[all-commits] [llvm/llvm-project] d6e25c: [SelectionDAG] Take passthru into account when wid...

[Min-Yih Hsu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d6e25c4d21ebe20aaa6cbf6e2b9afde8f6713160
      https://github.com/llvm/llvm-project/commit/d6e25c4d21ebe20aaa6cbf6e2b9afde8f6713160
  Author: Min-Yih Hsu <min.hsu at sifive.com>
  Date:   2025-06-14 (Sat, 14 Jun 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-masked-load-int.ll
    M llvm/test/CodeGen/RISCV/rvv/masked-load-int.ll

  Log Message:
  -----------
  [SelectionDAG] Take passthru into account when widening ISD::MLOAD (#144170)

#140595 used vp.load in the cases where we need to widen masked.load.
However, we didn't account for the passthru operand so it might
miscompile when the passthru is not undef. While we can simply avoid
using vp.load to widen when passthru is not undef, doing so will ran
into the exact same crash described in #140198 , so for scalable vector,
this patch manually merges the vp.load result with passthru when the
latter is not undef.



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