[PATCH] D81992: [AArch64][GlobalISel] Make G_SEXT_INREG legal and add selection support.

[Amara Emerson via Phabricator via llvm-commits]

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

We were defaulting to the lower action for this, resulting in SHL+ASHR sequences. On AArch64 we can do this in one instruction for an arbitrary extension using SBFM as we do for G_SEXT.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D81992

Files:
  llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-div.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-ext.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-itofp.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-ptr-add.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-rem.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-sext.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-shift.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-undef.mir

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