[PATCH] D101782: [AArch64][GlobalISel] Add post-legalizer lowering for NEON vector fcmps

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added a reviewer: aemerson.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
paquette requested review of this revision.
Herald added a project: LLVM.

This is roughly equivalent to the floating point portion of `AArch64TargetLowering::LowerVSETCC`. Main part that's missing is the v4s16 bit.

This also adds helpers equivalent to `EmitVectorComparison`, and `changeVectorFPCCToAArch64CC`. This moves `changeFCMPPredToAArch64CC` out of the selector into AArch64GlobalISelUtils for the sake of code reuse.

This is done in post-legalizer lowering with pseudos to simplify selection. The imported patterns end up handling selection for us this way.


https://reviews.llvm.org/D101782

Files:
  llvm/lib/Target/AArch64/AArch64Combine.td
  llvm/lib/Target/AArch64/AArch64InstrGISel.td
  llvm/lib/Target/AArch64/GISel/AArch64GlobalISelUtils.cpp
  llvm/lib/Target/AArch64/GISel/AArch64GlobalISelUtils.h
  llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
  llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/lower-neon-vector-fcmp.mir
  llvm/test/CodeGen/AArch64/GlobalISel/select-neon-vector-fcmp.mir
  llvm/test/CodeGen/AArch64/neon-compare-instructions.ll

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