[all-commits] [llvm/llvm-project] 419738: [LLVM][SelectionDAG] Remove scalable vector restri...

[Paul Walker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4197386dbde3a59e6b3133604b7a0ae10eb4ed74
      https://github.com/llvm/llvm-project/commit/4197386dbde3a59e6b3133604b7a0ae10eb4ed74
  Author: Paul Walker <paul.walker at arm.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/AArch64/complex-deinterleaving-reductions-predicated-scalable.ll
    M llvm/test/CodeGen/AArch64/intrinsic-cttz-elts-sve.ll
    M llvm/test/CodeGen/AArch64/sve-fcmp.ll
    M llvm/test/CodeGen/AArch64/sve-fp-int-min-max.ll
    M llvm/test/CodeGen/RISCV/rvv/vwadd-sdnode.ll

  Log Message:
  -----------
  [LLVM][SelectionDAG] Remove scalable vector restriction from poison analysis. (#102504)

The following functions have an early exit for scalable vectors:
  SelectionDAG::canCreateUndefOrPoison
  SelectionDAG:isGuaranteedNotToBeUndefOrPoison
    
The implementations of these don't look to be sensitive to the
vector type other than some uses of demanded elts analysis that
doesn't fully support scalable types.  That said the initial
calculation demands all elements and so I've followed the same
scheme as used by TargetLowering::SimplifyDemandedBits.



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