[PATCH] D51849: [RegisterCoalescer] Avoid "Use not jointly dominated by defs" in removePartialRedundancy

[Tim Renouf via Phabricator via llvm-commits]

tpr created this revision.
Herald added subscribers: llvm-commits, nhaehnle, jvesely, qcolombet, MatzeB.

removePartialRedundancy was using extendToIndices on each subrange
without passing in an Undefs vector containing main reg defs that are
undef in the subrange, causing the above assert.

Unfortunately I can only reproduce this in an ll test. Turning it into a
mir test makes the problem go away.

Change-Id: I4f3ba2afb20d79f9467afb3d882f0328d38531be


Repository:
  rL LLVM

https://reviews.llvm.org/D51849

Files:
  lib/CodeGen/RegisterCoalescer.cpp
  test/CodeGen/AMDGPU/regcoal-removepartial-redundancy-not-jointly-dominated.ll

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