diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -2689,15 +2689,16 @@
                                         const DataLayout &DL,
                                         const TargetLibraryInfo *TLI,
                                         const CallBase *Call) {
-  SmallVector<Constant *, 4> Result(VTy->getNumElements());
-  SmallVector<Constant *, 4> Lane(Operands.size());
-  Type *Ty = VTy->getElementType();
-
   // Do not iterate on scalable vector. The number of elements is unknown at
   // compile-time.
   if (isa<ScalableVectorType>(VTy))
     return nullptr;
 
+  SmallVector<Constant *, 4> Result(
+      cast<FixedVectorType>(VTy)->getNumElements());
+  SmallVector<Constant *, 4> Lane(Operands.size());
+  Type *Ty = VTy->getElementType();
+
   if (IntrinsicID == Intrinsic::masked_load) {
     auto *SrcPtr = Operands[0];
     auto *Mask = Operands[2];