rust-lang / rust-lang/rustc_codegen_cranelift
Math operations for f16 incorrectly implemented
Open
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C-bug
- Dominant language
- Rust
- Stars
- 2.1k
- Forks
- 157
- Avg merge
- 1d 19h
- Merged PRs (30d)
- 3
Description
libm has no such intrinsics as logf16 and roundf16. Discovered in https://github.com/rust-lang/rust/pull/148206#issuecomment-3728270321.
Contributor guide
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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 by tracing how f16 math operations are lowered in the rustc_codegen_cranelift repository, using the referenced Rust pull request and issue comment as context. Check the handling of log and round operations and identify the valid libm alternatives; done means the backend no longer refers to nonexistent logf16 or roundf16 intrinsics.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100