[llvm] [VPlan] Don't fold live ins with both scalar and vector operands (PR #154067)

[Florian Hahn via llvm-commits]

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@@ -976,14 +976,9 @@ static Value *tryToFoldLiveIns(const VPRecipeBase &R, unsigned Opcode,
                           RFlags.getGEPNoWrapFlags());
   }
   case VPInstruction::PtrAdd:
-  case VPInstruction::WidePtrAdd:
     return Folder.FoldGEP(IntegerType::getInt8Ty(TypeInfo.getContext()), Ops[0],
                           Ops[1],
                           cast<VPRecipeWithIRFlags>(R).getGEPNoWrapFlags());
-  case Instruction::InsertElement:
-    return Folder.FoldInsertElement(Ops[0], Ops[1], Ops[2]);
-  case Instruction::ExtractElement:
-    return Folder.FoldExtractElement(Ops[0], Ops[1]);
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fhahn wrote:

Right, so extracting any lane will return the live-in operand, which we can do w/o calling the folder, together with comment for why we are not calling the folder

https://github.com/llvm/llvm-project/pull/154067