Autovectorization on x86
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- rust
- Domain
- performance
Research direction
Start with the two implementations in the linked Godbolt example, nd_mul_u64_view and nd_mul_u64_slice, and compare the generated code for view-based and slice-based iteration. Investigate why the view version is not autovectorized; done means the view implementation produces vectorized code comparable to the slice implementation.
Written by the indexing model from the issue text.
Description
I have a, b, c of type Array1<u64>. a is mutable reference, whereas b & c are just reference. I want to set each element in a as product of elements in b & c at corresponding indices. Implementation is relatively straightforward and can be vectorized by compiler. However, I noticed that compiler only vectorizes when I iter using a, b, and c as slices but not as.view().
This is link to both implementations. Notice that nd_mul_u64_view is not vectorized and nd_mul_u64_slice is.
- Dominant language
- Rust
- Stars
- 452
- Forks
- 95
- PR merge metrics
- No merged PRs in 30d
Contributor guide
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- Open a pull request that references the issue number.
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