`<bit>`: Investigate Clang's new intrinsics for bit operations
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performance
- Dominant language
- C++
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Description
Clang 19 has these new generic intrinsics which are possibly useful for <bit>:
__builtin_ctzg__builtin_clzg__builtin_popcountg
It seems that they are at least beneficial for throughput, but we should also investigate their performance impact.
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
Start at the implementation and inspect how the existing bit-operation entry points could use Clang 19's __builtin_ctzg, __builtin_clzg, and __builtin_popcountg. Measure their throughput impact and document whether the intrinsics are beneficial; the issue names no specific files or tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- performance
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100