[PATCH] D35073: [RegisterCoalescer] Fix for subrange join unreachable

[David Stuttard via Phabricator via llvm-commits]

dstuttard updated this revision to Diff 129060.
dstuttard added a comment.

A better fix for this problem.

The original fix chose an arbitrary other subreg to return in the case where the
subreg was actually not defined - this isn't ideal as this can sometimes lead
to matching something different and causing an assert.

Fix now updated to allow for undefined sub-registers (they are ignored if they
are undefined)


https://reviews.llvm.org/D35073

Files:
  lib/CodeGen/RegisterCoalescer.cpp
  test/CodeGen/AMDGPU/regcoalesce-subregjoin-fullcopy.mir

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