Merge commit '8eb4ada181dc' from llvm.org/main into next

Author: git apple-llvm automerger

llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

@@ -2297,9 +2297,12 @@ InstructionCost RISCVTTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val,
       Index = Index % M1Max;
     }
 
-    // We could extract/insert the first element without vslidedown/vslideup.
     if (Index == 0)
+      // We can extract/insert the first element without vslidedown/vslideup.
       SlideCost = 0;
+    else if (ST->hasVendorXRivosVisni() && isUInt<5>(Index) &&
+             Val->getScalarType()->isIntegerTy())
+      SlideCost = 0; // With ri.vinsert/ri.vextract there is no slide needed
     else if (Opcode == Instruction::InsertElement)
       SlideCost = 1; // With a constant index, we do not need to use addi.
   }