RoaringBitmap / RoaringBitmap/CRoaring
Use SIMD bitset decoding when appropriate
Open
Nobody has claimed this yet.
help wanted
performance
- Dominant language
- C
- Stars
- 1.9k
- Forks
- 334
- Avg merge
- 2d 5h
- Merged PRs (30d)
- 17
Description
For dense bitsets, we should use SIMD instructions.
See: Iterating over set bits quickly (SIMD edition) https://lemire.me/blog/2018/03/08/iterating-over-set-bits-quickly-simd-edition/
Note that it is not a good idea for sparse bitsets.
Contributor guide
No contributing guide indexed for this repository
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 reading the linked “Iterating over set bits quickly (SIMD edition)” article and the issue’s dense-versus-sparse constraint. Then inspect the repository to identify the bitset decoding entry point and existing SIMD support; done means dense bitsets use SIMD appropriately without applying it to sparse bitsets.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100