[HW] Remove dead HierPathOp's
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- Dominant language
- C++
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Description
These were previously bulk removed during lowering, but now that they're HW operations (and useful) we can end up with thousands of dead hierpath's on a modest design without a way to remove them.
Moving/supporting InnerSymDCE in HW, as well as running mlir's SymbolDCE would be one way to address this and would perhaps remove any that became dead during the HW pipeline.
Running those passes (particularly SymbolDCE) immediately before Lowering would at least remove the ones trivially dead and could be done today (not free, but), untested if this would address the many dead hierpath's I'm seeing.
I don't know if this is problematic as-is but these have blocked DCE and similar before.
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First steps
- Read the whole issue, then the project's contributing guide.
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Research direction
The issue names no files or tests. Start by locating HW HierPathOp handling and the lowering pipeline, then investigate InnerSymDCE and MLIR's SymbolDCE before lowering. Done means dead HierPathOps are removed without blocking DCE or similar passes.
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
- 35/100