[PATCH] D37890: [X86] Don't emit COPY_TO_REG to ABCD registers before EXTRACT_SUBREG of sub_8bit

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

This is similar to https://reviews.llvm.org/D37843, but for sub_8bit. This fixes all of the patterns except for the 2 that emit only an EXTRACT_SUBREG. That causes a verifier error with global isel because global isel doesn't know to issue the ABCD when doing this extract on 32-bits targets.


https://reviews.llvm.org/D37890

Files:
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86InstrCompiler.td

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