
local.get 0
But it can be optimized as following code because second if conditional is always false.
local.get 0
if ;; label = @1
local.get 0
i32.const 1
i32.add
return
end
local.get 0
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
The issue names no source file or test. Reproduce the supplied WAT snippet through Binaryen's optimizer, then trace the optimization handling the conditional returns; done when the second if is removed while behavior remains equivalent.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- wasm
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100