[PATCH] D23253: [X86] Generalized transformation of `definstr gr8; movzx gr32, gr8` to `xor gr32, gr32; definstr gr8`

[bryant via llvm-commits]

bryant updated this revision to Diff 67980.
bryant added a comment.
Herald added a subscriber: qcolombet.

- Rely on RAII to clean up unused `MOV32r0`
- Outsource register allocation hints to `VirtRegAuxInfo::copyHint`
- Add regmask constraints if no hints are found


Repository:
  rL LLVM

https://reviews.llvm.org/D23253

Files:
  include/llvm/CodeGen/CalcSpillWeights.h
  lib/CodeGen/CalcSpillWeights.cpp
  lib/Target/X86/CMakeLists.txt
  lib/Target/X86/X86.h
  lib/Target/X86/X86FixupZExt.cpp
  lib/Target/X86/X86TargetMachine.cpp

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