llvm / llvm/circt

[SV][HW] Introduce hw::HWFunctionType and use it for Sim/SV function ops

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Description

Currently Sim/SV function operation uses HWModuleType as a type representation but it doesn't capture an explicit return value type.

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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 tracing the Sim/SV function-operation code paths that currently use HWModuleType. Define the scope of HWFunctionType and update those uses so function operations represent an explicit return value type; done means the affected Sim/SV operations consistently use the new representation.

Written by the indexing model from the issue text.

Assessment

Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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