[PATCH] D92470: [ARM] Common inverse constant predicates to VPNOT

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, samtebbs, simon_tatham, efriedma, ostannard.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
dmgreen requested review of this revision.

This scans through blocks looking for constants used as predicates in MVE instructions. When two constants are found which are the inverse of one another, the second can be replaced by a VPNOT of the first, potentially allowing that not to be folded away into an else predicate of a vpt block.


https://reviews.llvm.org/D92470

Files:
  llvm/lib/Target/ARM/MVEVPTOptimisationsPass.cpp
  llvm/test/CodeGen/Thumb2/mve-pred-constfold.ll
  llvm/test/CodeGen/Thumb2/mve-vpt-optimisations.mir

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