Index: llvm/include/llvm/Analysis/TargetTransformInfo.h
===================================================================
--- llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -1329,6 +1329,9 @@
   /// to a stack reload.
   unsigned getGISelRematGlobalCost() const;
 
+  /// \returns True if the target supports scalable vectors.
+  bool supportsScalableVectors() const;
+
   /// \name Vector Predication Information
   /// @{
   /// Whether the target supports the %evl parameter of VP intrinsic efficiently
@@ -1622,6 +1625,7 @@
                                                ReductionFlags) const = 0;
   virtual bool shouldExpandReduction(const IntrinsicInst *II) const = 0;
   virtual unsigned getGISelRematGlobalCost() const = 0;
+  virtual bool supportsScalableVectors() const = 0;
   virtual bool hasActiveVectorLength() const = 0;
   virtual int getInstructionLatency(const Instruction *I) = 0;
 };
@@ -2148,6 +2152,10 @@
     return Impl.getGISelRematGlobalCost();
   }
 
+  bool supportsScalableVectors() const override {
+    return Impl.supportsScalableVectors();
+  }
+
   bool hasActiveVectorLength() const override {
     return Impl.hasActiveVectorLength();
   }
Index: llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
===================================================================
--- llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -683,6 +683,8 @@
 
   unsigned getGISelRematGlobalCost() const { return 1; }
 
+  bool supportsScalableVectors() const { return false; }
+
   bool hasActiveVectorLength() const { return false; }
 
 protected:
Index: llvm/lib/Analysis/TargetTransformInfo.cpp
===================================================================
--- llvm/lib/Analysis/TargetTransformInfo.cpp
+++ llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -1051,6 +1051,10 @@
   return TTIImpl->getGISelRematGlobalCost();
 }
 
+bool TargetTransformInfo::supportsScalableVectors() const {
+  return TTIImpl->supportsScalableVectors();
+}
+
 int TargetTransformInfo::getInstructionLatency(const Instruction *I) const {
   return TTIImpl->getInstructionLatency(I);
 }
Index: llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
===================================================================
--- llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
+++ llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
@@ -228,6 +228,8 @@
     return 2;
   }
 
+  bool supportsScalableVectors() const { return ST->hasSVE(); }
+
   bool useReductionIntrinsic(unsigned Opcode, Type *Ty,
                              TTI::ReductionFlags Flags) const;