[all-commits] [llvm/llvm-project] e21720: [VPlan] Mark default value or ExtractLastActive as...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e217205575ac65acd6d301b036bea8875f5eaa16
      https://github.com/llvm/llvm-project/commit/e217205575ac65acd6d301b036bea8875f5eaa16
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-26 (Sat, 26 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-scalar-assignment-fold-tail.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-scalar-assignment.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/conditional-scalar-assignment-fold-tail.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/conditional-scalar-assignment.ll
    M llvm/test/Transforms/LoopVectorize/X86/conditional-scalar-assignment.ll
    M llvm/test/Transforms/LoopVectorize/find-last-ptr-induction.ll
    M llvm/test/Transforms/LoopVectorize/iv-select-cmp-non-const-iv-start.ll
    M llvm/test/Transforms/LoopVectorize/iv-select-cmp-trunc.ll
    M llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll

  Log Message:
  -----------
  [VPlan] Mark default value or ExtractLastActive as only first lane used. (#226153)

The default value (operand 0) of ExtractLastActive is the scalar value
of @llvm.experimental.vector.extract.last.active. Only the first lane is
used, mark accordingly.

PR: https://github.com/llvm/llvm-project/pull/226153



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