[PATCH] D19800: [PR27599] [SystemZ] [SelectionDAG] Fix extension of atomic cmpxchg result.

[Marcin Kościelnicki via llvm-commits]

koriakin created this revision.
koriakin added reviewers: uweigand, resistor.
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Currently, SelectionDAG assumes 8/16-bit cmpxchg returns either a sign
extended result, or a zero extended result.  SystemZ takes a third
option by returning junk in the high bits (rotated contents of the other
bytes in the memory word).  In that case, don't use Assert*ext, and
zero-extend the result ourselves if a comparison is needed.

Repository:
  rL LLVM

http://reviews.llvm.org/D19800

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/Target/Mips/MipsISelLowering.h
  lib/Target/SystemZ/SystemZISelLowering.h
  test/CodeGen/SystemZ/cmpxchg-05.ll

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