diff options
| -rw-r--r-- | lib/Analysis/CostModel.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/Analysis/CostModel.cpp b/lib/Analysis/CostModel.cpp index 8435e39707..44684a9685 100644 --- a/lib/Analysis/CostModel.cpp +++ b/lib/Analysis/CostModel.cpp @@ -80,6 +80,13 @@ CostModelAnalysis::runOnFunction(Function &F) { 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; @@ -171,6 +178,17 @@ unsigned CostModelAnalysis::getInstructionCost(const Instruction *I) const { 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; |