diff --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -3238,8 +3238,8 @@
     return false;
 
   // Get the size of the types in bits, we'll need this later
-  unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
-  unsigned DstBitSize = DstTy->getScalarSizeInBits();
+  TypeSize SrcBitSize = SrcTy->getPrimitiveSizeInBits();
+  TypeSize DstBitSize = DstTy->getPrimitiveSizeInBits();
 
   // If these are vector types, get the lengths of the vectors (using zero for
   // scalar types means that checking that vector lengths match also checks that