llvm / llvm/circt

[Dedup] Vector of bundles, with different field names should dedup

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FIRRTL
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C++
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Description

Bundles with different field names dedup, but they don't if the bundle is an element of a vector.
The Simple0 and Simple1 should dedup.

firrtl.circuit "Simple" {
  firrtl.module @Simple0() {
    %a = firrtl.wire: !firrtl.vector<bundle<a: uint<1>>, 2>
  }
  firrtl.module @Simple1() {
    %b = firrtl.wire: !firrtl.vector<bundle<b: uint<1>>, 2>
  }
  firrtl.module @Simple() {
    firrtl.instance simple0 @Simple0()
    firrtl.instance simple1 @Simple1()
  }
}

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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 with the FIRRTL reproducer in the issue and trace the deduplication path for vector-of-bundle types. Confirm the behavior using the Simple0 and Simple1 modules; done means those modules deduplicate despite their differing bundle field names.

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
Mostly clear
Newbie friendliness
35/100

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