[PATCH] D100908: [AArch64][GlobalISel] Legalize narrow type G_CTPOPs

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added reviewers: aemerson, jroelofs, t.p.northover.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
paquette requested review of this revision.
Herald added a project: LLVM.

Using `clampScalar` here because we ought to mark s128 as custom eventually.

(Right now, it will just fall back.)

With this legalization, we get the same code as SDAG: https://godbolt.org/z/TneoPKrKG


https://reviews.llvm.org/D100908

Files:
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-ctpop.mir
  llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir

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