[PATCH] D118147: [AArch64][SVE] Folds VSELECT if the predicate is all active.

[Sander de Smalen via Phabricator via llvm-commits]

sdesmalen created this revision.
sdesmalen added reviewers: david-arm, DavidTruby, bsmith.
Herald added subscribers: psnobl, hiraditya, kristof.beyls, tschuett.
Herald added a reviewer: efriedma.
sdesmalen requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This adds the following changes:

- Fold: vselect(<all active predicate>, x, y) => x
- Extend isAllActivePredicate to take vscale_range into account, e.g. isAllActivePredicate(vl16) for nxv16i1 and vscale == 1 => true. isAllActivePredicate(vl32) for nxv16i1 and vscale == 2 => true.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118147

Files:
  llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/test/CodeGen/AArch64/sve-vselect-fold.ll

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