diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
@@ -1705,7 +1705,7 @@
 
   if (C->getType()->isVectorTy()) {
     // Check each element of a constant vector.
-    unsigned NumElts = cast<VectorType>(C->getType())->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(C->getType())->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = C->getAggregateElement(i);
       if (!Elt)
@@ -2198,7 +2198,7 @@
 
 /// If all elements of two constant vectors are 0/-1 and inverses, return true.
 static bool areInverseVectorBitmasks(Constant *C1, Constant *C2) {
-  unsigned NumElts = cast<VectorType>(C1->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(C1->getType())->getNumElements();
   for (unsigned i = 0; i != NumElts; ++i) {
     Constant *EltC1 = C1->getAggregateElement(i);
     Constant *EltC2 = C2->getAggregateElement(i);
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -377,7 +377,7 @@
   auto VT = cast<VectorType>(Vec->getType());
   auto SVT = VT->getElementType();
   auto AmtVT = Amt->getType();
-  unsigned VWidth = VT->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(VT)->getNumElements();
   unsigned BitWidth = SVT->getPrimitiveSizeInBits();
 
   // If the shift amount is guaranteed to be in-range we can replace it with a
@@ -407,7 +407,7 @@
     assert(AmtVT->isVectorTy() && AmtVT->getPrimitiveSizeInBits() == 128 &&
            cast<VectorType>(AmtVT)->getElementType() == SVT &&
            "Unexpected shift-by-scalar type");
-    unsigned NumAmtElts = cast<VectorType>(AmtVT)->getNumElements();
+    unsigned NumAmtElts = cast<FixedVectorType>(AmtVT)->getNumElements();
     APInt DemandedLower = APInt::getOneBitSet(NumAmtElts, 0);
     APInt DemandedUpper = APInt::getBitsSet(NumAmtElts, 1, NumAmtElts / 2);
     KnownBits KnownLowerBits = llvm::computeKnownBits(
@@ -524,7 +524,7 @@
   auto Amt = II.getArgOperand(1);
   auto VT = cast<VectorType>(II.getType());
   auto SVT = VT->getElementType();
-  int NumElts = VT->getNumElements();
+  int NumElts = cast<FixedVectorType>(VT)->getNumElements();
   int BitWidth = SVT->getIntegerBitWidth();
 
   // If the shift amount is guaranteed to be in-range we can replace it with a
@@ -620,10 +620,10 @@
   if (isa<UndefValue>(Arg0) && isa<UndefValue>(Arg1))
     return UndefValue::get(ResTy);
 
-  auto *ArgTy = cast<VectorType>(Arg0->getType());
+  auto *ArgTy = cast<FixedVectorType>(Arg0->getType());
   unsigned NumLanes = ResTy->getPrimitiveSizeInBits() / 128;
   unsigned NumSrcElts = ArgTy->getNumElements();
-  assert(cast<VectorType>(ResTy)->getNumElements() == (2 * NumSrcElts) &&
+  assert(cast<FixedVectorType>(ResTy)->getNumElements() == (2 * NumSrcElts) &&
          "Unexpected packing types");
 
   unsigned NumSrcEltsPerLane = NumSrcElts / NumLanes;
@@ -695,7 +695,7 @@
   // %cmp = icmp slt <16 x i8> %x, zeroinitializer
   // %int = bitcast <16 x i1> %cmp to i16
   // %res = zext i16 %int to i32
-  unsigned NumElts = ArgTy->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(ArgTy)->getNumElements();
   Type *IntegerVecTy = VectorType::getInteger(ArgTy);
   Type *IntegerTy = Builder.getIntNTy(NumElts);
 
@@ -739,7 +739,7 @@
   if (!CInt)
     return nullptr;
 
-  VectorType *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   assert(VecTy->getNumElements() == 4 && "insertps with wrong vector type");
 
   // The immediate permute control byte looks like this:
@@ -982,7 +982,7 @@
   if (!V)
     return nullptr;
 
-  auto *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   unsigned NumElts = VecTy->getNumElements();
   assert((NumElts == 16 || NumElts == 32 || NumElts == 64) &&
          "Unexpected number of elements in shuffle mask!");
@@ -1027,7 +1027,7 @@
   if (!V)
     return nullptr;
 
-  auto *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   unsigned NumElts = VecTy->getNumElements();
   bool IsPD = VecTy->getScalarType()->isDoubleTy();
   unsigned NumLaneElts = IsPD ? 2 : 4;
@@ -1075,7 +1075,7 @@
   if (!V)
     return nullptr;
 
-  auto *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   unsigned Size = VecTy->getNumElements();
   assert((Size == 4 || Size == 8 || Size == 16 || Size == 32 || Size == 64) &&
          "Unexpected shuffle mask size");
@@ -1468,7 +1468,7 @@
   if (!C)
     return nullptr;
 
-  auto *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   unsigned NumElts = VecTy->getNumElements();
 
   // Only perform this transformation for <8 x i8> vector types.
@@ -2677,7 +2677,7 @@
     // These intrinsics only demand the 0th element of their input vectors. If
     // we can simplify the input based on that, do so now.
     Value *Arg = II->getArgOperand(0);
-    unsigned VWidth = cast<VectorType>(Arg->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(Arg->getType())->getNumElements();
     if (Value *V = SimplifyDemandedVectorEltsLow(Arg, VWidth, 1))
       return replaceOperand(*II, 0, V);
     break;
@@ -2727,7 +2727,7 @@
     bool MadeChange = false;
     Value *Arg0 = II->getArgOperand(0);
     Value *Arg1 = II->getArgOperand(1);
-    unsigned VWidth = cast<VectorType>(Arg0->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(Arg0->getType())->getNumElements();
     if (Value *V = SimplifyDemandedVectorEltsLow(Arg0, VWidth, 1)) {
       replaceOperand(*II, 0, V);
       MadeChange = true;
@@ -2946,7 +2946,7 @@
     Value *Arg1 = II->getArgOperand(1);
     assert(Arg1->getType()->getPrimitiveSizeInBits() == 128 &&
            "Unexpected packed shift size");
-    unsigned VWidth = cast<VectorType>(Arg1->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(Arg1->getType())->getNumElements();
 
     if (Value *V = SimplifyDemandedVectorEltsLow(Arg1, VWidth, VWidth / 2))
       return replaceOperand(*II, 1, V);
@@ -3013,7 +3013,8 @@
       bool MadeChange = false;
       Value *Arg0 = II->getArgOperand(0);
       Value *Arg1 = II->getArgOperand(1);
-      unsigned VWidth = cast<VectorType>(Arg0->getType())->getNumElements();
+      unsigned VWidth =
+          cast<FixedVectorType>(Arg0->getType())->getNumElements();
 
       APInt UndefElts1(VWidth, 0);
       APInt DemandedElts1 = APInt::getSplat(VWidth,
@@ -3053,8 +3054,8 @@
   case Intrinsic::x86_sse4a_extrq: {
     Value *Op0 = II->getArgOperand(0);
     Value *Op1 = II->getArgOperand(1);
-    unsigned VWidth0 = cast<VectorType>(Op0->getType())->getNumElements();
-    unsigned VWidth1 = cast<VectorType>(Op1->getType())->getNumElements();
+    unsigned VWidth0 = cast<FixedVectorType>(Op0->getType())->getNumElements();
+    unsigned VWidth1 = cast<FixedVectorType>(Op1->getType())->getNumElements();
     assert(Op0->getType()->getPrimitiveSizeInBits() == 128 &&
            Op1->getType()->getPrimitiveSizeInBits() == 128 && VWidth0 == 2 &&
            VWidth1 == 16 && "Unexpected operand sizes");
@@ -3092,7 +3093,7 @@
     // EXTRQI: Extract Length bits starting from Index. Zero pad the remaining
     // bits of the lower 64-bits. The upper 64-bits are undefined.
     Value *Op0 = II->getArgOperand(0);
-    unsigned VWidth = cast<VectorType>(Op0->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(Op0->getType())->getNumElements();
     assert(Op0->getType()->getPrimitiveSizeInBits() == 128 && VWidth == 2 &&
            "Unexpected operand size");
 
@@ -3114,10 +3115,10 @@
   case Intrinsic::x86_sse4a_insertq: {
     Value *Op0 = II->getArgOperand(0);
     Value *Op1 = II->getArgOperand(1);
-    unsigned VWidth = cast<VectorType>(Op0->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(Op0->getType())->getNumElements();
     assert(Op0->getType()->getPrimitiveSizeInBits() == 128 &&
            Op1->getType()->getPrimitiveSizeInBits() == 128 && VWidth == 2 &&
-           cast<VectorType>(Op1->getType())->getNumElements() == 2 &&
+           cast<FixedVectorType>(Op1->getType())->getNumElements() == 2 &&
            "Unexpected operand size");
 
     // See if we're dealing with constant values.
@@ -3148,8 +3149,8 @@
     // undefined.
     Value *Op0 = II->getArgOperand(0);
     Value *Op1 = II->getArgOperand(1);
-    unsigned VWidth0 = cast<VectorType>(Op0->getType())->getNumElements();
-    unsigned VWidth1 = cast<VectorType>(Op1->getType())->getNumElements();
+    unsigned VWidth0 = cast<FixedVectorType>(Op0->getType())->getNumElements();
+    unsigned VWidth1 = cast<FixedVectorType>(Op1->getType())->getNumElements();
     assert(Op0->getType()->getPrimitiveSizeInBits() == 128 &&
            Op1->getType()->getPrimitiveSizeInBits() == 128 && VWidth0 == 2 &&
            VWidth1 == 2 && "Unexpected operand sizes");
@@ -3217,9 +3218,9 @@
              "Not expecting mask and operands with different sizes");
 
       unsigned NumMaskElts =
-          cast<VectorType>(Mask->getType())->getNumElements();
+          cast<FixedVectorType>(Mask->getType())->getNumElements();
       unsigned NumOperandElts =
-          cast<VectorType>(II->getType())->getNumElements();
+          cast<FixedVectorType>(II->getType())->getNumElements();
       if (NumMaskElts == NumOperandElts)
         return SelectInst::Create(BoolVec, Op1, Op0);
 
@@ -3310,7 +3311,7 @@
     // the permutation mask with respect to 31 and reverse the order of
     // V1 and V2.
     if (Constant *Mask = dyn_cast<Constant>(II->getArgOperand(2))) {
-      assert(cast<VectorType>(Mask->getType())->getNumElements() == 16 &&
+      assert(cast<FixedVectorType>(Mask->getType())->getNumElements() == 16 &&
              "Bad type for intrinsic!");
 
       // Check that all of the elements are integer constants or undefs.
@@ -3467,7 +3468,7 @@
       if (auto *CI = dyn_cast<ConstantInt>(XorMask)) {
         if (CI->getValue().trunc(16).isAllOnesValue()) {
           auto TrueVector = Builder.CreateVectorSplat(
-              cast<VectorType>(II->getType())->getNumElements(),
+              cast<FixedVectorType>(II->getType())->getNumElements(),
               Builder.getTrue());
           return BinaryOperator::Create(Instruction::Xor, ArgArg, TrueVector);
         }
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -872,7 +872,7 @@
   //   extractelement <8 x i32> (bitcast <4 x i64> %X to <8 x i32>), i32 0
   Value *VecOp;
   if (match(Src, m_OneUse(m_ExtractElt(m_Value(VecOp), m_ConstantInt(Cst))))) {
-    auto *VecOpTy = cast<VectorType>(VecOp->getType());
+    auto *VecOpTy = cast<FixedVectorType>(VecOp->getType());
     unsigned VecNumElts = VecOpTy->getNumElements();
 
     // A badly fit destination size would result in an invalid cast.
@@ -1535,7 +1535,7 @@
 
   Type *MinType = nullptr;
 
-  unsigned NumElts = CVVTy->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(CVVTy)->getNumElements();
   for (unsigned i = 0; i != NumElts; ++i) {
     auto *CFP = dyn_cast_or_null<ConstantFP>(CV->getAggregateElement(i));
     if (!CFP)
@@ -1940,7 +1940,8 @@
   if (auto *VTy = dyn_cast<VectorType>(Ty)) {
     // Handle vectors of pointers.
     // FIXME: what should happen for scalable vectors?
-    PtrTy = FixedVectorType::get(PtrTy, VTy->getNumElements());
+    PtrTy = FixedVectorType::get(PtrTy,
+                                 cast<FixedVectorType>(VTy)->getNumElements());
   }
 
   Value *P = Builder.CreatePtrToInt(CI.getOperand(0), PtrTy);
@@ -1981,13 +1982,14 @@
       return nullptr;
 
     SrcTy =
-        FixedVectorType::get(DestTy->getElementType(), SrcTy->getNumElements());
+        FixedVectorType::get(DestTy->getElementType(),
+                             cast<FixedVectorType>(SrcTy)->getNumElements());
     InVal = IC.Builder.CreateBitCast(InVal, SrcTy);
   }
 
   bool IsBigEndian = IC.getDataLayout().isBigEndian();
-  unsigned SrcElts = SrcTy->getNumElements();
-  unsigned DestElts = DestTy->getNumElements();
+  unsigned SrcElts = cast<FixedVectorType>(SrcTy)->getNumElements();
+  unsigned DestElts = cast<FixedVectorType>(DestTy)->getNumElements();
 
   assert(SrcElts != DestElts && "Element counts should be different.");
 
@@ -2166,7 +2168,7 @@
 /// Into two insertelements that do "buildvector{%inc, %inc5}".
 static Value *optimizeIntegerToVectorInsertions(BitCastInst &CI,
                                                 InstCombiner &IC) {
-  VectorType *DestVecTy = cast<VectorType>(CI.getType());
+  auto *DestVecTy = cast<FixedVectorType>(CI.getType());
   Value *IntInput = CI.getOperand(0);
 
   SmallVector<Value*, 8> Elements(DestVecTy->getNumElements());
@@ -2206,7 +2208,8 @@
   if (!VectorType::isValidElementType(DestType))
     return nullptr;
 
-  unsigned NumElts = ExtElt->getVectorOperandType()->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(ExtElt->getVectorOperandType())->getNumElements();
   auto *NewVecType = FixedVectorType::get(DestType, NumElts);
   auto *NewBC = IC.Builder.CreateBitCast(ExtElt->getVectorOperand(),
                                          NewVecType, "bc");
@@ -2273,7 +2276,8 @@
   if (auto *CondVTy = dyn_cast<VectorType>(CondTy)) {
     if (!DestTy->isVectorTy())
       return nullptr;
-    if (cast<VectorType>(DestTy)->getNumElements() != CondVTy->getNumElements())
+    if (cast<FixedVectorType>(DestTy)->getNumElements() !=
+        cast<FixedVectorType>(CondVTy)->getNumElements())
       return nullptr;
   }
 
@@ -2608,11 +2612,12 @@
     // a bitcast to a vector with the same # elts.
     Value *ShufOp0 = Shuf->getOperand(0);
     Value *ShufOp1 = Shuf->getOperand(1);
-    unsigned NumShufElts = Shuf->getType()->getNumElements();
+    unsigned NumShufElts =
+        cast<FixedVectorType>(Shuf->getType())->getNumElements();
     unsigned NumSrcVecElts =
-        cast<VectorType>(ShufOp0->getType())->getNumElements();
+        cast<FixedVectorType>(ShufOp0->getType())->getNumElements();
     if (Shuf->hasOneUse() && DestTy->isVectorTy() &&
-        cast<VectorType>(DestTy)->getNumElements() == NumShufElts &&
+        cast<FixedVectorType>(DestTy)->getNumElements() == NumShufElts &&
         NumShufElts == NumSrcVecElts) {
       BitCastInst *Tmp;
       // If either of the operands is a cast from CI.getType(), then
@@ -2680,7 +2685,8 @@
     if (VectorType *VT = dyn_cast<VectorType>(CI.getType())) {
       // Handle vectors of pointers.
       // FIXME: what should happen for scalable vectors?
-      MidTy = FixedVectorType::get(MidTy, VT->getNumElements());
+      MidTy = FixedVectorType::get(MidTy,
+                                   cast<FixedVectorType>(VT)->getNumElements());
     }
 
     Value *NewBitCast = Builder.CreateBitCast(Src, MidTy);
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -897,7 +897,7 @@
     // For vectors, we apply the same reasoning on a per-lane basis.
     auto *Base = GEPLHS->getPointerOperand();
     if (GEPLHS->getType()->isVectorTy() && Base->getType()->isPointerTy()) {
-      int NumElts = cast<VectorType>(GEPLHS->getType())->getNumElements();
+      int NumElts = cast<FixedVectorType>(GEPLHS->getType())->getNumElements();
       Base = Builder.CreateVectorSplat(NumElts, Base);
     }
     return new ICmpInst(Cond, Base,
@@ -1883,7 +1883,8 @@
     if (ExactLogBase2 != -1 && DL.isLegalInteger(ExactLogBase2 + 1)) {
       Type *NTy = IntegerType::get(Cmp.getContext(), ExactLogBase2 + 1);
       if (auto *AndVTy = dyn_cast<VectorType>(And->getType()))
-        NTy = FixedVectorType::get(NTy, AndVTy->getNumElements());
+        NTy = FixedVectorType::get(
+            NTy, cast<FixedVectorType>(AndVTy)->getNumElements());
       Value *Trunc = Builder.CreateTrunc(X, NTy);
       auto NewPred = Cmp.getPredicate() == CmpInst::ICMP_EQ ? CmpInst::ICMP_SGE
                                                             : CmpInst::ICMP_SLT;
@@ -2173,7 +2174,8 @@
       DL.isLegalInteger(TypeBits - Amt)) {
     Type *TruncTy = IntegerType::get(Cmp.getContext(), TypeBits - Amt);
     if (auto *ShVTy = dyn_cast<VectorType>(ShType))
-      TruncTy = FixedVectorType::get(TruncTy, ShVTy->getNumElements());
+      TruncTy = FixedVectorType::get(
+          TruncTy, cast<FixedVectorType>(ShVTy)->getNumElements());
     Constant *NewC =
         ConstantInt::get(TruncTy, C.ashr(*ShiftAmt).trunc(TypeBits - Amt));
     return new ICmpInst(Pred, Builder.CreateTrunc(X, TruncTy), NewC);
@@ -2806,7 +2808,8 @@
 
           Type *NewType = Builder.getIntNTy(XType->getScalarSizeInBits());
           if (auto *XVTy = dyn_cast<VectorType>(XType))
-            NewType = FixedVectorType::get(NewType, XVTy->getNumElements());
+            NewType = FixedVectorType::get(
+                NewType, cast<FixedVectorType>(XVTy)->getNumElements());
           Value *NewBitcast = Builder.CreateBitCast(X, NewType);
           if (TrueIfSigned)
             return new ICmpInst(ICmpInst::ICMP_SLT, NewBitcast,
@@ -3384,7 +3387,7 @@
   Type *OpTy = M->getType();
   auto *VecC = dyn_cast<Constant>(M);
   if (OpTy->isVectorTy() && VecC && VecC->containsUndefElement()) {
-    auto *OpVTy = cast<VectorType>(OpTy);
+    auto *OpVTy = cast<FixedVectorType>(OpTy);
     Constant *SafeReplacementConstant = nullptr;
     for (unsigned i = 0, e = OpVTy->getNumElements(); i != e; ++i) {
       if (!isa<UndefValue>(VecC->getAggregateElement(i))) {
@@ -5210,7 +5213,7 @@
     if (!ConstantIsOk(CI))
       return llvm::None;
   } else if (auto *VTy = dyn_cast<VectorType>(Type)) {
-    unsigned NumElts = VTy->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(VTy)->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = C->getAggregateElement(i);
       if (!Elt)
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -292,7 +292,7 @@
     }
   }
   assert(SafeC && "Must have safe constant for binop");
-  unsigned NumElts = InVTy->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(InVTy)->getNumElements();
   SmallVector<Constant *, 16> Out(NumElts);
   for (unsigned i = 0; i != NumElts; ++i) {
     Constant *C = In->getAggregateElement(i);
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
@@ -1060,11 +1060,11 @@
     return nullptr;
   }
   if (auto *AT = dyn_cast<ArrayType>(VT)) {
-    if (AT->getNumElements() != UT->getNumElements())
+    if (AT->getNumElements() != cast<FixedVectorType>(UT)->getNumElements())
       return nullptr;
   } else {
     auto *ST = cast<StructType>(VT);
-    if (ST->getNumElements() != UT->getNumElements())
+    if (ST->getNumElements() != cast<FixedVectorType>(UT)->getNumElements())
       return nullptr;
     for (const auto *EltT : ST->elements()) {
       if (EltT != UT->getElementType())
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
@@ -1498,7 +1498,7 @@
   // If it's a constant vector, flip any negative values positive.
   if (isa<ConstantVector>(Op1) || isa<ConstantDataVector>(Op1)) {
     Constant *C = cast<Constant>(Op1);
-    unsigned VWidth = cast<VectorType>(C->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(C->getType())->getNumElements();
 
     bool hasNegative = false;
     bool hasMissing = false;
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -304,8 +304,8 @@
     if (auto *CondVTy = dyn_cast<VectorType>(CondTy)) {
       if (!FIOpndTy->isVectorTy())
         return nullptr;
-      if (CondVTy->getNumElements() !=
-          cast<VectorType>(FIOpndTy)->getNumElements())
+      if (cast<FixedVectorType>(CondVTy)->getNumElements() !=
+          cast<FixedVectorType>(FIOpndTy)->getNumElements())
         return nullptr;
 
       // TODO: If the backend knew how to deal with casts better, we could
@@ -1969,7 +1969,8 @@
   if (!CondVal->getType()->isVectorTy() || !match(CondVal, m_Constant(CondC)))
     return nullptr;
 
-  unsigned NumElts = cast<VectorType>(CondVal->getType())->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(CondVal->getType())->getNumElements();
   SmallVector<int, 16> Mask;
   Mask.reserve(NumElts);
   for (unsigned i = 0; i != NumElts; ++i) {
@@ -2015,7 +2016,7 @@
   // select (extelt V, Index), T, F --> select (splat V, Index), T, F
   // Splatting the extracted condition reduces code (we could directly create a
   // splat shuffle of the source vector to eliminate the intermediate step).
-  unsigned NumElts = Ty->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Ty)->getNumElements();
   return IC.replaceOperand(Sel, 0, IC.Builder.CreateVectorSplat(NumElts, Cond));
 }
 
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
@@ -391,7 +391,8 @@
     if (VectorType *DstVTy = dyn_cast<VectorType>(I->getType())) {
       if (VectorType *SrcVTy =
             dyn_cast<VectorType>(I->getOperand(0)->getType())) {
-        if (DstVTy->getNumElements() != SrcVTy->getNumElements())
+        if (cast<FixedVectorType>(DstVTy)->getNumElements() !=
+            cast<FixedVectorType>(SrcVTy)->getNumElements())
           // Don't touch a bitcast between vectors of different element counts.
           return nullptr;
       } else
@@ -798,7 +799,7 @@
           ArgWidth = 8; // Arg is x86_mmx, but treated as <8 x i8>.
         } else {
           auto Arg = II->getArgOperand(0);
-          auto ArgType = cast<VectorType>(Arg->getType());
+          auto ArgType = cast<FixedVectorType>(Arg->getType());
           ArgWidth = ArgType->getNumElements();
         }
 
@@ -1036,7 +1037,7 @@
       DemandedElts.getActiveBits() == 3)
     return nullptr;
 
-  auto *IIVTy = cast<VectorType>(II->getType());
+  auto *IIVTy = cast<FixedVectorType>(II->getType());
   unsigned VWidth = IIVTy->getNumElements();
   if (VWidth == 1)
     return nullptr;
@@ -1349,8 +1350,8 @@
     assert(Shuffle->getOperand(0)->getType() ==
            Shuffle->getOperand(1)->getType() &&
            "Expected shuffle operands to have same type");
-    unsigned OpWidth =
-        cast<VectorType>(Shuffle->getOperand(0)->getType())->getNumElements();
+    unsigned OpWidth = cast<FixedVectorType>(Shuffle->getOperand(0)->getType())
+                           ->getNumElements();
     // Handle trivial case of a splat. Only check the first element of LHS
     // operand.
     if (all_of(Shuffle->getShuffleMask(), [](int Elt) { return Elt == 0; }) &&
@@ -1451,7 +1452,8 @@
     // this constant vector to single insertelement instruction.
     // shufflevector V, C, <v1, v2, .., ci, .., vm> ->
     // insertelement V, C[ci], ci-n
-    if (OpWidth == Shuffle->getType()->getNumElements()) {
+    if (OpWidth ==
+        cast<FixedVectorType>(Shuffle->getType())->getNumElements()) {
       Value *Op = nullptr;
       Constant *Value = nullptr;
       unsigned Idx = -1u;
@@ -1538,7 +1540,7 @@
     // Vector->vector casts only.
     VectorType *VTy = dyn_cast<VectorType>(I->getOperand(0)->getType());
     if (!VTy) break;
-    unsigned InVWidth = VTy->getNumElements();
+    unsigned InVWidth = cast<FixedVectorType>(VTy)->getNumElements();
     APInt InputDemandedElts(InVWidth, 0);
     UndefElts2 = APInt(InVWidth, 0);
     unsigned Ratio;
@@ -1763,7 +1765,7 @@
     case Intrinsic::x86_avx512_packusdw_512:
     case Intrinsic::x86_avx512_packuswb_512: {
       auto *Ty0 = II->getArgOperand(0)->getType();
-      unsigned InnerVWidth = cast<VectorType>(Ty0)->getNumElements();
+      unsigned InnerVWidth = cast<FixedVectorType>(Ty0)->getNumElements();
       assert(VWidth == (InnerVWidth * 2) && "Unexpected input size");
 
       unsigned NumLanes = Ty0->getPrimitiveSizeInBits() / 128;
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -176,10 +176,11 @@
   // If this extractelement is using a bitcast from a vector of the same number
   // of elements, see if we can find the source element from the source vector:
   // extelt (bitcast VecX), IndexC --> bitcast X[IndexC]
-  auto *SrcTy = cast<VectorType>(X->getType());
+  auto *SrcTy = cast<FixedVectorType>(X->getType());
   Type *DestTy = Ext.getType();
   unsigned NumSrcElts = SrcTy->getNumElements();
-  unsigned NumElts = Ext.getVectorOperandType()->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(Ext.getVectorOperandType())->getNumElements();
   if (NumSrcElts == NumElts)
     if (Value *Elt = findScalarElement(X, ExtIndexC))
       return new BitCastInst(Elt, DestTy);
@@ -259,7 +260,7 @@
 
 /// Find elements of V demanded by UserInstr.
 static APInt findDemandedEltsBySingleUser(Value *V, Instruction *UserInstr) {
-  unsigned VWidth = cast<VectorType>(V->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(V->getType())->getNumElements();
 
   // Conservatively assume that all elements are needed.
   APInt UsedElts(APInt::getAllOnesValue(VWidth));
@@ -277,7 +278,7 @@
   case Instruction::ShuffleVector: {
     ShuffleVectorInst *Shuffle = cast<ShuffleVectorInst>(UserInstr);
     unsigned MaskNumElts =
-        cast<VectorType>(UserInstr->getType())->getNumElements();
+        cast<FixedVectorType>(UserInstr->getType())->getNumElements();
 
     UsedElts = APInt(VWidth, 0);
     for (unsigned i = 0; i < MaskNumElts; i++) {
@@ -303,7 +304,7 @@
 /// no user demands an element of V, then the corresponding bit
 /// remains unset in the returned value.
 static APInt findDemandedEltsByAllUsers(Value *V) {
-  unsigned VWidth = cast<VectorType>(V->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(V->getType())->getNumElements();
 
   APInt UnionUsedElts(VWidth, 0);
   for (const Use &U : V->uses()) {
@@ -460,7 +461,7 @@
                                          SmallVectorImpl<int> &Mask) {
   assert(LHS->getType() == RHS->getType() &&
          "Invalid CollectSingleShuffleElements");
-  unsigned NumElts = cast<VectorType>(V->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(V->getType())->getNumElements();
 
   if (isa<UndefValue>(V)) {
     Mask.assign(NumElts, -1);
@@ -502,7 +503,7 @@
         unsigned ExtractedIdx =
         cast<ConstantInt>(EI->getOperand(1))->getZExtValue();
         unsigned NumLHSElts =
-            cast<VectorType>(LHS->getType())->getNumElements();
+            cast<FixedVectorType>(LHS->getType())->getNumElements();
 
         // This must be extracting from either LHS or RHS.
         if (EI->getOperand(0) == LHS || EI->getOperand(0) == RHS) {
@@ -532,8 +533,8 @@
 static void replaceExtractElements(InsertElementInst *InsElt,
                                    ExtractElementInst *ExtElt,
                                    InstCombiner &IC) {
-  VectorType *InsVecType = InsElt->getType();
-  VectorType *ExtVecType = ExtElt->getVectorOperandType();
+  auto *InsVecType = cast<FixedVectorType>(InsElt->getType());
+  auto *ExtVecType = cast<FixedVectorType>(ExtElt->getVectorOperandType());
   unsigned NumInsElts = InsVecType->getNumElements();
   unsigned NumExtElts = ExtVecType->getNumElements();
 
@@ -661,7 +662,7 @@
           }
 
           unsigned NumLHSElts =
-              cast<VectorType>(RHS->getType())->getNumElements();
+              cast<FixedVectorType>(RHS->getType())->getNumElements();
           Mask[InsertedIdx % NumElts] = NumLHSElts + ExtractedIdx;
           return std::make_pair(LR.first, RHS);
         }
@@ -670,7 +671,8 @@
           // We've gone as far as we can: anything on the other side of the
           // extractelement will already have been converted into a shuffle.
           unsigned NumLHSElts =
-              cast<VectorType>(EI->getOperand(0)->getType())->getNumElements();
+              cast<FixedVectorType>(EI->getOperand(0)->getType())
+                  ->getNumElements();
           for (unsigned i = 0; i != NumElts; ++i)
             Mask.push_back(i == InsertedIdx ? ExtractedIdx : NumLHSElts + i);
           return std::make_pair(EI->getOperand(0), PermittedRHS);
@@ -854,7 +856,8 @@
   // For example:
   // inselt (shuf (inselt undef, X, 0), undef, <0,undef,0,undef>), X, 1
   //   --> shuf (inselt undef, X, 0), undef, <0,0,0,undef>
-  unsigned NumMaskElts = Shuf->getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf->getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts);
   for (unsigned i = 0; i != NumMaskElts; ++i)
     NewMask[i] = i == IdxC ? 0 : Shuf->getMaskValue(i);
@@ -892,7 +895,8 @@
   // that same index value.
   // For example:
   // inselt (shuf X, IdMask), (extelt X, IdxC), IdxC --> shuf X, IdMask'
-  unsigned NumMaskElts = Shuf->getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf->getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts);
   ArrayRef<int> OldMask = Shuf->getShuffleMask();
   for (unsigned i = 0; i != NumMaskElts; ++i) {
@@ -1222,7 +1226,7 @@
       // longer vector ops, but that may result in more expensive codegen.
       Type *ITy = I->getType();
       if (ITy->isVectorTy() &&
-          Mask.size() > cast<VectorType>(ITy)->getNumElements())
+          Mask.size() > cast<FixedVectorType>(ITy)->getNumElements())
         return false;
       for (Value *Operand : I->operands()) {
         if (!canEvaluateShuffled(Operand, Mask, Depth - 1))
@@ -1380,7 +1384,8 @@
     case Instruction::GetElementPtr: {
       SmallVector<Value*, 8> NewOps;
       bool NeedsRebuild =
-          (Mask.size() != cast<VectorType>(I->getType())->getNumElements());
+          (Mask.size() !=
+           cast<FixedVectorType>(I->getType())->getNumElements());
       for (int i = 0, e = I->getNumOperands(); i != e; ++i) {
         Value *V;
         // Recursively call evaluateInDifferentElementOrder on vector arguments
@@ -1435,7 +1440,7 @@
 static bool isShuffleExtractingFromLHS(ShuffleVectorInst &SVI,
                                        ArrayRef<int> Mask) {
   unsigned LHSElems =
-      cast<VectorType>(SVI.getOperand(0)->getType())->getNumElements();
+      cast<FixedVectorType>(SVI.getOperand(0)->getType())->getNumElements();
   unsigned MaskElems = Mask.size();
   unsigned BegIdx = Mask.front();
   unsigned EndIdx = Mask.back();
@@ -1567,7 +1572,8 @@
   // For example:
   // shuf (inselt undef, X, 2), undef, <2,2,undef>
   //   --> shuf (inselt undef, X, 0), undef, <0,0,undef>
-  unsigned NumMaskElts = Shuf.getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf.getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts, 0);
   for (unsigned i = 0; i != NumMaskElts; ++i)
     if (Mask[i] == UndefMaskElem)
@@ -1585,7 +1591,7 @@
 
   // Canonicalize to choose from operand 0 first unless operand 1 is undefined.
   // Commuting undef to operand 0 conflicts with another canonicalization.
-  unsigned NumElts = Shuf.getType()->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Shuf.getType())->getNumElements();
   if (!isa<UndefValue>(Shuf.getOperand(1)) &&
       Shuf.getMaskValue(0) >= (int)NumElts) {
     // TODO: Can we assert that both operands of a shuffle-select are not undef
@@ -1719,8 +1725,8 @@
   // and the source element type must be larger than the shuffle element type.
   Type *SrcType = X->getType();
   if (!SrcType->isVectorTy() || !SrcType->isIntOrIntVectorTy() ||
-      cast<VectorType>(SrcType)->getNumElements() !=
-          cast<VectorType>(DestType)->getNumElements() ||
+      cast<FixedVectorType>(SrcType)->getNumElements() !=
+          cast<FixedVectorType>(DestType)->getNumElements() ||
       SrcType->getScalarSizeInBits() % DestType->getScalarSizeInBits() != 0)
     return nullptr;
 
@@ -1764,10 +1770,11 @@
 
   // We need a narrow condition value. It must be extended with undef elements
   // and have the same number of elements as this shuffle.
-  unsigned NarrowNumElts = Shuf.getType()->getNumElements();
+  unsigned NarrowNumElts =
+      cast<FixedVectorType>(Shuf.getType())->getNumElements();
   Value *NarrowCond;
   if (!match(Cond, m_OneUse(m_Shuffle(m_Value(NarrowCond), m_Undef()))) ||
-      cast<VectorType>(NarrowCond->getType())->getNumElements() !=
+      cast<FixedVectorType>(NarrowCond->getType())->getNumElements() !=
           NarrowNumElts ||
       !cast<ShuffleVectorInst>(Cond)->isIdentityWithPadding())
     return nullptr;
@@ -1807,7 +1814,7 @@
   // new shuffle mask. Otherwise, copy the original mask element. Example:
   //   shuf (shuf X, Y, <C0, C1, C2, undef, C4>), undef, <0, undef, 2, 3> -->
   //   shuf X, Y, <C0, undef, C2, undef>
-  unsigned NumElts = Shuf.getType()->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Shuf.getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumElts);
   assert(NumElts < Mask.size() &&
          "Identity with extract must have less elements than its inputs");
@@ -1832,7 +1839,7 @@
   // TODO: This restriction could be removed if the insert has only one use
   //       (because the transform would require a new length-changing shuffle).
   int NumElts = Mask.size();
-  if (NumElts != (int)(cast<VectorType>(V0->getType())->getNumElements()))
+  if (NumElts != (int)(cast<FixedVectorType>(V0->getType())->getNumElements()))
     return nullptr;
 
   // This is a specialization of a fold in SimplifyDemandedVectorElts. We may
@@ -1927,9 +1934,10 @@
   Value *X = Shuffle0->getOperand(0);
   Value *Y = Shuffle1->getOperand(0);
   if (X->getType() != Y->getType() ||
-      !isPowerOf2_32(Shuf.getType()->getNumElements()) ||
-      !isPowerOf2_32(Shuffle0->getType()->getNumElements()) ||
-      !isPowerOf2_32(cast<VectorType>(X->getType())->getNumElements()) ||
+      !isPowerOf2_32(cast<FixedVectorType>(Shuf.getType())->getNumElements()) ||
+      !isPowerOf2_32(
+          cast<FixedVectorType>(Shuffle0->getType())->getNumElements()) ||
+      !isPowerOf2_32(cast<FixedVectorType>(X->getType())->getNumElements()) ||
       isa<UndefValue>(X) || isa<UndefValue>(Y))
     return nullptr;
   assert(isa<UndefValue>(Shuffle0->getOperand(1)) &&
@@ -1940,8 +1948,8 @@
   // operands directly by adjusting the shuffle mask to account for the narrower
   // types:
   // shuf (widen X), (widen Y), Mask --> shuf X, Y, Mask'
-  int NarrowElts = cast<VectorType>(X->getType())->getNumElements();
-  int WideElts = Shuffle0->getType()->getNumElements();
+  int NarrowElts = cast<FixedVectorType>(X->getType())->getNumElements();
+  int WideElts = cast<FixedVectorType>(Shuffle0->getType())->getNumElements();
   assert(WideElts > NarrowElts && "Unexpected types for identity with padding");
 
   ArrayRef<int> Mask = Shuf.getShuffleMask();
@@ -1983,8 +1991,8 @@
     return replaceInstUsesWith(SVI, V);
 
   // shuffle x, x, mask --> shuffle x, undef, mask'
-  unsigned VWidth = SVI.getType()->getNumElements();
-  unsigned LHSWidth = cast<VectorType>(LHS->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(SVI.getType())->getNumElements();
+  unsigned LHSWidth = cast<FixedVectorType>(LHS->getType())->getNumElements();
   ArrayRef<int> Mask = SVI.getShuffleMask();
   Type *Int32Ty = Type::getInt32Ty(SVI.getContext());
 
@@ -1998,7 +2006,7 @@
   if (match(LHS, m_BitCast(m_Value(X))) && match(RHS, m_Undef()) &&
       X->getType()->isVectorTy() && VWidth == LHSWidth) {
     // Try to create a scaled mask constant.
-    auto *XType = cast<VectorType>(X->getType());
+    auto *XType = cast<FixedVectorType>(X->getType());
     unsigned XNumElts = XType->getNumElements();
     SmallVector<int, 16> ScaledMask;
     if (XNumElts >= VWidth) {
@@ -2106,7 +2114,7 @@
   if (isShuffleExtractingFromLHS(SVI, Mask)) {
     Value *V = LHS;
     unsigned MaskElems = Mask.size();
-    VectorType *SrcTy = cast<VectorType>(V->getType());
+    auto *SrcTy = cast<FixedVectorType>(V->getType());
     unsigned VecBitWidth = SrcTy->getPrimitiveSizeInBits().getFixedSize();
     unsigned SrcElemBitWidth = DL.getTypeSizeInBits(SrcTy->getElementType());
     assert(SrcElemBitWidth && "vector elements must have a bitwidth");
@@ -2224,11 +2232,11 @@
   if (LHSShuffle) {
     LHSOp0 = LHSShuffle->getOperand(0);
     LHSOp1 = LHSShuffle->getOperand(1);
-    LHSOp0Width = cast<VectorType>(LHSOp0->getType())->getNumElements();
+    LHSOp0Width = cast<FixedVectorType>(LHSOp0->getType())->getNumElements();
   }
   if (RHSShuffle) {
     RHSOp0 = RHSShuffle->getOperand(0);
-    RHSOp0Width = cast<VectorType>(RHSOp0->getType())->getNumElements();
+    RHSOp0Width = cast<FixedVectorType>(RHSOp0->getType())->getNumElements();
   }
   Value* newLHS = LHS;
   Value* newRHS = RHS;
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -913,7 +913,8 @@
       return nullptr;
 
     // If vectors, verify that they have the same number of elements.
-    if (SrcTy && SrcTy->getNumElements() != DestTy->getNumElements())
+    if (SrcTy && cast<FixedVectorType>(SrcTy)->getNumElements() !=
+                     cast<FixedVectorType>(DestTy)->getNumElements())
       return nullptr;
   }
 
@@ -2313,7 +2314,7 @@
     // gep (bitcast [c x ty]* X to <c x ty>*), Y, Z --> gep X, Y, Z
     auto areMatchingArrayAndVecTypes = [](Type *ArrTy, Type *VecTy,
                                           const DataLayout &DL) {
-      auto *VecVTy = cast<VectorType>(VecTy);
+      auto *VecVTy = cast<FixedVectorType>(VecTy);
       return ArrTy->getArrayElementType() == VecVTy->getElementType() &&
              ArrTy->getArrayNumElements() == VecVTy->getNumElements() &&
              DL.getTypeAllocSize(ArrTy) == DL.getTypeAllocSize(VecTy);