[SLP] NFC. Use TreeEntry::getOperand if setOperandsInOrder is called (#92727)

already.

Author: HanKuanChen

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -6916,15 +6916,8 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
                                    std::nullopt, CurrentOrder);
       LLVM_DEBUG(dbgs() << "SLP: added inserts bundle.\n");
 
-      constexpr int NumOps = 2;
-      ValueList VectorOperands[NumOps];
-      for (int I = 0; I < NumOps; ++I) {
-        for (Value *V : VL)
-          VectorOperands[I].push_back(cast<Instruction>(V)->getOperand(I));
-
-        TE->setOperand(I, VectorOperands[I]);
-      }
-      buildTree_rec(VectorOperands[NumOps - 1], Depth + 1, {TE, NumOps - 1});
+      TE->setOperandsInOrder();
+      buildTree_rec(TE->getOperand(1), Depth + 1, {TE, 1});
       return;
     }
     case Instruction::Load: {
@@ -7024,14 +7017,8 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
       LLVM_DEBUG(dbgs() << "SLP: added a vector of casts.\n");
 
       TE->setOperandsInOrder();
-      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands())) {
-        ValueList Operands;
-        // Prepare the operand vector.
-        for (Value *V : VL)
-          Operands.push_back(cast<Instruction>(V)->getOperand(I));
-
-        buildTree_rec(Operands, Depth + 1, {TE, I});
-      }
+      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands()))
+        buildTree_rec(TE->getOperand(I), Depth + 1, {TE, I});
       return;
     }
     case Instruction::ICmp:
@@ -7116,14 +7103,8 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
       }
 
       TE->setOperandsInOrder();
-      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands())) {
-        ValueList Operands;
-        // Prepare the operand vector.
-        for (Value *V : VL)
-          Operands.push_back(cast<Instruction>(V)->getOperand(I));
-
-        buildTree_rec(Operands, Depth + 1, {TE, I});
-      }
+      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands()))
+        buildTree_rec(TE->getOperand(I), Depth + 1, {TE, I});
       return;
     }
     case Instruction::GetElementPtr: {
@@ -7182,30 +7163,17 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
       return;
     }
     case Instruction::Store: {
-      // Check if the stores are consecutive or if we need to swizzle them.
-      ValueList Operands(VL.size());
-      auto *OIter = Operands.begin();
-      for (Value *V : VL) {
-        auto *SI = cast<StoreInst>(V);
-        *OIter = SI->getValueOperand();
-        ++OIter;
-      }
-      // Check that the sorted pointer operands are consecutive.
-      if (CurrentOrder.empty()) {
-        // Original stores are consecutive and does not require reordering.
-        TreeEntry *TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
-                                     ReuseShuffleIndices);
-        TE->setOperandsInOrder();
-        buildTree_rec(Operands, Depth + 1, {TE, 0});
-        LLVM_DEBUG(dbgs() << "SLP: added a vector of stores.\n");
-      } else {
+      bool Consecutive = CurrentOrder.empty();
+      if (!Consecutive)
         fixupOrderingIndices(CurrentOrder);
-        TreeEntry *TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
-                                     ReuseShuffleIndices, CurrentOrder);
-        TE->setOperandsInOrder();
-        buildTree_rec(Operands, Depth + 1, {TE, 0});
+      TreeEntry *TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
+                                   ReuseShuffleIndices, CurrentOrder);
+      TE->setOperandsInOrder();
+      buildTree_rec(TE->getOperand(0), Depth + 1, {TE, 0});
+      if (Consecutive)
+        LLVM_DEBUG(dbgs() << "SLP: added a vector of stores.\n");
+      else
         LLVM_DEBUG(dbgs() << "SLP: added a vector of jumbled stores.\n");
-      }
       return;
     }
     case Instruction::Call: {
@@ -7305,14 +7273,8 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
       }
 
       TE->setOperandsInOrder();
-      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands())) {
-        ValueList Operands;
-        // Prepare the operand vector.
-        for (Value *V : VL)
-          Operands.push_back(cast<Instruction>(V)->getOperand(I));
-
-        buildTree_rec(Operands, Depth + 1, {TE, I});
-      }
+      for (unsigned I : seq<unsigned>(0, VL0->getNumOperands()))
+        buildTree_rec(TE->getOperand(I), Depth + 1, {TE, I});
       return;
     }
     default: