[PATCH] D51350: CodeGen: Make computeRegisterLiveness search forward first

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: MatzeB.
Herald added subscribers: nhaehnle, wdng, jvesely.

If there is an unused def, this would previously
report that the register was live. Check for uses
first so that it is reported as dead if never used.


https://reviews.llvm.org/D51350

Files:
  lib/CodeGen/MachineBasicBlock.cpp
  test/CodeGen/AMDGPU/fold-immediate-operand-shrink.mir
  test/CodeGen/Thumb/frame-access.ll

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