JuliaDiff / JuliaDiff/ChainRulesCore.jl
Making `getproperty`, `getindex` and `iterate` more type stable for `Tangent`s
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- Dominant language
- Julia
- Stars
- 267
- Forks
- 66
- PR merge metrics
- No merged PRs in 30d
Description
Constprop is rarely able to pierce the function barrier and get through to the underlying type. This would especially help when the backing is a tuple or NamedTuple.
I think the main question is how to do this. @inline as seen in https://github.com/JuliaLang/julia/blob/master/base/tuple.jl is one option. Base.@constprop :aggressive is another that Diffractor currently employs.
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 locating the Tangent implementations of getproperty, getindex, and iterate, then compare how tuple.jl uses @inline with how Diffractor uses Base.@constprop :aggressive. Confirm that the chosen approach preserves type stability for tuple and NamedTuple backings; done means these operations can specialize through the function barrier.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- performance
- Issue type
- Refactor
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100