[PATCH] D156331: RegisterCoalescer: Handle implicit-def of a super register when rematerializing

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: qcolombet, MatzeB, kparzysz, craig.topper, RKSimon, lhames, bogner.
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Permit an implicit-def of a virtual register when rematerializing if
it defines a super register of a subregister def. The
rematerialization pre-legality check should really have been checking
the implicit operands, but that should be fixed separately.


https://reviews.llvm.org/D156331

Files:
  llvm/lib/CodeGen/RegisterCoalescer.cpp
  llvm/test/CodeGen/X86/rematerialize-sub-super-reg.mir

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