[PATCH] D57357: [GlobalISel][AArch64] Add instruction selection support for @llvm.log2

[Jessica Paquette via Phabricator via llvm-commits]

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

This teaches GlobalISel to emit a RTLib call for @llvm.log2 when it encounters it.

It updates the existing floating point tests to show that we don't fall back on the intrinsic, and select the correct instructions. It also adds a legalizer test for G_FLOG2.


https://reviews.llvm.org/D57357

Files:
  lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  lib/Target/AArch64/AArch64LegalizerInfo.cpp
  lib/Target/AArch64/AArch64RegisterBankInfo.cpp
  test/CodeGen/AArch64/GlobalISel/legalize-log2.mir
  test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
  test/CodeGen/AArch64/arm64-vfloatintrinsics.ll
  test/CodeGen/AArch64/f16-instructions.ll

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