[all-commits] [llvm/llvm-project] 62c983: [LegalizeTypes] Fix incorrect EVL1 clip in SplitVe...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 62c9839e109fa53c0cd52cddb4f28d415a5e7f74
      https://github.com/llvm/llvm-project/commit/62c9839e109fa53c0cd52cddb4f28d415a5e7f74
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2026-06-23 (Tue, 23 Jun 2026)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/test/CodeGen/RISCV/rvv/vp-splice-mask-vectors.ll
    M llvm/test/CodeGen/RISCV/rvv/vp-splice.ll

  Log Message:
  -----------
  [LegalizeTypes] Fix incorrect EVL1 clip in SplitVecRes_VP_SPLICE. (#205021)

We were incorrectly clipping EVL1 to be a valid index for the VT, in the
range [0, VT.getNumVectorElements() - 1]. It is legal for EVL1 to be
equal to VT.getNumVectorElements() here so that was incorrect.

In case it isn't clear, the clip is necessary to prevent turning poison
into UB by accessing outside the temporary stack object.



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