[all-commits] [llvm/llvm-project] 67d840: [VPlan] Relax over-aggressive assertion in VPTrans...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67d840b60fbd75ca1b52d77bd3353771ec853735
      https://github.com/llvm/llvm-project/commit/67d840b60fbd75ca1b52d77bd3353771ec853735
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-05-14 (Tue, 14 May 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    A llvm/test/Transforms/LoopVectorize/X86/widened-value-used-as-scalar-and-first-lane.ll

  Log Message:
  -----------
  [VPlan] Relax over-aggressive assertion in VPTransformState::get().

There are cases where a vector value has some users that demand the
the single scalar value only (NeedsScalar), while other users demand the
vector value (see attached test cases). In those cases, the NeedsScalar
users should only demand the first lane.

Fixes https://github.com/llvm/llvm-project/issues/91883.



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