ARM Cost model: Use the size of vector registers and widest vectorizable instruction to determine the max vectorization factor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172010 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/BasicTargetTransformInfo.cpp

@@ -84,6 +84,7 @@ public:
 
   virtual unsigned getNumberOfRegisters(bool Vector) const;
   virtual unsigned getMaximumUnrollFactor() const;
+  virtual unsigned getRegisterBitWidth(bool Vector) const;
   virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
   virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
                                   int Index, Type *SubTp) const;
@@ -183,6 +184,10 @@ unsigned BasicTTI::getNumberOfRegisters(bool Vector) const {
   return 1;
 }
 
+unsigned BasicTTI::getRegisterBitWidth(bool Vector) const {
+  return 32;
+}
+
 unsigned BasicTTI::getMaximumUnrollFactor() const {
   return 1;
 }