[llvm] [LoongArch] Adds support for vectors in OptWInstrs (PR #118935)

[via llvm-commits]

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@@ -167,18 +166,45 @@ static bool hasAllNBitUsers(const MachineInstr &OrigMI,
       case LoongArch::MOVGR2FCSR:
       case LoongArch::MOVGR2FRH_W:
       case LoongArch::MOVGR2FR_W_64:
+      case LoongArch::VINSGR2VR_W:
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heiher wrote:

I've added test cases for the `vreplgr2vr.w` instruction. For vector instructions, effective optimizations often arise in cases involving complex multi-level data flow relationships.  I plan to add more test cases in the future if I identify opportunities for further simplification.

https://github.com/llvm/llvm-project/pull/118935