[all-commits] [llvm/llvm-project] 68210c: [VPlan] Only generate first lane for VPPredInstPHI...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 68210c7c269b7b7325dedaea7cea9fe9d979fab5
      https://github.com/llvm/llvm-project/commit/68210c7c269b7b7325dedaea7cea9fe9d979fab5
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-10-05 (Sat, 05 Oct 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/X86/divs-with-tail-folding.ll
    M llvm/test/Transforms/LoopVectorize/X86/drop-poison-generating-flags.ll
    A llvm/test/Transforms/LoopVectorize/X86/replicate-recipe-with-only-first-lane-used.ll

  Log Message:
  -----------
  [VPlan] Only generate first lane for VPPredInstPHI if no others used.

IF only the first lane of the result is used, only generate the first
lane.

Fixes https://github.com/llvm/llvm-project/issues/111042.



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