[all-commits] [llvm/llvm-project] 03e675: [ARM] Turn pred_cast(xor(x, -1)) into xor(pred_cas...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 03e675fd128bed754454fc176357ad0ec6660c47
      https://github.com/llvm/llvm-project/commit/03e675fd128bed754454fc176357ad0ec6660c47
  Author: David Green <david.green at arm.com>
  Date:   2020-12-08 (Tue, 08 Dec 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/test/CodeGen/Thumb2/mve-pred-constfold.ll

  Log Message:
  -----------
  [ARM] Turn pred_cast(xor(x, -1)) into xor(pred_cast(x), -1)

This folds a not (an xor -1) though a predicate_cast, so that it can be
turned into a VPNOT and potentially be folded away as an else predicate
inside a VPT block.

Differential Revision: https://reviews.llvm.org/D92235