[all-commits] [llvm/llvm-project] 40a72f: [VPlan] Support extracting any lane of uniform value.

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 40a72f8cc414726a8be234a260650fd62354da21
      https://github.com/llvm/llvm-project/commit/40a72f8cc414726a8be234a260650fd62354da21
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-06-14 (Fri, 14 Jun 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/reduction-recurrence-costs-sve.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-chains.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-multiply-recurrences.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll

  Log Message:
  -----------
  [VPlan] Support extracting any lane of uniform value.

If the value we are extracting a lane from is uniform, only the first
lane will be set. Return lane 0 for any requested lane.

This fixes a crash when trying to extract the last lane for a
first-order recurrence resume value.

Fixes https://github.com/llvm/llvm-project/issues/95520.



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