[all-commits] [llvm/llvm-project] ccbceb: [LoongArch] Fix implicit PesudoXVINSGR2VR error (#...

[tangaac via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ccbcebcfd3c0db5e6686aff292f128dcd1f56bc8
      https://github.com/llvm/llvm-project/commit/ccbcebcfd3c0db5e6686aff292f128dcd1f56bc8
  Author: tangaac <tangyan01 at loongson.cn>
  Date:   2025-08-19 (Tue, 19 Aug 2025)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/test/CodeGen/LoongArch/lasx/build-vector.ll
    M llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insert-extract-element.ll
    M llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insertelement.ll

  Log Message:
  -----------
  [LoongArch] Fix implicit PesudoXVINSGR2VR error (#152432)

According to the instructions manual, when `vr0` is changed, high 128
bit of `xr0` is undefined.
Use `vinsgr2vr.b/h` to insert an `i8/i16` to low 128bit of a 256 vector
may cause undefined behavior when high 128bit is used in later
instructions.



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