[PATCH] D159283: Add intrinsic to count trailing zero elements in a vector

[Kerry McLaughlin via Phabricator via llvm-commits]

kmclaughlin updated this revision to Diff 557880.
kmclaughlin marked 3 inline comments as done.
kmclaughlin added a comment.

- Changed the second argument of the `@llvm.experimental.cttz.elts` intrinsic to an i1.
- Added an AArch64ISD node, `CTTZ_ELTS`, which is used in when lowering the intrinsic for AArch64 if `shouldExpandCttzElements` returned true.
- Changed the generic lowering to no longer check if the result is 0 and return undef if zero-is-poison is set.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D159283/new/

https://reviews.llvm.org/D159283

Files:
  llvm/docs/LangRef.rst
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/IR/Intrinsics.td
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
  llvm/test/CodeGen/AArch64/intrinsic-cttz-elts-sve.ll
  llvm/test/CodeGen/AArch64/intrinsic-cttz-elts.ll
  llvm/test/CodeGen/RISCV/intrinsic-cttz-elts-vscale.ll
  llvm/test/CodeGen/RISCV/intrinsic-cttz-elts.ll
  llvm/test/CodeGen/X86/intrinsic-cttz-elts.ll

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