[PATCH] D137631: AArch64: implement canonical `!isnan(...)` with single compare.

[Tim Northover via Phabricator via llvm-commits]

t.p.northover created this revision.
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LLVM canonicalizes a check for whether a number is NaN or not to `fcmp ord %in, zeroinitializer`. An `ord` check normally needs to be lowered to two separate comparisons on AArch64 but in this case it's equivalent to `fcmp oeq %in, %in` which we have a single `fcmeq` instruction for.


https://reviews.llvm.org/D137631

Files:
  llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/lower-neon-vector-fcmp.mir
  llvm/test/CodeGen/AArch64/neon-compare-instructions.ll

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