WebAssembly/binaryen

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Optimizer and compiler/toolchain library for WebAssembly

Stars: 8.6k
Forks: 885
Open beginner issues: 0
Indexed issues: 332
Avg merge: 1d 19h
Merged PRs (30d): 69

Dominant language: WebAssembly
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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332 open issues indexed

How to define parameter names? Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

WebAssembly/binaryen#5748 · 2 comments · Opened Jun 2, 2023
StackCheck pass can do that wrong thing when no stack pointer is present Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#5741 · Opened May 24, 2023
Adding APIs for in-memory operation without fs access Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/binaryen#5736 · 8 comments · Opened May 19, 2023
`BrOn` does not support carrying additional values Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

WebAssembly/binaryen#5721 · 3 comments · Opened May 15, 2023
Verification error after function inlining Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#5719 · 5 comments · Opened May 12, 2023
wasm2js: unhandled unaligned store, UNREACHABLE executed at, Aborted Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#5688 · 3 comments · Opened Apr 25, 2023
Binaryen.js default stack size might be too low Open

interpreter

Difficulty 4/5 3-5 days Newbie friendliness 30/100

WebAssembly/binaryen#5648 · 1 comment · Opened Apr 9, 2023
SIMD add not being optimized away Open

good first bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#5633 · 2 comments · Opened Apr 5, 2023
optimize for if with return statement Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/binaryen#5549 · 2 comments · Opened Mar 7, 2023
--minify-imports should include module names Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#5546 · Opened Mar 4, 2023
Using two reloopers in one function can cause block name collisions. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#5466 · 3 comments · Opened Jan 30, 2023
Path variable to add in Windows Open

Difficulty 3/5 1-2 days Newbie friendliness 15/100

WebAssembly/binaryen#5405 · 2 comments · 1 reaction · Opened Jan 7, 2023
Support try-catch in Asyncify / lower wasm exceptions to MVP Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#5343 · 7 comments · Opened Dec 13, 2022
Consider running tests with -D_LIBCPP_ENABLE_ASSERTIONS=1 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/binaryen#5245 · 1 comment · Opened Nov 12, 2022
standalone (non-js) binaryen.wasm Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#5206 · 3 comments · Opened Nov 1, 2022
Provide a pkg-config file? Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#5201 · 1 comment · Opened Oct 31, 2022
wasm-opt: Optimize out store of load with traps-never-happen Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#5118 · 4 comments · Opened Oct 6, 2022
wasp-opt makes bcrypt code slower Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#5088 · 15 comments · Opened Sep 28, 2022
[Idea] Compress f64.const in integer domain for optimization for size Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#5020 · Opened Sep 6, 2022
Remove masks that are shifted out later Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#5011 · 1 comment · Opened Sep 2, 2022
Use getMaxBits in comparisons Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/binaryen#5010 · 4 comments · Opened Sep 2, 2022
Optimize checks for higher bits using a low bit mask Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#5009 · 1 comment · Opened Sep 2, 2022
Optimize comparisons of adjusted values Open

WebAssembly/binaryen#5008 · 4 comments · 1 assignee · Opened Sep 2, 2022
Avoid wrapping when 64-bit operations are enough Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#5007 · Opened Sep 2, 2022
Optimize sign checks on i8, i16 etc. Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

WebAssembly/binaryen#5006 · Opened Sep 2, 2022
Fold extend followed by operations that do not care about the extended bits Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/binaryen#5005 · Opened Sep 2, 2022
Avoid extend/wrap to 64 bits when 32 are enough Open

WebAssembly/binaryen#5004 · 1 comment · 1 assignee · Opened Sep 2, 2022
Add toehold docs for Asyncify Open

Difficulty 3/5 1-2 days Newbie friendliness 32/100

WebAssembly/binaryen#4971 · 1 comment · Opened Aug 26, 2022
[C-API / JS-API] Binaryen crash if recent "memoryName" is null for memory ops Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#4962 · Opened Aug 24, 2022
Dropped series of load ops to same address could be reduced to single op Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#4949 · Opened Aug 20, 2022
Add comments to multi-memories tests Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

WebAssembly/binaryen#4931 · Opened Aug 18, 2022
Change example tests to pass null for memory name Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

WebAssembly/binaryen#4930 · Opened Aug 18, 2022
Add assertion to RemoveUnusedModuleElements Open

Difficulty 2/5 1-3 hours Newbie friendliness 20/100

WebAssembly/binaryen#4929 · Opened Aug 18, 2022
Add multi-memories assert to MemoryPacking Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#4928 · Opened Aug 18, 2022
Add comment of memory assumption to wasm-debug Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

WebAssembly/binaryen#4925 · Opened Aug 18, 2022
Make readMemoryAccess() return value more explicit Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

WebAssembly/binaryen#4924 · Opened Aug 18, 2022
Halt stack.h with an error if multi-memories are present Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#4922 · Opened Aug 18, 2022
Add fatal errors to memory vector size checks Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#4920 · Opened Aug 17, 2022
Convert getMemoryOrNull to getMemory Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

WebAssembly/binaryen#4919 · Opened Aug 17, 2022
Refactor BinaryenSetMemory API Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#4918 · 3 comments · Opened Aug 17, 2022
Add helper `getSingleMemory` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#4915 · Opened Aug 17, 2022
Simplify mutable globals with single write in "start" Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

WebAssembly/binaryen#4892 · 1 comment · Opened Aug 10, 2022
Extra pass for v128 operands in exported functions and globals? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#4891 · 2 comments · Opened Aug 10, 2022
Code motion with the same side effects in branches does not always work Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#4858 · 4 comments · Opened Aug 1, 2022
Names section on the side Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#4841 · Opened Jul 28, 2022
Support for all optimization passes with DWARF output? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#4814 · 5 comments · Opened Jul 19, 2022
CSE for LEA-like operations Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#4796 · 11 comments · Opened Jul 12, 2022
asyncify - option to use multiple memories Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/binaryen#4772 · 2 comments · 2 reactions · Opened Jul 6, 2022
Aggressive optimization of `unreachable`s? Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

WebAssembly/binaryen#4744 · 6 comments · Opened Jun 21, 2022
In I64ToI32Lowering pass, lowerReinterpretFloat64() and lowerReinterpretInt64() are not multithreading, ASAN, STACK_OVERLOW_CHECK or SAFE_HEAP safe Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#4710 · Opened Jun 2, 2022

WebAssembly/binaryen

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