[PATCH] D128384: llvm-reduce: Add reduction for custom register masks

[Matt Arsenault via Phabricator via llvm-commits]

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I have a register allocator failure that only reproduces with IPRA
enabled, and requires the specific regmask if I want to only run the
one relevant pass. The printed custom regmask is enormous and I would
like to reduce it.

      

This reduces each individual bit in the mask, but it would probably be
better to start at register units and clear all aliasing fields at a
time. This would require stricter verification that all aliasing bits
are set in regmasks (although I would prefer to switch regmasks to use
register units in the first place).


https://reviews.llvm.org/D128384

Files:
  llvm/test/tools/llvm-reduce/mir/reduce-register-masks.mir
  llvm/tools/llvm-reduce/CMakeLists.txt
  llvm/tools/llvm-reduce/DeltaManager.cpp
  llvm/tools/llvm-reduce/ReducerWorkItem.cpp
  llvm/tools/llvm-reduce/deltas/ReduceRegisterMasks.cpp
  llvm/tools/llvm-reduce/deltas/ReduceRegisterMasks.h

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