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

Inlining breaks asyncify Open

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

WebAssembly/binaryen#4681 · 2 comments · Opened May 23, 2022
Add APIs for introspection of imports Open

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

WebAssembly/binaryen#4643 · Opened May 4, 2022
wasm-opt performance Open

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

WebAssembly/binaryen#4619 · 16 comments · Opened Apr 27, 2022
Missing SIMD impls in interpreter Open

WebAssembly/binaryen#4600 · 1 comment · 1 assignee · Opened Apr 20, 2022
SIMD types and instructions aren't documented in the JS API Open

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

WebAssembly/binaryen#4592 · 4 comments · Opened Apr 13, 2022
Support GC to non-GC conversion Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#4590 · 4 comments · 12 reactions · Opened Apr 11, 2022
[wasm-as/wasm-dis]: Don't say the input/output is WebAssembly Text because it's not Open

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

WebAssembly/binaryen#4550 · 4 comments · Opened Mar 26, 2022
[wasm-ctor-eval] Any way to zero the stack after calling wasm-ctor-eval? Open

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

WebAssembly/binaryen#4527 · 8 comments · Opened Mar 14, 2022
RedundantSetElimination: Nondeterminism testcase Open

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

WebAssembly/binaryen#4524 · 2 comments · Opened Mar 2, 2022
64-bit atomic load not implemented Open

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

WebAssembly/binaryen#4519 · 1 comment · 1 reaction · Opened Feb 22, 2022
wasm2js does not support 64-bit memories Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

WebAssembly/binaryen#4518 · 3 comments · Opened Feb 19, 2022
Support Asyncify + Try-Catch [Can't build web-gphoto2 with -fwasm-exceptions instead of -fexceptions] Open

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

WebAssembly/binaryen#4470 · 8 comments · Opened Jan 21, 2022
SmallVector could call constructors only when relevant Open

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

WebAssembly/binaryen#4452 · 3 comments · Opened Jan 13, 2022
darwin/amd64: dyld: 'BinaryenTypeCreate' missing symbol called Open

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

WebAssembly/binaryen#4436 · 2 comments · Opened Jan 9, 2022
Replacing `memset` and `memcpy` calls with `memory.fill` and `memory.copy`? Open

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

WebAssembly/binaryen#4403 · 13 comments · Opened Dec 20, 2021
Program terminated with signal SIGKILL, Killed. Open

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

WebAssembly/binaryen#4392 · 3 comments · Opened Dec 14, 2021
A stack-overflow in printf_common() Open

interpreter

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

WebAssembly/binaryen#4391 · 4 comments · Opened Dec 14, 2021
Missing 64-bit AtomicCmpxchg causes `__sync_fetch_and_nand` to fail under wasm2js Open

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

WebAssembly/binaryen#4358 · 2 comments · Opened Nov 24, 2021
[Proposal] Add getMaxSignBits for tracking sign values Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

WebAssembly/binaryen#4329 · Opened Nov 14, 2021
Optimize compressed size better Open

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

WebAssembly/binaryen#4322 · 2 comments · 1 reaction · Opened Nov 11, 2021
Priority list for OptimizeInstructions reviews Open

Difficulty 2/5 1-3 hours Newbie friendliness 18/100

WebAssembly/binaryen#4277 · 1 comment · Opened Oct 25, 2021
Redundant global read Open

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

WebAssembly/binaryen#4274 · 5 comments · Opened Oct 24, 2021
Merge two if-blocks into one if conditions the same Open

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

WebAssembly/binaryen#4268 · 2 comments · Opened Oct 21, 2021
wasm-emscripten-finalize runs out of memory with -g option Open

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

WebAssembly/binaryen#4261 · 6 comments · 1 reaction · Opened Oct 19, 2021
Add option to force table elements to be considered immutable Open

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

WebAssembly/binaryen#4256 · 6 comments · Opened Oct 18, 2021
Add sign bit tacking for floating points Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

WebAssembly/binaryen#4253 · Opened Oct 15, 2021
Missing opportunity for redundant set elimination Open

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

WebAssembly/binaryen#4175 · Opened Sep 22, 2021
Improve selectify Open

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

WebAssembly/binaryen#4166 · 2 comments · Opened Sep 18, 2021
Make compilation faster :rocket: Open

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

WebAssembly/binaryen#4165 · 39 comments · 6 reactions · Opened Sep 17, 2021
[New Optimization Proposal] Propagate conditional result to branch / switch arms Open

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

WebAssembly/binaryen#4161 · 5 comments · Opened Sep 17, 2021
struct.get is silently turned into struct.get_u for packed fields Open

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

WebAssembly/binaryen#4129 · Opened Sep 8, 2021
Once Reduction Pass improvement Open

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

WebAssembly/binaryen#4124 · Opened Sep 5, 2021
LICM pass stopped working Open

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

WebAssembly/binaryen#4093 · 17 comments · Opened Aug 18, 2021
plan to create DWARF section Open

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

WebAssembly/binaryen#4026 · 8 comments · Opened Jul 27, 2021
Invalid optimization to select with --ignore-implicit-traps Open

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

WebAssembly/binaryen#3934 · 9 comments · Opened Jun 16, 2021
Do not pop from the polymorphic stack (was: Parse expection on unreachable struct.set) Open

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

WebAssembly/binaryen#3922 · 6 comments · Opened Jun 7, 2021
asyncify_get_state is not generated by wasm-opt Open

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

WebAssembly/binaryen#3921 · 1 comment · Opened Jun 5, 2021
no 32bit binaries... fails to compile with latest mingw Open

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

WebAssembly/binaryen#3903 · 1 comment · Opened May 23, 2021
--duplicate-function-elimination and "names" section Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

WebAssembly/binaryen#3867 · 1 comment · Opened May 7, 2021
[Proposal] Optimization for AoS with SIMD Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#3854 · Opened May 3, 2021
Asyncify "OOM" leaves broken state Open

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

WebAssembly/binaryen#3839 · 17 comments · Opened Apr 23, 2021
[proposal] Dead Store Elimination Pass Open

WebAssembly/binaryen#3772 · 1 comment · 1 assignee · Opened Apr 5, 2021
Flatten pass can make invalid modules on tuple types Open

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

WebAssembly/binaryen#3759 · 1 comment · Opened Mar 30, 2021
Reference types crash wasm-opt‘s asyncify pass Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

WebAssembly/binaryen#3739 · 24 comments · 2 reactions · Opened Mar 25, 2021
Bad interaction with tuples and local.tee using the value type Open

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

WebAssembly/binaryen#3704 · 10 comments · Opened Mar 18, 2021
Iterator related warnings in visual studio build Open

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

WebAssembly/binaryen#3661 · Opened Mar 5, 2021
CoalesceLocals N^2 memory usages of "copies" (affects AddressSanitizer -O3 builds on large wasm file) Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

WebAssembly/binaryen#3646 · 11 comments · Opened Mar 3, 2021
[Wasm Exceptions] Support Inlining of content with Try-Delegate Open

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

WebAssembly/binaryen#3634 · Opened Mar 1, 2021
wasm-dis should run validation Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

WebAssembly/binaryen#3545 · 9 comments · Opened Feb 4, 2021
Split-dwarf support Open

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

WebAssembly/binaryen#3518 · Opened Jan 26, 2021

WebAssembly/binaryen

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