return false;
}
+static bool isReverseVectorMask(SmallVector<int, 16> &Mask) {
+ for (unsigned i = 0, MaskSize = Mask.size(); i < MaskSize; ++i)
+ if (Mask[i] > 0 && Mask[i] != (int)(MaskSize - 1 - i))
+ return false;
+ return true;
+}
+
unsigned CostModelAnalysis::getInstructionCost(const Instruction *I) const {
if (!TTI)
return -1;
return TTI->getVectorInstrCost(I->getOpcode(),
IE->getType(), Idx);
}
+ case Instruction::ShuffleVector: {
+ const ShuffleVectorInst *Shuffle = cast<ShuffleVectorInst>(I);
+ Type *VecTypOp0 = Shuffle->getOperand(0)->getType();
+ unsigned NumVecElems = VecTypOp0->getVectorNumElements();
+ SmallVector<int, 16> Mask = Shuffle->getShuffleMask();
+
+ if (NumVecElems == Mask.size() && isReverseVectorMask(Mask))
+ return TTI->getShuffleCost(TargetTransformInfo::SK_Reverse, VecTypOp0, 0,
+ 0);
+ return -1;
+ }
default:
// We don't have any information on this instruction.
return -1;