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Cost model: Add check for reverse shuffles to CostModel analysis

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Check for reverse shuffles in the CostModel analysis pass and query
TargetTransform info accordingly. This allows us we can write test cases for
reverse shuffles.

radar://13171406

llvm-svn: 174932
This commit is contained in:
Arnold Schwaighofer 2013-02-12 02:40:37 +00:00
parent 1ecca5fd68
commit fafd6a4d28
1 changed files with 18 additions and 0 deletions
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18
lib/Analysis/CostModel.cpp
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@ -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;