diff --git a/llvm/include/llvm/IR/Constants.h b/llvm/include/llvm/IR/Constants.h
--- a/llvm/include/llvm/IR/Constants.h
+++ b/llvm/include/llvm/IR/Constants.h
@@ -803,8 +803,8 @@
 
   /// Specialize the getType() method to always return a VectorType,
   /// which reduces the amount of casting needed in parts of the compiler.
-  inline VectorType *getType() const {
-    return cast<VectorType>(Value::getType());
+  inline FixedVectorType *getType() const {
+    return cast<FixedVectorType>(Value::getType());
   }
 
   /// Methods for support type inquiry through isa, cast, and dyn_cast:
diff --git a/llvm/include/llvm/IR/GetElementPtrTypeIterator.h b/llvm/include/llvm/IR/GetElementPtrTypeIterator.h
--- a/llvm/include/llvm/IR/GetElementPtrTypeIterator.h
+++ b/llvm/include/llvm/IR/GetElementPtrTypeIterator.h
@@ -83,7 +83,7 @@
         if (isa<ScalableVectorType>(VTy))
           NumElements = Unbounded;
         else
-          NumElements = VTy->getNumElements();
+          NumElements = cast<FixedVectorType>(VTy)->getNumElements();
       } else
         CurTy = dyn_cast<StructType>(Ty);
       ++OpIt;
diff --git a/llvm/include/llvm/IR/Instructions.h b/llvm/include/llvm/IR/Instructions.h
--- a/llvm/include/llvm/IR/Instructions.h
+++ b/llvm/include/llvm/IR/Instructions.h
@@ -1992,7 +1992,7 @@
   ///           shufflevector <4 x n> A, <4 x n> B, <1,2,3,4,5>
   bool changesLength() const {
     unsigned NumSourceElts =
-        cast<VectorType>(Op<0>()->getType())->getNumElements();
+        cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
     unsigned NumMaskElts = ShuffleMask.size();
     return NumSourceElts != NumMaskElts;
   }
@@ -2002,7 +2002,7 @@
   /// Example: shufflevector <2 x n> A, <2 x n> B, <1,2,3>
   bool increasesLength() const {
     unsigned NumSourceElts =
-        cast<VectorType>(Op<0>()->getType())->getNumElements();
+        cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
     unsigned NumMaskElts = ShuffleMask.size();
     return NumSourceElts < NumMaskElts;
   }
@@ -2195,7 +2195,8 @@
 
   /// Return true if this shuffle mask is an extract subvector mask.
   bool isExtractSubvectorMask(int &Index) const {
-    int NumSrcElts = cast<VectorType>(Op<0>()->getType())->getNumElements();
+    int NumSrcElts =
+        cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
     return isExtractSubvectorMask(ShuffleMask, NumSrcElts, Index);
   }
 
diff --git a/llvm/include/llvm/IR/PatternMatch.h b/llvm/include/llvm/IR/PatternMatch.h
--- a/llvm/include/llvm/IR/PatternMatch.h
+++ b/llvm/include/llvm/IR/PatternMatch.h
@@ -275,7 +275,8 @@
           return this->isValue(CI->getValue());
 
         // Non-splat vector constant: check each element for a match.
-        unsigned NumElts = cast<VectorType>(V->getType())->getNumElements();
+        unsigned NumElts =
+            cast<FixedVectorType>(V->getType())->getNumElements();
         assert(NumElts != 0 && "Constant vector with no elements?");
         bool HasNonUndefElements = false;
         for (unsigned i = 0; i != NumElts; ++i) {
@@ -334,7 +335,8 @@
           return this->isValue(CF->getValueAPF());
 
         // Non-splat vector constant: check each element for a match.
-        unsigned NumElts = cast<VectorType>(V->getType())->getNumElements();
+        unsigned NumElts =
+            cast<FixedVectorType>(V->getType())->getNumElements();
         assert(NumElts != 0 && "Constant vector with no elements?");
         bool HasNonUndefElements = false;
         for (unsigned i = 0; i != NumElts; ++i) {
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -656,7 +656,7 @@
     OS << "<";
     if (isa<ScalableVectorType>(PTy))
       OS << "vscale x ";
-    OS << PTy->getNumElements() << " x ";
+    OS << PTy->getElementCount().Min << " x ";
     print(PTy->getElementType(), OS);
     OS << '>';
     return;
@@ -1505,7 +1505,7 @@
   }
 
   if (isa<ConstantVector>(CV) || isa<ConstantDataVector>(CV)) {
-    auto *CVVTy = cast<VectorType>(CV->getType());
+    auto *CVVTy = cast<FixedVectorType>(CV->getType());
     Type *ETy = CVVTy->getElementType();
     Out << '<';
     TypePrinter.print(ETy, Out);
diff --git a/llvm/lib/IR/AutoUpgrade.cpp b/llvm/lib/IR/AutoUpgrade.cpp
--- a/llvm/lib/IR/AutoUpgrade.cpp
+++ b/llvm/lib/IR/AutoUpgrade.cpp
@@ -899,7 +899,7 @@
 // to byte shuffles.
 static Value *UpgradeX86PSLLDQIntrinsics(IRBuilder<> &Builder,
                                          Value *Op, unsigned Shift) {
-  auto *ResultTy = cast<VectorType>(Op->getType());
+  auto *ResultTy = cast<FixedVectorType>(Op->getType());
   unsigned NumElts = ResultTy->getNumElements() * 8;
 
   // Bitcast from a 64-bit element type to a byte element type.
@@ -933,7 +933,7 @@
 // to byte shuffles.
 static Value *UpgradeX86PSRLDQIntrinsics(IRBuilder<> &Builder, Value *Op,
                                          unsigned Shift) {
-  auto *ResultTy = cast<VectorType>(Op->getType());
+  auto *ResultTy = cast<FixedVectorType>(Op->getType());
   unsigned NumElts = ResultTy->getNumElements() * 8;
 
   // Bitcast from a 64-bit element type to a byte element type.
@@ -991,7 +991,7 @@
       return Op0;
 
   Mask = getX86MaskVec(Builder, Mask,
-                       cast<VectorType>(Op0->getType())->getNumElements());
+                       cast<FixedVectorType>(Op0->getType())->getNumElements());
   return Builder.CreateSelect(Mask, Op0, Op1);
 }
 
@@ -1019,7 +1019,7 @@
                                         bool IsVALIGN) {
   unsigned ShiftVal = cast<llvm::ConstantInt>(Shift)->getZExtValue();
 
-  unsigned NumElts = cast<VectorType>(Op0->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Op0->getType())->getNumElements();
   assert((IsVALIGN || NumElts % 16 == 0) && "Illegal NumElts for PALIGNR!");
   assert((!IsVALIGN || NumElts <= 16) && "NumElts too large for VALIGN!");
   assert(isPowerOf2_32(NumElts) && "NumElts not a power of 2!");
@@ -1150,7 +1150,7 @@
   // Funnel shifts amounts are treated as modulo and types are all power-of-2 so
   // we only care about the lowest log2 bits anyway.
   if (Amt->getType() != Ty) {
-    unsigned NumElts = cast<VectorType>(Ty)->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(Ty)->getNumElements();
     Amt = Builder.CreateIntCast(Amt, Ty->getScalarType(), false);
     Amt = Builder.CreateVectorSplat(NumElts, Amt);
   }
@@ -1220,7 +1220,7 @@
   // Funnel shifts amounts are treated as modulo and types are all power-of-2 so
   // we only care about the lowest log2 bits anyway.
   if (Amt->getType() != Ty) {
-    unsigned NumElts = cast<VectorType>(Ty)->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(Ty)->getNumElements();
     Amt = Builder.CreateIntCast(Amt, Ty->getScalarType(), false);
     Amt = Builder.CreateVectorSplat(NumElts, Amt);
   }
@@ -1257,7 +1257,7 @@
       return Builder.CreateAlignedStore(Data, Ptr, Alignment);
 
   // Convert the mask from an integer type to a vector of i1.
-  unsigned NumElts = cast<VectorType>(Data->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Data->getType())->getNumElements();
   Mask = getX86MaskVec(Builder, Mask, NumElts);
   return Builder.CreateMaskedStore(Data, Ptr, Alignment, Mask);
 }
@@ -1280,7 +1280,8 @@
       return Builder.CreateAlignedLoad(ValTy, Ptr, Alignment);
 
   // Convert the mask from an integer type to a vector of i1.
-  unsigned NumElts = cast<VectorType>(Passthru->getType())->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(Passthru->getType())->getNumElements();
   Mask = getX86MaskVec(Builder, Mask, NumElts);
   return Builder.CreateMaskedLoad(Ptr, Alignment, Mask, Passthru);
 }
@@ -1344,7 +1345,7 @@
 // Applying mask on vector of i1's and make sure result is at least 8 bits wide.
 static Value *ApplyX86MaskOn1BitsVec(IRBuilder<> &Builder, Value *Vec,
                                      Value *Mask) {
-  unsigned NumElts = cast<VectorType>(Vec->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Vec->getType())->getNumElements();
   if (Mask) {
     const auto *C = dyn_cast<Constant>(Mask);
     if (!C || !C->isAllOnesValue())
@@ -1367,7 +1368,7 @@
 static Value *upgradeMaskedCompare(IRBuilder<> &Builder, CallInst &CI,
                                    unsigned CC, bool Signed) {
   Value *Op0 = CI.getArgOperand(0);
-  unsigned NumElts = cast<VectorType>(Op0->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Op0->getType())->getNumElements();
 
   Value *Cmp;
   if (CC == 3) {
@@ -1420,7 +1421,7 @@
 static Value* UpgradeMaskToInt(IRBuilder<> &Builder, CallInst &CI) {
   Value* Op = CI.getArgOperand(0);
   Type* ReturnOp = CI.getType();
-  unsigned NumElts = cast<VectorType>(CI.getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(CI.getType())->getNumElements();
   Value *Mask = getX86MaskVec(Builder, Op, NumElts);
   return Builder.CreateSExt(Mask, ReturnOp, "vpmovm2");
 }
@@ -1869,8 +1870,8 @@
       Rep = Builder.CreateICmp(Pred, Rep, Zero);
       Rep = ApplyX86MaskOn1BitsVec(Builder, Rep, Mask);
     } else if (IsX86 && (Name.startswith("avx512.mask.pbroadcast"))){
-      unsigned NumElts =
-          cast<VectorType>(CI->getArgOperand(1)->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getArgOperand(1)->getType())
+                             ->getNumElements();
       Rep = Builder.CreateVectorSplat(NumElts, CI->getArgOperand(0));
       Rep = EmitX86Select(Builder, CI->getArgOperand(2), Rep,
                           CI->getArgOperand(1));
@@ -2120,9 +2121,9 @@
                          Name == "avx.cvt.ps2.pd.256" ||
                          Name == "avx512.mask.cvtps2pd.128" ||
                          Name == "avx512.mask.cvtps2pd.256")) {
-      auto *DstTy = cast<VectorType>(CI->getType());
+      auto *DstTy = cast<FixedVectorType>(CI->getType());
       Rep = CI->getArgOperand(0);
-      auto *SrcTy = cast<VectorType>(Rep->getType());
+      auto *SrcTy = cast<FixedVectorType>(Rep->getType());
 
       unsigned NumDstElts = DstTy->getNumElements();
       if (NumDstElts < SrcTy->getNumElements()) {
@@ -2152,9 +2153,9 @@
                             CI->getArgOperand(1));
     } else if (IsX86 && (Name.startswith("avx512.mask.vcvtph2ps.") ||
                          Name.startswith("vcvtph2ps."))) {
-      auto *DstTy = cast<VectorType>(CI->getType());
+      auto *DstTy = cast<FixedVectorType>(CI->getType());
       Rep = CI->getArgOperand(0);
-      auto *SrcTy = cast<VectorType>(Rep->getType());
+      auto *SrcTy = cast<FixedVectorType>(Rep->getType());
       unsigned NumDstElts = DstTy->getNumElements();
       if (NumDstElts != SrcTy->getNumElements()) {
         assert(NumDstElts == 4 && "Unexpected vector size");
@@ -2175,7 +2176,7 @@
                               CI->getArgOperand(1),CI->getArgOperand(2),
                               /*Aligned*/true);
     } else if (IsX86 && Name.startswith("avx512.mask.expand.load.")) {
-      auto *ResultTy = cast<VectorType>(CI->getType());
+      auto *ResultTy = cast<FixedVectorType>(CI->getType());
       Type *PtrTy = ResultTy->getElementType();
 
       // Cast the pointer to element type.
@@ -2190,7 +2191,7 @@
                                                 ResultTy);
       Rep = Builder.CreateCall(ELd, { Ptr, MaskVec, CI->getOperand(1) });
     } else if (IsX86 && Name.startswith("avx512.mask.compress.store.")) {
-      auto *ResultTy = cast<VectorType>(CI->getArgOperand(1)->getType());
+      auto *ResultTy = cast<FixedVectorType>(CI->getArgOperand(1)->getType());
       Type *PtrTy = ResultTy->getElementType();
 
       // Cast the pointer to element type.
@@ -2206,7 +2207,7 @@
       Rep = Builder.CreateCall(CSt, { CI->getArgOperand(1), Ptr, MaskVec });
     } else if (IsX86 && (Name.startswith("avx512.mask.compress.") ||
                          Name.startswith("avx512.mask.expand."))) {
-      auto *ResultTy = cast<VectorType>(CI->getType());
+      auto *ResultTy = cast<FixedVectorType>(CI->getType());
 
       Value *MaskVec = getX86MaskVec(Builder, CI->getArgOperand(2),
                                      ResultTy->getNumElements());
@@ -2286,7 +2287,7 @@
     } else if (IsX86 && (Name.startswith("avx.vbroadcast.s") ||
                          Name.startswith("avx512.vbroadcast.s"))) {
       // Replace broadcasts with a series of insertelements.
-      auto *VecTy = cast<VectorType>(CI->getType());
+      auto *VecTy = cast<FixedVectorType>(CI->getType());
       Type *EltTy = VecTy->getElementType();
       unsigned EltNum = VecTy->getNumElements();
       Value *Cast = Builder.CreateBitCast(CI->getArgOperand(0),
@@ -2303,8 +2304,8 @@
                          Name.startswith("avx2.pmovzx") ||
                          Name.startswith("avx512.mask.pmovsx") ||
                          Name.startswith("avx512.mask.pmovzx"))) {
-      VectorType *SrcTy = cast<VectorType>(CI->getArgOperand(0)->getType());
-      VectorType *DstTy = cast<VectorType>(CI->getType());
+      auto *SrcTy = cast<VectorType>(CI->getArgOperand(0)->getType());
+      auto *DstTy = cast<FixedVectorType>(CI->getType());
       unsigned NumDstElts = DstTy->getNumElements();
 
       // Extract a subvector of the first NumDstElts lanes and sign/zero extend.
@@ -2371,8 +2372,10 @@
     }else if (IsX86 && (Name.startswith("avx512.mask.broadcastf") ||
                          Name.startswith("avx512.mask.broadcasti"))) {
       unsigned NumSrcElts =
-          cast<VectorType>(CI->getArgOperand(0)->getType())->getNumElements();
-      unsigned NumDstElts = cast<VectorType>(CI->getType())->getNumElements();
+          cast<FixedVectorType>(CI->getArgOperand(0)->getType())
+              ->getNumElements();
+      unsigned NumDstElts =
+          cast<FixedVectorType>(CI->getType())->getNumElements();
 
       SmallVector<int, 8> ShuffleMask(NumDstElts);
       for (unsigned i = 0; i != NumDstElts; ++i)
@@ -2461,7 +2464,7 @@
       Value *Op0 = CI->getArgOperand(0);
       Value *Op1 = CI->getArgOperand(1);
       unsigned Imm = cast <ConstantInt>(CI->getArgOperand(2))->getZExtValue();
-      VectorType *VecTy = cast<VectorType>(CI->getType());
+      auto *VecTy = cast<FixedVectorType>(CI->getType());
       unsigned NumElts = VecTy->getNumElements();
 
       SmallVector<int, 16> Idxs(NumElts);
@@ -2475,8 +2478,10 @@
       Value *Op0 = CI->getArgOperand(0);
       Value *Op1 = CI->getArgOperand(1);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(2))->getZExtValue();
-      unsigned DstNumElts = cast<VectorType>(CI->getType())->getNumElements();
-      unsigned SrcNumElts = cast<VectorType>(Op1->getType())->getNumElements();
+      unsigned DstNumElts =
+          cast<FixedVectorType>(CI->getType())->getNumElements();
+      unsigned SrcNumElts =
+          cast<FixedVectorType>(Op1->getType())->getNumElements();
       unsigned Scale = DstNumElts / SrcNumElts;
 
       // Mask off the high bits of the immediate value; hardware ignores those.
@@ -2519,8 +2524,10 @@
                          Name.startswith("avx512.mask.vextract"))) {
       Value *Op0 = CI->getArgOperand(0);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
-      unsigned DstNumElts = cast<VectorType>(CI->getType())->getNumElements();
-      unsigned SrcNumElts = cast<VectorType>(Op0->getType())->getNumElements();
+      unsigned DstNumElts =
+          cast<FixedVectorType>(CI->getType())->getNumElements();
+      unsigned SrcNumElts =
+          cast<FixedVectorType>(Op0->getType())->getNumElements();
       unsigned Scale = SrcNumElts / DstNumElts;
 
       // Mask off the high bits of the immediate value; hardware ignores those.
@@ -2543,7 +2550,7 @@
                          Name.startswith("avx512.mask.perm.di."))) {
       Value *Op0 = CI->getArgOperand(0);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
-      VectorType *VecTy = cast<VectorType>(CI->getType());
+      auto *VecTy = cast<FixedVectorType>(CI->getType());
       unsigned NumElts = VecTy->getNumElements();
 
       SmallVector<int, 8> Idxs(NumElts);
@@ -2567,7 +2574,7 @@
 
       uint8_t Imm = cast<ConstantInt>(CI->getArgOperand(2))->getZExtValue();
 
-      unsigned NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
       unsigned HalfSize = NumElts / 2;
       SmallVector<int, 8> ShuffleMask(NumElts);
 
@@ -2597,7 +2604,7 @@
                          Name.startswith("avx512.mask.pshuf.d."))) {
       Value *Op0 = CI->getArgOperand(0);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
-      VectorType *VecTy = cast<VectorType>(CI->getType());
+      auto *VecTy = cast<FixedVectorType>(CI->getType());
       unsigned NumElts = VecTy->getNumElements();
       // Calculate the size of each index in the immediate.
       unsigned IdxSize = 64 / VecTy->getScalarSizeInBits();
@@ -2619,7 +2626,7 @@
                          Name.startswith("avx512.mask.pshufl.w."))) {
       Value *Op0 = CI->getArgOperand(0);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
-      unsigned NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
 
       SmallVector<int, 16> Idxs(NumElts);
       for (unsigned l = 0; l != NumElts; l += 8) {
@@ -2638,7 +2645,7 @@
                          Name.startswith("avx512.mask.pshufh.w."))) {
       Value *Op0 = CI->getArgOperand(0);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
-      unsigned NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
 
       SmallVector<int, 16> Idxs(NumElts);
       for (unsigned l = 0; l != NumElts; l += 8) {
@@ -2657,7 +2664,7 @@
       Value *Op0 = CI->getArgOperand(0);
       Value *Op1 = CI->getArgOperand(1);
       unsigned Imm = cast<ConstantInt>(CI->getArgOperand(2))->getZExtValue();
-      unsigned NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
 
       unsigned NumLaneElts = 128/CI->getType()->getScalarSizeInBits();
       unsigned HalfLaneElts = NumLaneElts / 2;
@@ -2682,7 +2689,7 @@
                          Name.startswith("avx512.mask.movshdup") ||
                          Name.startswith("avx512.mask.movsldup"))) {
       Value *Op0 = CI->getArgOperand(0);
-      unsigned NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      unsigned NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
       unsigned NumLaneElts = 128/CI->getType()->getScalarSizeInBits();
 
       unsigned Offset = 0;
@@ -2704,7 +2711,7 @@
                          Name.startswith("avx512.mask.unpckl."))) {
       Value *Op0 = CI->getArgOperand(0);
       Value *Op1 = CI->getArgOperand(1);
-      int NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      int NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
       int NumLaneElts = 128/CI->getType()->getScalarSizeInBits();
 
       SmallVector<int, 64> Idxs(NumElts);
@@ -2720,7 +2727,7 @@
                          Name.startswith("avx512.mask.unpckh."))) {
       Value *Op0 = CI->getArgOperand(0);
       Value *Op1 = CI->getArgOperand(1);
-      int NumElts = cast<VectorType>(CI->getType())->getNumElements();
+      int NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
       int NumLaneElts = 128/CI->getType()->getScalarSizeInBits();
 
       SmallVector<int, 64> Idxs(NumElts);
@@ -3288,7 +3295,7 @@
         Rep = Builder.CreateCall(Intrinsic::getDeclaration(F->getParent(), IID),
                                  Ops);
       } else {
-        int NumElts = cast<VectorType>(CI->getType())->getNumElements();
+        int NumElts = cast<FixedVectorType>(CI->getType())->getNumElements();
 
         Value *Ops[] = { CI->getArgOperand(0), CI->getArgOperand(1),
                          CI->getArgOperand(2) };
diff --git a/llvm/lib/IR/ConstantFold.cpp b/llvm/lib/IR/ConstantFold.cpp
--- a/llvm/lib/IR/ConstantFold.cpp
+++ b/llvm/lib/IR/ConstantFold.cpp
@@ -55,8 +55,8 @@
   // If this cast changes element count then we can't handle it here:
   // doing so requires endianness information.  This should be handled by
   // Analysis/ConstantFolding.cpp
-  unsigned NumElts = DstTy->getNumElements();
-  if (NumElts != cast<VectorType>(CV->getType())->getNumElements())
+  unsigned NumElts = cast<FixedVectorType>(DstTy)->getNumElements();
+  if (NumElts != cast<FixedVectorType>(CV->getType())->getNumElements())
     return nullptr;
 
   Type *DstEltTy = DstTy->getElementType();
@@ -573,8 +573,8 @@
   // count may be mismatched; don't attempt to handle that here.
   if ((isa<ConstantVector>(V) || isa<ConstantDataVector>(V)) &&
       DestTy->isVectorTy() &&
-      cast<VectorType>(DestTy)->getNumElements() ==
-          cast<VectorType>(V->getType())->getNumElements()) {
+      cast<FixedVectorType>(DestTy)->getNumElements() ==
+          cast<FixedVectorType>(V->getType())->getNumElements()) {
     VectorType *DestVecTy = cast<VectorType>(DestTy);
     Type *DstEltTy = DestVecTy->getElementType();
     // Fast path for splatted constants.
@@ -585,7 +585,8 @@
     }
     SmallVector<Constant *, 16> res;
     Type *Ty = IntegerType::get(V->getContext(), 32);
-    for (unsigned i = 0, e = cast<VectorType>(V->getType())->getNumElements();
+    for (unsigned i = 0,
+                  e = cast<FixedVectorType>(V->getType())->getNumElements();
          i != e; ++i) {
       Constant *C =
         ConstantExpr::getExtractElement(V, ConstantInt::get(Ty, i));
@@ -748,7 +749,7 @@
 
   // If the condition is a vector constant, fold the result elementwise.
   if (ConstantVector *CondV = dyn_cast<ConstantVector>(Cond)) {
-    auto *V1VTy = CondV->getType();
+    auto *V1VTy = cast<FixedVectorType>(CondV->getType());
     SmallVector<Constant*, 16> Result;
     Type *Ty = IntegerType::get(CondV->getContext(), 32);
     for (unsigned i = 0, e = V1VTy->getNumElements(); i != e; ++i) {
@@ -798,7 +799,7 @@
 
 Constant *llvm::ConstantFoldExtractElementInstruction(Constant *Val,
                                                       Constant *Idx) {
-  auto *ValVTy = cast<VectorType>(Val->getType());
+  auto *ValVTy = cast<FixedVectorType>(Val->getType());
 
   // extractelt undef, C -> undef
   // extractelt C, undef -> undef
@@ -851,7 +852,7 @@
   if (isa<ScalableVectorType>(ValTy))
     return nullptr;
 
-  unsigned NumElts = cast<VectorType>(Val->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Val->getType())->getNumElements();
   if (CIdx->uge(NumElts))
     return UndefValue::get(Val->getType());
 
@@ -898,7 +899,7 @@
   if (isa<ScalableVectorType>(V1VTy))
     return nullptr;
 
-  unsigned SrcNumElts = V1VTy->getNumElements();
+  unsigned SrcNumElts = cast<FixedVectorType>(V1VTy)->getNumElements();
 
   // Loop over the shuffle mask, evaluating each element.
   SmallVector<Constant*, 32> Result;
@@ -1012,7 +1013,8 @@
 
     // Fold each element and create a vector constant from those constants.
     SmallVector<Constant*, 16> Result;
-    for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i) {
+    for (unsigned i = 0, e = cast<FixedVectorType>(VTy)->getNumElements();
+         i != e; ++i) {
       Constant *ExtractIdx = ConstantInt::get(Ty, i);
       Constant *Elt = ConstantExpr::getExtractElement(C, ExtractIdx);
 
@@ -1385,7 +1387,8 @@
     // Fold each element and create a vector constant from those constants.
     SmallVector<Constant*, 16> Result;
     Type *Ty = IntegerType::get(VTy->getContext(), 32);
-    for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i) {
+    for (unsigned i = 0, e = cast<FixedVectorType>(VTy)->getNumElements();
+         i != e; ++i) {
       Constant *ExtractIdx = ConstantInt::get(Ty, i);
       Constant *LHS = ConstantExpr::getExtractElement(C1, ExtractIdx);
       Constant *RHS = ConstantExpr::getExtractElement(C2, ExtractIdx);
@@ -2013,7 +2016,8 @@
     SmallVector<Constant*, 4> ResElts;
     Type *Ty = IntegerType::get(C1->getContext(), 32);
     // Compare the elements, producing an i1 result or constant expr.
-    for (unsigned i = 0, e = C1VTy->getNumElements(); i != e; ++i) {
+    for (unsigned i = 0, e = cast<FixedVectorType>(C1VTy)->getNumElements();
+         i != e; ++i) {
       Constant *C1E =
         ConstantExpr::getExtractElement(C1, ConstantInt::get(Ty, i));
       Constant *C2E =
@@ -2286,13 +2290,13 @@
       Type *OrigGEPTy = PointerType::get(Ty, PtrTy->getAddressSpace());
       Type *GEPTy = PointerType::get(Ty, PtrTy->getAddressSpace());
       if (VectorType *VT = dyn_cast<VectorType>(C->getType()))
-        GEPTy = VectorType::get(OrigGEPTy, VT->getNumElements());
+        GEPTy = VectorType::get(OrigGEPTy, VT);
 
       // The GEP returns a vector of pointers when one of more of
       // its arguments is a vector.
       for (unsigned i = 0, e = Idxs.size(); i != e; ++i) {
         if (auto *VT = dyn_cast<VectorType>(Idxs[i]->getType())) {
-          GEPTy = VectorType::get(OrigGEPTy, VT->getNumElements());
+          GEPTy = VectorType::get(OrigGEPTy, VT);
           break;
         }
       }
@@ -2499,19 +2503,19 @@
 
     if (!IsCurrIdxVector && IsPrevIdxVector)
       CurrIdx = ConstantDataVector::getSplat(
-          cast<VectorType>(PrevIdx->getType())->getNumElements(), CurrIdx);
+          cast<FixedVectorType>(PrevIdx->getType())->getNumElements(), CurrIdx);
 
     if (!IsPrevIdxVector && IsCurrIdxVector)
       PrevIdx = ConstantDataVector::getSplat(
-          cast<VectorType>(CurrIdx->getType())->getNumElements(), PrevIdx);
+          cast<FixedVectorType>(CurrIdx->getType())->getNumElements(), PrevIdx);
 
     Constant *Factor =
         ConstantInt::get(CurrIdx->getType()->getScalarType(), NumElements);
     if (UseVector)
       Factor = ConstantDataVector::getSplat(
           IsPrevIdxVector
-              ? cast<VectorType>(PrevIdx->getType())->getNumElements()
-              : cast<VectorType>(CurrIdx->getType())->getNumElements(),
+              ? cast<FixedVectorType>(PrevIdx->getType())->getNumElements()
+              : cast<FixedVectorType>(CurrIdx->getType())->getNumElements(),
           Factor);
 
     NewIdxs[i] = ConstantExpr::getSRem(CurrIdx, Factor);
@@ -2528,10 +2532,8 @@
     Type *ExtendedTy = Type::getIntNTy(Div->getContext(), CommonExtendedWidth);
     if (UseVector)
       ExtendedTy = VectorType::get(
-          ExtendedTy,
-          IsPrevIdxVector
-              ? cast<VectorType>(PrevIdx->getType())->getNumElements()
-              : cast<VectorType>(CurrIdx->getType())->getNumElements());
+          ExtendedTy, IsPrevIdxVector ? cast<VectorType>(PrevIdx->getType())
+                                      : cast<VectorType>(CurrIdx->getType()));
 
     if (!PrevIdx->getType()->isIntOrIntVectorTy(CommonExtendedWidth))
       PrevIdx = ConstantExpr::getSExt(PrevIdx, ExtendedTy);
diff --git a/llvm/lib/IR/Constants.cpp b/llvm/lib/IR/Constants.cpp
--- a/llvm/lib/IR/Constants.cpp
+++ b/llvm/lib/IR/Constants.cpp
@@ -161,7 +161,7 @@
 
   // Check that vectors don't contain 1
   if (auto *VTy = dyn_cast<VectorType>(this->getType())) {
-    unsigned NumElts = VTy->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(VTy)->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = this->getAggregateElement(i);
       if (!Elt || !Elt->isNotOneValue())
@@ -211,7 +211,7 @@
 
   // Check that vectors don't contain INT_MIN
   if (auto *VTy = dyn_cast<VectorType>(this->getType())) {
-    unsigned NumElts = VTy->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(VTy)->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = this->getAggregateElement(i);
       if (!Elt || !Elt->isNotMinSignedValue())
@@ -230,7 +230,8 @@
   auto *VTy = dyn_cast<VectorType>(getType());
   if (!VTy)
     return false;
-  for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i) {
+  for (unsigned i = 0, e = cast<FixedVectorType>(VTy)->getNumElements(); i != e;
+       ++i) {
     auto *CFP = dyn_cast_or_null<ConstantFP>(this->getAggregateElement(i));
     if (!CFP || !CFP->getValueAPF().isFiniteNonZero())
       return false;
@@ -306,7 +307,8 @@
 
 bool Constant::containsUndefElement() const {
   if (auto *VTy = dyn_cast<VectorType>(getType())) {
-    for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i)
+    for (unsigned i = 0, e = cast<FixedVectorType>(VTy)->getNumElements();
+         i != e; ++i)
       if (isa<UndefValue>(getAggregateElement(i)))
         return true;
   }
@@ -316,7 +318,8 @@
 
 bool Constant::containsConstantExpression() const {
   if (auto *VTy = dyn_cast<VectorType>(getType())) {
-    for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i)
+    for (unsigned i = 0, e = cast<FixedVectorType>(VTy)->getNumElements();
+         i != e; ++i)
       if (isa<ConstantExpr>(getAggregateElement(i)))
         return true;
   }
@@ -954,7 +957,7 @@
   Type *Ty = getType();
   if (auto *AT = dyn_cast<ArrayType>(Ty))
     return AT->getNumElements();
-  if (auto *VT = dyn_cast<VectorType>(Ty))
+  if (auto *VT = dyn_cast<FixedVectorType>(Ty))
     return VT->getNumElements();
   return Ty->getStructNumElements();
 }
@@ -989,7 +992,7 @@
   Type *Ty = getType();
   if (auto *AT = dyn_cast<ArrayType>(Ty))
     return AT->getNumElements();
-  if (auto *VT = dyn_cast<VectorType>(Ty))
+  if (auto *VT = dyn_cast<FixedVectorType>(Ty))
     return VT->getNumElements();
   return Ty->getStructNumElements();
 }
@@ -1172,7 +1175,7 @@
 
 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
     : ConstantAggregate(T, ConstantVectorVal, V) {
-  assert(V.size() == T->getNumElements() &&
+  assert(V.size() == cast<FixedVectorType>(T)->getNumElements() &&
          "Invalid initializer for constant vector");
 }
 
@@ -1897,8 +1900,8 @@
          "PtrToInt destination must be integer or integer vector");
   assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
   if (auto *CVTy = dyn_cast<VectorType>(C->getType()))
-    assert(CVTy->getNumElements() ==
-               cast<VectorType>(DstTy)->getNumElements() &&
+    assert(CVTy->getElementCount() ==
+               cast<VectorType>(DstTy)->getElementCount() &&
            "Invalid cast between a different number of vector elements");
   return getFoldedCast(Instruction::PtrToInt, C, DstTy, OnlyIfReduced);
 }
@@ -1911,8 +1914,8 @@
          "IntToPtr destination must be a pointer or pointer vector");
   assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
   if (auto *CVTy = dyn_cast<VectorType>(C->getType()))
-    assert(CVTy->getNumElements() ==
-               cast<VectorType>(DstTy)->getNumElements() &&
+    assert(CVTy->getElementCount() ==
+               cast<VectorType>(DstTy)->getElementCount() &&
            "Invalid cast between a different number of vector elements");
   return getFoldedCast(Instruction::IntToPtr, C, DstTy, OnlyIfReduced);
 }
@@ -1943,7 +1946,7 @@
     Type *MidTy = PointerType::get(DstElemTy, SrcScalarTy->getAddressSpace());
     if (VectorType *VT = dyn_cast<VectorType>(DstTy)) {
       // Handle vectors of pointers.
-      MidTy = VectorType::get(MidTy, VT->getNumElements());
+      MidTy = VectorType::get(MidTy, VT);
     }
     C = getBitCast(C, MidTy);
   }
@@ -2579,7 +2582,7 @@
 unsigned ConstantDataSequential::getNumElements() const {
   if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
     return AT->getNumElements();
-  return cast<VectorType>(getType())->getNumElements();
+  return cast<FixedVectorType>(getType())->getNumElements();
 }
 
 
diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -557,9 +557,9 @@
   } else if (AlignType == VECTOR_ALIGN) {
     // By default, use natural alignment for vector types. This is consistent
     // with what clang and llvm-gcc do.
-    unsigned Alignment =
-        getTypeAllocSize(cast<VectorType>(Ty)->getElementType());
-    Alignment *= cast<VectorType>(Ty)->getNumElements();
+    auto *FVTy = cast<FixedVectorType>(Ty);
+    unsigned Alignment = getTypeAllocSize(FVTy->getElementType());
+    Alignment *= FVTy->getNumElements();
     Alignment = PowerOf2Ceil(Alignment);
     return Align(Alignment);
    }
@@ -788,7 +788,7 @@
   unsigned NumBits = getPointerTypeSizeInBits(Ty);
   IntegerType *IntTy = IntegerType::get(Ty->getContext(), NumBits);
   if (VectorType *VecTy = dyn_cast<VectorType>(Ty))
-    return VectorType::get(IntTy, VecTy->getNumElements());
+    return VectorType::get(IntTy, VecTy);
   return IntTy;
 }
 
@@ -810,7 +810,7 @@
   unsigned NumBits = getIndexTypeSizeInBits(Ty);
   IntegerType *IntTy = IntegerType::get(Ty->getContext(), NumBits);
   if (VectorType *VecTy = dyn_cast<VectorType>(Ty))
-    return VectorType::get(IntTy, VecTy->getNumElements());
+    return VectorType::get(IntTy, VecTy);
   return IntTy;
 }
 
diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -646,7 +646,7 @@
   } else if (VectorType* VTy = dyn_cast<VectorType>(Ty)) {
     if (isa<ScalableVectorType>(VTy))
       Result += "nx";
-    Result += "v" + utostr(VTy->getNumElements()) +
+    Result += "v" + utostr(VTy->getElementCount().Min) +
               getMangledTypeStr(VTy->getElementType());
   } else if (Ty) {
     switch (Ty->getTypeID()) {
@@ -1075,7 +1075,9 @@
     return Tys[D.getOverloadArgNumber()];
   case IITDescriptor::ScalableVecArgument: {
     auto *Ty = cast<VectorType>(DecodeFixedType(Infos, Tys, Context));
-    return VectorType::get(Ty->getElementType(), {Ty->getNumElements(), true});
+    // FIXME: will Ty ever not have getElementCount().Scalable == false?
+    return VectorType::get(Ty->getElementType(),
+                           {Ty->getElementCount().Min, true});
   }
   }
   llvm_unreachable("unhandled");
@@ -1180,7 +1182,8 @@
     case IITDescriptor::Integer: return !Ty->isIntegerTy(D.Integer_Width);
     case IITDescriptor::Vector: {
       VectorType *VT = dyn_cast<VectorType>(Ty);
-      return !VT || VT->getNumElements() != D.Vector_Width ||
+      return !VT ||
+             cast<FixedVectorType>(VT)->getNumElements() != D.Vector_Width ||
              matchIntrinsicType(VT->getElementType(), Infos, ArgTys,
                                 DeferredChecks, IsDeferredCheck);
     }
@@ -1325,7 +1328,7 @@
       VectorType *ReferenceType = dyn_cast<VectorType>(ArgTys[RefArgNumber]);
       VectorType *ThisArgVecTy = dyn_cast<VectorType>(Ty);
       if (!ThisArgVecTy || !ReferenceType ||
-          (ReferenceType->getNumElements() != ThisArgVecTy->getNumElements()))
+          (ReferenceType->getElementCount() != ThisArgVecTy->getElementCount()))
         return true;
       PointerType *ThisArgEltTy =
           dyn_cast<PointerType>(ThisArgVecTy->getElementType());
diff --git a/llvm/lib/IR/IRBuilder.cpp b/llvm/lib/IR/IRBuilder.cpp
--- a/llvm/lib/IR/IRBuilder.cpp
+++ b/llvm/lib/IR/IRBuilder.cpp
@@ -524,12 +524,11 @@
                                             const Twine &Name) {
   auto PtrsTy = cast<VectorType>(Ptrs->getType());
   auto PtrTy = cast<PointerType>(PtrsTy->getElementType());
-  unsigned NumElts = PtrsTy->getNumElements();
-  Type *DataTy = VectorType::get(PtrTy->getElementType(), NumElts);
+  Type *DataTy = VectorType::get(PtrTy->getElementType(), PtrsTy);
 
   if (!Mask)
-    Mask = Constant::getAllOnesValue(VectorType::get(Type::getInt1Ty(Context),
-                                     NumElts));
+    Mask = Constant::getAllOnesValue(
+        VectorType::get(Type::getInt1Ty(Context), PtrsTy));
 
   if (!PassThru)
     PassThru = UndefValue::get(DataTy);
@@ -554,18 +553,17 @@
                                              Align Alignment, Value *Mask) {
   auto PtrsTy = cast<VectorType>(Ptrs->getType());
   auto DataTy = cast<VectorType>(Data->getType());
-  unsigned NumElts = PtrsTy->getNumElements();
 
 #ifndef NDEBUG
   auto PtrTy = cast<PointerType>(PtrsTy->getElementType());
-  assert(NumElts == DataTy->getNumElements() &&
+  assert(PtrsTy->getElementCount() == DataTy->getElementCount() &&
          PtrTy->getElementType() == DataTy->getElementType() &&
          "Incompatible pointer and data types");
 #endif
 
   if (!Mask)
-    Mask = Constant::getAllOnesValue(VectorType::get(Type::getInt1Ty(Context),
-                                     NumElts));
+    Mask = Constant::getAllOnesValue(
+        VectorType::get(Type::getInt1Ty(Context), PtrsTy));
 
   Type *OverloadedTypes[] = {DataTy, PtrsTy};
   Value *Ops[] = {Data, Ptrs, getInt32(Alignment.value()), Mask};
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
@@ -90,7 +90,7 @@
     VectorType *ET = dyn_cast<VectorType>(Op1->getType());
     if (!ET)
       return "selected values for vector select must be vectors";
-    if (ET->getNumElements() != VT->getNumElements())
+    if (ET->getElementCount() != VT->getElementCount())
       return "vector select requires selected vectors to have "
                    "the same vector length as select condition";
   } else if (Op0->getType() != Type::getInt1Ty(Op0->getContext())) {
@@ -1907,7 +1907,7 @@
 }
 
 void ShuffleVectorInst::commute() {
-  int NumOpElts = cast<VectorType>(Op<0>()->getType())->getNumElements();
+  int NumOpElts = cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
   int NumMaskElts = ShuffleMask.size();
   SmallVector<int, 16> NewMask(NumMaskElts);
   for (int i = 0; i != NumMaskElts; ++i) {
@@ -1931,7 +1931,7 @@
     return false;
 
   // Make sure the mask elements make sense.
-  int V1Size = cast<VectorType>(V1->getType())->getNumElements();
+  int V1Size = cast<FixedVectorType>(V1->getType())->getNumElements();
   for (int Elem : Mask)
     if (Elem != UndefMaskElem && Elem >= V1Size * 2)
       return false;
@@ -1961,7 +1961,7 @@
     return true;
 
   if (const auto *MV = dyn_cast<ConstantVector>(Mask)) {
-    unsigned V1Size = cast<VectorType>(V1->getType())->getNumElements();
+    unsigned V1Size = cast<FixedVectorType>(V1->getType())->getNumElements();
     for (Value *Op : MV->operands()) {
       if (auto *CI = dyn_cast<ConstantInt>(Op)) {
         if (CI->uge(V1Size*2))
@@ -1974,8 +1974,9 @@
   }
 
   if (const auto *CDS = dyn_cast<ConstantDataSequential>(Mask)) {
-    unsigned V1Size = cast<VectorType>(V1->getType())->getNumElements();
-    for (unsigned i = 0, e = MaskTy->getNumElements(); i != e; ++i)
+    unsigned V1Size = cast<FixedVectorType>(V1->getType())->getNumElements();
+    for (unsigned i = 0, e = cast<FixedVectorType>(MaskTy)->getNumElements();
+         i != e; ++i)
       if (CDS->getElementAsInteger(i) >= V1Size*2)
         return false;
     return true;
@@ -2171,8 +2172,8 @@
 }
 
 bool ShuffleVectorInst::isIdentityWithPadding() const {
-  int NumOpElts = cast<VectorType>(Op<0>()->getType())->getNumElements();
-  int NumMaskElts = cast<VectorType>(getType())->getNumElements();
+  int NumOpElts = cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
+  int NumMaskElts = cast<FixedVectorType>(getType())->getNumElements();
   if (NumMaskElts <= NumOpElts)
     return false;
 
@@ -2190,8 +2191,8 @@
 }
 
 bool ShuffleVectorInst::isIdentityWithExtract() const {
-  int NumOpElts = cast<VectorType>(Op<0>()->getType())->getNumElements();
-  int NumMaskElts = getType()->getNumElements();
+  int NumOpElts = cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
+  int NumMaskElts = cast<FixedVectorType>(getType())->getNumElements();
   if (NumMaskElts >= NumOpElts)
     return false;
 
@@ -2203,8 +2204,8 @@
   if (isa<UndefValue>(Op<0>()) || isa<UndefValue>(Op<1>()))
     return false;
 
-  int NumOpElts = cast<VectorType>(Op<0>()->getType())->getNumElements();
-  int NumMaskElts = getType()->getNumElements();
+  int NumOpElts = cast<FixedVectorType>(Op<0>()->getType())->getNumElements();
+  int NumMaskElts = cast<FixedVectorType>(getType())->getNumElements();
   if (NumMaskElts != NumOpElts * 2)
     return false;
 
@@ -2945,8 +2946,8 @@
          "Invalid cast");
   assert(Ty->isVectorTy() == S->getType()->isVectorTy() && "Invalid cast");
   assert((!Ty->isVectorTy() ||
-          cast<VectorType>(Ty)->getNumElements() ==
-              cast<VectorType>(S->getType())->getNumElements()) &&
+          cast<VectorType>(Ty)->getElementCount() ==
+              cast<VectorType>(S->getType())->getElementCount()) &&
          "Invalid cast");
 
   if (Ty->isIntOrIntVectorTy())
@@ -2964,8 +2965,8 @@
          "Invalid cast");
   assert(Ty->isVectorTy() == S->getType()->isVectorTy() && "Invalid cast");
   assert((!Ty->isVectorTy() ||
-          cast<VectorType>(Ty)->getNumElements() ==
-              cast<VectorType>(S->getType())->getNumElements()) &&
+          cast<VectorType>(Ty)->getElementCount() ==
+              cast<VectorType>(S->getType())->getElementCount()) &&
          "Invalid cast");
 
   if (Ty->isIntOrIntVectorTy())
@@ -3076,7 +3077,7 @@
 
   if (VectorType *SrcVecTy = dyn_cast<VectorType>(SrcTy))
     if (VectorType *DestVecTy = dyn_cast<VectorType>(DestTy))
-      if (SrcVecTy->getNumElements() == DestVecTy->getNumElements()) {
+      if (SrcVecTy->getElementCount() == DestVecTy->getElementCount()) {
         // An element by element cast.  Valid if casting the elements is valid.
         SrcTy = SrcVecTy->getElementType();
         DestTy = DestVecTy->getElementType();
@@ -3198,7 +3199,7 @@
   // FIXME: Check address space sizes here
   if (VectorType *SrcVecTy = dyn_cast<VectorType>(SrcTy))
     if (VectorType *DestVecTy = dyn_cast<VectorType>(DestTy))
-      if (SrcVecTy->getNumElements() == DestVecTy->getNumElements()) {
+      if (SrcVecTy->getElementCount() == DestVecTy->getElementCount()) {
         // An element by element cast.  Find the appropriate opcode based on the
         // element types.
         SrcTy = SrcVecTy->getElementType();
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -2683,8 +2683,8 @@
          &I);
 
   if (SrcVec && DstVec)
-    Assert(cast<VectorType>(SrcTy)->getNumElements() ==
-               cast<VectorType>(DestTy)->getNumElements(),
+    Assert(cast<VectorType>(SrcTy)->getElementCount() ==
+               cast<VectorType>(DestTy)->getElementCount(),
            "UIToFP source and dest vector length mismatch", &I);
 
   visitInstruction(I);
@@ -2706,8 +2706,8 @@
          &I);
 
   if (SrcVec && DstVec)
-    Assert(cast<VectorType>(SrcTy)->getNumElements() ==
-               cast<VectorType>(DestTy)->getNumElements(),
+    Assert(cast<VectorType>(SrcTy)->getElementCount() ==
+               cast<VectorType>(DestTy)->getElementCount(),
            "SIToFP source and dest vector length mismatch", &I);
 
   visitInstruction(I);
@@ -2729,8 +2729,8 @@
          "FPToUI result must be integer or integer vector", &I);
 
   if (SrcVec && DstVec)
-    Assert(cast<VectorType>(SrcTy)->getNumElements() ==
-               cast<VectorType>(DestTy)->getNumElements(),
+    Assert(cast<VectorType>(SrcTy)->getElementCount() ==
+               cast<VectorType>(DestTy)->getElementCount(),
            "FPToUI source and dest vector length mismatch", &I);
 
   visitInstruction(I);
@@ -2752,8 +2752,8 @@
          "FPToSI result must be integer or integer vector", &I);
 
   if (SrcVec && DstVec)
-    Assert(cast<VectorType>(SrcTy)->getNumElements() ==
-               cast<VectorType>(DestTy)->getNumElements(),
+    Assert(cast<VectorType>(SrcTy)->getElementCount() ==
+               cast<VectorType>(DestTy)->getElementCount(),
            "FPToSI source and dest vector length mismatch", &I);
 
   visitInstruction(I);
@@ -2777,7 +2777,7 @@
   if (SrcTy->isVectorTy()) {
     VectorType *VSrc = cast<VectorType>(SrcTy);
     VectorType *VDest = cast<VectorType>(DestTy);
-    Assert(VSrc->getNumElements() == VDest->getNumElements(),
+    Assert(VSrc->getElementCount() == VDest->getElementCount(),
            "PtrToInt Vector width mismatch", &I);
   }
 
@@ -2802,7 +2802,7 @@
   if (SrcTy->isVectorTy()) {
     VectorType *VSrc = cast<VectorType>(SrcTy);
     VectorType *VDest = cast<VectorType>(DestTy);
-    Assert(VSrc->getNumElements() == VDest->getNumElements(),
+    Assert(VSrc->getElementCount() == VDest->getElementCount(),
            "IntToPtr Vector width mismatch", &I);
   }
   visitInstruction(I);
@@ -2826,8 +2826,8 @@
   Assert(SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace(),
          "AddrSpaceCast must be between different address spaces", &I);
   if (auto *SrcVTy = dyn_cast<VectorType>(SrcTy))
-    Assert(SrcVTy->getNumElements() ==
-               cast<VectorType>(DestTy)->getNumElements(),
+    Assert(SrcVTy->getElementCount() ==
+               cast<VectorType>(DestTy)->getElementCount(),
            "AddrSpaceCast vector pointer number of elements mismatch", &I);
   visitInstruction(I);
 }
@@ -3336,16 +3336,16 @@
 
   if (auto *GEPVTy = dyn_cast<VectorType>(GEP.getType())) {
     // Additional checks for vector GEPs.
-    unsigned GEPWidth = GEPVTy->getNumElements();
+    ElementCount GEPWidth = GEPVTy->getElementCount();
     if (GEP.getPointerOperandType()->isVectorTy())
       Assert(
           GEPWidth ==
-              cast<VectorType>(GEP.getPointerOperandType())->getNumElements(),
+              cast<VectorType>(GEP.getPointerOperandType())->getElementCount(),
           "Vector GEP result width doesn't match operand's", &GEP);
     for (Value *Idx : Idxs) {
       Type *IndexTy = Idx->getType();
       if (auto *IndexVTy = dyn_cast<VectorType>(IndexTy)) {
-        unsigned IndexWidth = IndexVTy->getNumElements();
+        ElementCount IndexWidth = IndexVTy->getElementCount();
         Assert(IndexWidth == GEPWidth, "Invalid GEP index vector width", &GEP);
       }
       Assert(IndexTy->isIntOrIntVectorTy(),
@@ -4659,8 +4659,8 @@
            "masked_load: return must match pointer type", Call);
     Assert(PassThru->getType() == DataTy,
            "masked_load: pass through and data type must match", Call);
-    Assert(cast<VectorType>(Mask->getType())->getNumElements() ==
-               cast<VectorType>(DataTy)->getNumElements(),
+    Assert(cast<VectorType>(Mask->getType())->getElementCount() ==
+               cast<VectorType>(DataTy)->getElementCount(),
            "masked_load: vector mask must be same length as data", Call);
     break;
   }
@@ -4678,8 +4678,8 @@
     Type *DataTy = cast<PointerType>(Ptr->getType())->getElementType();
     Assert(DataTy == Val->getType(),
            "masked_store: storee must match pointer type", Call);
-    Assert(cast<VectorType>(Mask->getType())->getNumElements() ==
-               cast<VectorType>(DataTy)->getNumElements(),
+    Assert(cast<VectorType>(Mask->getType())->getElementCount() ==
+               cast<VectorType>(DataTy)->getElementCount(),
            "masked_store: vector mask must be same length as data", Call);
     break;
   }
@@ -4799,27 +4799,27 @@
   case Intrinsic::matrix_columnwise_store: {
     ConstantInt *NumRows;
     ConstantInt *NumColumns;
-    VectorType *TypeToCheck;
+    FixedVectorType *TypeToCheck;
     switch (ID) {
     case Intrinsic::matrix_multiply:
       NumRows = cast<ConstantInt>(Call.getArgOperand(2));
       NumColumns = cast<ConstantInt>(Call.getArgOperand(4));
-      TypeToCheck = cast<VectorType>(Call.getType());
+      TypeToCheck = cast<FixedVectorType>(Call.getType());
       break;
     case Intrinsic::matrix_transpose:
       NumRows = cast<ConstantInt>(Call.getArgOperand(1));
       NumColumns = cast<ConstantInt>(Call.getArgOperand(2));
-      TypeToCheck = cast<VectorType>(Call.getType());
+      TypeToCheck = cast<FixedVectorType>(Call.getType());
       break;
     case Intrinsic::matrix_columnwise_load:
       NumRows = cast<ConstantInt>(Call.getArgOperand(2));
       NumColumns = cast<ConstantInt>(Call.getArgOperand(3));
-      TypeToCheck = cast<VectorType>(Call.getType());
+      TypeToCheck = cast<FixedVectorType>(Call.getType());
       break;
     case Intrinsic::matrix_columnwise_store:
       NumRows = cast<ConstantInt>(Call.getArgOperand(3));
       NumColumns = cast<ConstantInt>(Call.getArgOperand(4));
-      TypeToCheck = cast<VectorType>(Call.getArgOperand(0)->getType());
+      TypeToCheck = cast<FixedVectorType>(Call.getArgOperand(0)->getType());
       break;
     default:
       llvm_unreachable("unexpected intrinsic");
@@ -4901,20 +4901,20 @@
   case Intrinsic::experimental_constrained_fptosi:
   case Intrinsic::experimental_constrained_fptoui: {
     Value *Operand = FPI.getArgOperand(0);
-    uint64_t NumSrcElem = 0;
+    Optional<ElementCount> NumSrcElem;
     Assert(Operand->getType()->isFPOrFPVectorTy(),
            "Intrinsic first argument must be floating point", &FPI);
     if (auto *OperandT = dyn_cast<VectorType>(Operand->getType())) {
-      NumSrcElem = OperandT->getNumElements();
+      NumSrcElem = OperandT->getElementCount();
     }
 
     Operand = &FPI;
-    Assert((NumSrcElem > 0) == Operand->getType()->isVectorTy(),
+    Assert(NumSrcElem.hasValue() == Operand->getType()->isVectorTy(),
            "Intrinsic first argument and result disagree on vector use", &FPI);
     Assert(Operand->getType()->isIntOrIntVectorTy(),
            "Intrinsic result must be an integer", &FPI);
     if (auto *OperandT = dyn_cast<VectorType>(Operand->getType())) {
-      Assert(NumSrcElem == OperandT->getNumElements(),
+      Assert(*NumSrcElem == OperandT->getElementCount(),
              "Intrinsic first argument and result vector lengths must be equal",
              &FPI);
     }
@@ -4924,20 +4924,20 @@
   case Intrinsic::experimental_constrained_sitofp:
   case Intrinsic::experimental_constrained_uitofp: {
     Value *Operand = FPI.getArgOperand(0);
-    uint64_t NumSrcElem = 0;
+    Optional<ElementCount> NumSrcElem;
     Assert(Operand->getType()->isIntOrIntVectorTy(),
            "Intrinsic first argument must be integer", &FPI);
     if (auto *OperandT = dyn_cast<VectorType>(Operand->getType())) {
-      NumSrcElem = OperandT->getNumElements();
+      NumSrcElem = OperandT->getElementCount();
     }
 
     Operand = &FPI;
-    Assert((NumSrcElem > 0) == Operand->getType()->isVectorTy(),
+    Assert(NumSrcElem.hasValue() == Operand->getType()->isVectorTy(),
            "Intrinsic first argument and result disagree on vector use", &FPI);
     Assert(Operand->getType()->isFPOrFPVectorTy(),
            "Intrinsic result must be a floating point", &FPI);
     if (auto *OperandT = dyn_cast<VectorType>(Operand->getType())) {
-      Assert(NumSrcElem == OperandT->getNumElements(),
+      Assert(*NumSrcElem == OperandT->getElementCount(),
              "Intrinsic first argument and result vector lengths must be equal",
              &FPI);
     }
@@ -4958,7 +4958,7 @@
     if (OperandTy->isVectorTy()) {
       auto *OperandVecTy = cast<VectorType>(OperandTy);
       auto *ResultVecTy = cast<VectorType>(ResultTy);
-      Assert(OperandVecTy->getNumElements() == ResultVecTy->getNumElements(),
+      Assert(OperandVecTy->getElementCount() == ResultVecTy->getElementCount(),
              "Intrinsic first argument and result vector lengths must be equal",
              &FPI);
     }