[PATCH] D119334: [AArch64][SVE] Fold away SETCC if original input was predicate vector.

[Sander de Smalen via Phabricator via llvm-commits]

sdesmalen created this revision.
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This adds the following two folds:

Fold 1:

  setcc_merge_zero(
      all_active, extend(nxvNi1 ...), != splat(0))

-> nxvNi1 ...

Fold 2:

  setcc_merge_zero(
      pred, extend(nxvNi1 ...), != splat(0))

-> nxvNi1 and(pred, ...)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119334

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-cmp-select.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-gather.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-scatter.ll
  llvm/test/CodeGen/AArch64/sve-punpklo-combine.ll
  llvm/test/CodeGen/AArch64/sve-setcc.ll

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