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Extract the logic for inserting a subvector into a vector alloca.
No functionality changed. Another step of refactoring toward solving PR14487. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170300 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2506,6 +2506,52 @@ private:
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return !LI.isVolatile() && !IsPtrAdjusted;
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}
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Value *insertVector(IRBuilder<> &IRB, Value *V,
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unsigned BeginIndex, unsigned EndIndex) {
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assert(VecTy && "Can only insert a vector into a vector alloca");
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unsigned NumElements = EndIndex - BeginIndex;
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assert(NumElements <= VecTy->getNumElements() && "Too many elements!");
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if (NumElements == VecTy->getNumElements())
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return convertValue(TD, IRB, V, VecTy);
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LoadInst *LI = IRB.CreateAlignedLoad(&NewAI, NewAI.getAlignment(),
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getName(".load"));
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if (NumElements == 1) {
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V = IRB.CreateInsertElement(LI, V, IRB.getInt32(BeginIndex),
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getName(".insert"));
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DEBUG(dbgs() << " insert: " << *V << "\n");
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return V;
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}
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// When inserting a smaller vector into the larger to store, we first
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// use a shuffle vector to widen it with undef elements, and then
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// a second shuffle vector to select between the loaded vector and the
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// incoming vector.
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SmallVector<Constant*, 8> Mask;
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Mask.reserve(VecTy->getNumElements());
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for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
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if (i >= BeginIndex && i < EndIndex)
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Mask.push_back(IRB.getInt32(i - BeginIndex));
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else
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Mask.push_back(UndefValue::get(IRB.getInt32Ty()));
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V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
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ConstantVector::get(Mask),
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getName(".expand"));
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DEBUG(dbgs() << " shuffle1: " << *V << "\n");
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Mask.clear();
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for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
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if (i >= BeginIndex && i < EndIndex)
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Mask.push_back(IRB.getInt32(i));
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else
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Mask.push_back(IRB.getInt32(i + VecTy->getNumElements()));
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V = IRB.CreateShuffleVector(V, LI, ConstantVector::get(Mask),
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getName("insert"));
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DEBUG(dbgs() << " shuffle2: " << *V << "\n");
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return V;
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}
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bool rewriteVectorizedStoreInst(IRBuilder<> &IRB, Value *V,
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StoreInst &SI, Value *OldOp) {
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unsigned BeginIndex = getIndex(BeginOffset);
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@ -2518,44 +2564,10 @@ private:
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: VectorType::get(ElementTy, NumElements);
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if (V->getType() != PartitionTy)
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V = convertValue(TD, IRB, V, PartitionTy);
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if (NumElements < VecTy->getNumElements()) {
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// We need to mix in the existing elements.
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LoadInst *LI = IRB.CreateAlignedLoad(&NewAI, NewAI.getAlignment(),
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getName(".load"));
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if (NumElements == 1) {
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V = IRB.CreateInsertElement(LI, V, IRB.getInt32(BeginIndex),
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getName(".insert"));
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DEBUG(dbgs() << " insert: " << *V << "\n");
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} else {
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// When inserting a smaller vector into the larger to store, we first
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// use a shuffle vector to widen it with undef elements, and then
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// a second shuffle vector to select between the loaded vector and the
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// incoming vector.
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SmallVector<Constant*, 8> Mask;
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Mask.reserve(VecTy->getNumElements());
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for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
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if (i >= BeginIndex && i < EndIndex)
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Mask.push_back(IRB.getInt32(i - BeginIndex));
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else
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Mask.push_back(UndefValue::get(IRB.getInt32Ty()));
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V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
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ConstantVector::get(Mask),
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getName(".expand"));
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DEBUG(dbgs() << " shuffle1: " << *V << "\n");
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Mask.clear();
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for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
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if (i >= BeginIndex && i < EndIndex)
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Mask.push_back(IRB.getInt32(i));
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else
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Mask.push_back(IRB.getInt32(i + VecTy->getNumElements()));
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V = IRB.CreateShuffleVector(V, LI, ConstantVector::get(Mask),
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getName("insert"));
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DEBUG(dbgs() << " shuffle2: " << *V << "\n");
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}
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} else {
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V = convertValue(TD, IRB, V, VecTy);
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}
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// Mix in the existing elements.
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V = insertVector(IRB, V, BeginIndex, EndIndex);
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StoreInst *Store = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment());
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Pass.DeadInsts.insert(&SI);
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