[PATCH] D62653: [Mips][DSP] Fix physregs incorrectly marked as dead.

[Mirko Brkusanin via Phabricator via llvm-commits]

mbrkusanin created this revision.
mbrkusanin added reviewers: atanasyan, mstojanovic, sdardis, petarj.
Herald added a subscriber: arichardson.

Some RDDSP and WRDSP operands are added by post-isel target hook which is too 
late. Because of this some of registers used in those operands can be 
incorrectly marked as dead in previous instructions. By keeping track of those 
operands and checking them for later use we can remove correct registers 
incorrectly marked as dead.

We can also remove changes added in rL272647 <https://reviews.llvm.org/rL272647> and removing of dead flags in 
LiveVariable analysis pass.


https://reviews.llvm.org/D62653

Files:
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/LiveVariables.cpp
  lib/CodeGen/MachineInstr.cpp
  lib/CodeGen/SelectionDAG/InstrEmitter.cpp
  lib/CodeGen/SelectionDAG/InstrEmitter.h
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  lib/Target/Mips/MicroMipsDSPInstrInfo.td
  lib/Target/Mips/MipsDSPInstrInfo.td
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.h
  lib/Target/Mips/MipsSEISelDAGToDAG.cpp

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