diff --git a/llvm/include/llvm/CodeGen/BasicTTIImpl.h b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
--- a/llvm/include/llvm/CodeGen/BasicTTIImpl.h
+++ b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
@@ -2087,7 +2087,7 @@
     return RedCost + MulCost + ExtCost;
   }
 
-  unsigned getVectorSplitCost() { return 1; }
+  InstructionCost getVectorSplitCost() { return 1; }
 
   /// @}
 };
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
@@ -197,7 +197,7 @@
       std::function<void(Instruction *, unsigned, APInt, APInt &)>
           SimplifyAndSetOp) const;
 
-  unsigned getVectorSplitCost() { return 0; }
+  InstructionCost getVectorSplitCost() { return 0; }
 
   InstructionCost getShuffleCost(TTI::ShuffleKind Kind, VectorType *Tp,
                                  ArrayRef<int> Mask, int Index,