[PATCH] D113291: [WIP] Add LowerTableBasedCTZ and anable it for AARCH64 in -O3

[Djordje Todorovic via Phabricator via llvm-commits]

djtodoro created this revision.
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This patch introduces a new LLVM Pass that should recognize table-based ctz. It is enabled for AARCH64 only, at the moment. It addresses the [0].

[0] https://bugs.llvm.org/show_bug.cgi?id=46434

TODO: Get the data on SPEC benchmark.

Co-authored-by: @mmatic05, @milica-lazarevic, @dmilosevic141


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113291

Files:
  llvm/include/llvm/InitializePasses.h
  llvm/include/llvm/LinkAllPasses.h
  llvm/include/llvm/Transforms/Scalar.h
  llvm/include/llvm/Transforms/Scalar/LowerTableBasedCTZ.h
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
  llvm/lib/Transforms/Scalar/CMakeLists.txt
  llvm/lib/Transforms/Scalar/LowerTableBasedCTZ.cpp
  llvm/lib/Transforms/Scalar/Scalar.cpp
  llvm/test/CodeGen/AArch64/O3-pipeline.ll
  llvm/test/Transforms/LowerTableBasedCTZ/AARCH64/dereferencing-pointer.ll
  llvm/test/Transforms/LowerTableBasedCTZ/AARCH64/lit.local.cfg
  llvm/test/Transforms/LowerTableBasedCTZ/AARCH64/lower-table-based-ctz-basics.ll
  llvm/test/Transforms/LowerTableBasedCTZ/AARCH64/lower-table-based-ctz.ll

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