[PATCH] D48555: Account for undef values from predecessors in extendSegmentsToUses

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz created this revision.
kparzysz added reviewers: MatzeB, tpr, dstuttard.
Herald added a subscriber: nhaehnle.

It is legal for a PHI node not to have a live value in a predecessor as long as the end of the predecessor is jointly dominated by an undef value.


Repository:
  rL LLVM

https://reviews.llvm.org/D48555

Files:
  include/llvm/CodeGen/LiveIntervals.h
  lib/CodeGen/LiveIntervals.cpp
  lib/CodeGen/LiveRangeCalc.cpp
  lib/CodeGen/LiveRangeCalc.h
  test/CodeGen/AMDGPU/subreg-split-live-in-error.mir

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