[PATCH] D80969: [AArch64][GlobalISel] Select zip1 and zip2

[Jessica Paquette via Phabricator via llvm-commits]

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

Port the code to recognize a zip1/zip2 shuffle mask from AArch64ISelLowering and put it into the post-legalizer combiner.

Add G_ZIP1 and G_ZIP2 to AArch64InstrGISel.td and hook them up as equivalent nodes to AArch64zip1 and AArch64zip2. By doing this, we can select them without having to actually write any code in the selector. This same approach should work for several other instructions handled in `AArch64TargetLowering::LowerVECTOR_SHUFFLE`.

Minor code size improvements for SPECINT2000 at -O3 on 197.parser, 252.eon, and 186.crafty.


https://reviews.llvm.org/D80969

Files:
  llvm/lib/Target/AArch64/AArch64Combine.td
  llvm/lib/Target/AArch64/AArch64InstrGISel.td
  llvm/lib/Target/AArch64/AArch64PostLegalizerCombiner.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-combiner-zip.mir
  llvm/test/CodeGen/AArch64/GlobalISel/select-zip.mir

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