[PATCH] D37843: [X86] Don't emit COPY_TO_REG to ABCD registers before EXTRACT_SUBREG of sub_8bit_hi

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

I'm pretty sure that InstrEmitter::EmitSubregNode will take care of this itself by calling ConstrainForSubReg which in turn calls TRI->getSubClassWithSubReg.

I think Jakob Stoklund Olesen alluded to this in his commit message for r141207 which added the code to EmitSubregNode.

I want to do the same to the sub_8bit patterns too, but I hit a global isel failure.


https://reviews.llvm.org/D37843

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86InstrCompiler.td

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