[PATCH] D23484: Rough proposal for an alternative way to recompute subreg liveness while respecting undef-read-defs

[Matthias Braun via llvm-commits]

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This is a rough patch on how I think liveness calculation for subregs that respects undef-read-defs should look like.

This is an unfinished patch, meant to move the discussion in D21189 forward (it is also based on this patch).

Repository:
  rL LLVM

https://reviews.llvm.org/D23484

Files:
  include/llvm/CodeGen/LiveInterval.h
  include/llvm/CodeGen/LiveIntervalAnalysis.h
  lib/CodeGen/LiveInterval.cpp
  lib/CodeGen/LiveIntervalAnalysis.cpp
  lib/CodeGen/LiveRangeCalc.cpp
  lib/CodeGen/LiveRangeCalc.h
  lib/CodeGen/RegisterCoalescer.cpp
  lib/CodeGen/RenameIndependentSubregs.cpp
  lib/CodeGen/SplitKit.cpp

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