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
@@ -3022,8 +3022,8 @@
          "Invalid cast");
   assert(Ty->isVectorTy() == S->getType()->isVectorTy() && "Invalid cast");
   assert((!Ty->isVectorTy() ||
-          cast<FixedVectorType>(Ty)->getNumElements() ==
-              cast<FixedVectorType>(S->getType())->getNumElements()) &&
+          cast<VectorType>(Ty)->getElementCount() ==
+              cast<VectorType>(S->getType())->getElementCount()) &&
          "Invalid cast");
 
   if (Ty->isIntOrIntVectorTy())
@@ -3041,8 +3041,8 @@
          "Invalid cast");
   assert(Ty->isVectorTy() == S->getType()->isVectorTy() && "Invalid cast");
   assert((!Ty->isVectorTy() ||
-          cast<FixedVectorType>(Ty)->getNumElements() ==
-              cast<FixedVectorType>(S->getType())->getNumElements()) &&
+          cast<VectorType>(Ty)->getElementCount() ==
+              cast<VectorType>(S->getType())->getElementCount()) &&
          "Invalid cast");
 
   if (Ty->isIntOrIntVectorTy())
diff --git a/llvm/unittests/IR/InstructionsTest.cpp b/llvm/unittests/IR/InstructionsTest.cpp
--- a/llvm/unittests/IR/InstructionsTest.cpp
+++ b/llvm/unittests/IR/InstructionsTest.cpp
@@ -368,11 +368,19 @@
   Constant *NullV2I32Ptr = Constant::getNullValue(V2Int32PtrTy);
   auto Inst1 = CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty, "foo", BB);
 
+  Constant *NullVScaleV2I32Ptr = Constant::getNullValue(VScaleV2Int32PtrTy);
+  auto Inst1VScale = CastInst::CreatePointerCast(
+      NullVScaleV2I32Ptr, VScaleV2Int32Ty, "foo.vscale", BB);
+
   // Second form
   auto Inst2 = CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty);
+  auto Inst2VScale =
+      CastInst::CreatePointerCast(NullVScaleV2I32Ptr, VScaleV2Int32Ty);
 
   delete Inst2;
+  delete Inst2VScale;
   Inst1->eraseFromParent();
+  Inst1VScale->eraseFromParent();
   delete BB;
 }