llvm / llvm/circt

`sv.namehint` prevents CSE

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Dominant language
C++
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Description

Values with the sv.namehint attribute are not CSE'd due to differences in the attribute. CSE should be adjusted to allow certain attributes to be ignored.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating the CSE implementation and its tests, then inspect how differences in the sv.namehint attribute prevent common subexpression elimination. Determine which attributes are safe to ignore and update the relevant tests; done means eligible values with sv.namehint can be CSE'd without changing other attribute behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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