+
+unsigned BasicTTI::getReductionCost(unsigned Opcode, Type *Ty,
+ bool IsPairwise) const {
+ assert(Ty->isVectorTy() && "Expect a vector type");
+ unsigned NumVecElts = Ty->getVectorNumElements();
+ unsigned NumReduxLevels = Log2_32(NumVecElts);
+ unsigned ArithCost = NumReduxLevels *
+ TopTTI->getArithmeticInstrCost(Opcode, Ty);
+ // Assume the pairwise shuffles add a cost.
+ unsigned ShuffleCost =
+ NumReduxLevels * (IsPairwise + 1) *
+ TopTTI->getShuffleCost(SK_ExtractSubvector, Ty, NumVecElts / 2, Ty);
+ return ShuffleCost + ArithCost + getScalarizationOverhead(Ty, false, true);
+}