[PATCH] [AArch64] Generate CMN when comparing a short int with minus

[Xu Jiangwei]

Comments about fundamental property are added in the patch.

Please have a look.

David

http://reviews.llvm.org/D4966

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/cmpwithshort.ll
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