rust-lang / rust-lang/rustc_codegen_gcc
Optimize the code generation for builtins implemented manually
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enhancement
good first issue
perf
- Dominant language
- Rust
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Description
I noticed that some builtins like bitreverse produce slower code than the LLVM backend, so it'd be good to optimize them.
This includes SIMD intrinsics since some of them were implemented without SIMD instructions.
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 files, tests, or entry points. Start by locating manually implemented builtins and SIMD intrinsics, then compare their generated code with the LLVM backend. Done means the affected builtins produce optimized code comparable to the LLVM implementation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Refactor
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100