[PATCH] D58155: [GlobalISel][AArch64] Legalize + select some llvm.ctlz.* intrinsics

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added a reviewer: aemerson.
Herald added subscribers: Petar.Avramovic, kristof.beyls, javed.absar, rovka.

Legalize/select llvm.ctlz.* for types that the importer can grab easily.

Add select-ctlz to show that we actually select them. Update arm64-clrsb.ll and arm64-vclz.ll to show that we perform valid transformations in optimized builds, and document where GISel can improve.


https://reviews.llvm.org/D58155

Files:
  lib/Target/AArch64/AArch64LegalizerInfo.cpp
  test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
  test/CodeGen/AArch64/GlobalISel/select-ctlz.mir
  test/CodeGen/AArch64/arm64-clrsb.ll
  test/CodeGen/AArch64/arm64-vclz.ll

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