Add isConditional for VPreductionRecipe.

Author: Mel-Chen

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -2172,14 +2172,18 @@ class VPReductionRecipe : public VPSingleDefRecipe {
   /// The recurrence decriptor for the reduction in question.
   const RecurrenceDescriptor &RdxDesc;
   bool IsOrdered;
+  /// Whether the reduction is conditional.
+  bool IsConditional = false;
 
 protected:
   VPReductionRecipe(const unsigned char SC, const RecurrenceDescriptor &R,
                     Instruction *I, ArrayRef<VPValue *> Operands,
                     VPValue *CondOp, bool IsOrdered)
       : VPSingleDefRecipe(SC, Operands, I), RdxDesc(R), IsOrdered(IsOrdered) {
-    if (CondOp)
+    if (CondOp) {
+      IsConditional = true;
       addOperand(CondOp);
+    }
   }
 
 public:
@@ -2222,13 +2226,15 @@ class VPReductionRecipe : public VPSingleDefRecipe {
   }
   /// Return true if the in-loop reduction is ordered.
   bool isOrdered() const { return IsOrdered; };
+  /// Return true if the in-loop reduction is conditional.
+  bool isConditional() const { return IsConditional; };
   /// The VPValue of the scalar Chain being accumulated.
   VPValue *getChainOp() const { return getOperand(0); }
   /// The VPValue of the vector value to be reduced.
   VPValue *getVecOp() const { return getOperand(1); }
   /// The VPValue of the condition for the block.
-  virtual VPValue *getCondOp() const {
-    return getNumOperands() > 2 ? getOperand(2) : nullptr;
+  VPValue *getCondOp() const {
+    return isConditional() ? getOperand(getNumOperands() - 1) : nullptr;
   }
 };
 
@@ -2264,10 +2270,6 @@ class VPReductionEVLRecipe : public VPReductionRecipe {
 
   /// The VPValue of the explicit vector length.
   VPValue *getEVL() const { return getOperand(2); }
-  /// The VPValue of the condition for the block.
-  VPValue *getCondOp() const override {
-    return getNumOperands() > 3 ? getOperand(3) : nullptr;
-  }
 
   /// Returns true if the recipe only uses the first lane of operand \p Op.
   bool onlyFirstLaneUsed(const VPValue *Op) const override {

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1799,7 +1799,7 @@ void VPReductionRecipe::print(raw_ostream &O, const Twine &Indent,
     O << getUnderlyingInstr()->getFastMathFlags();
   O << " reduce." << Instruction::getOpcodeName(RdxDesc.getOpcode()) << " (";
   getVecOp()->printAsOperand(O, SlotTracker);
-  if (getCondOp()) {
+  if (isConditional()) {
     O << ", ";
     getCondOp()->printAsOperand(O, SlotTracker);
   }
@@ -1823,7 +1823,7 @@ void VPReductionEVLRecipe::print(raw_ostream &O, const Twine &Indent,
   getVecOp()->printAsOperand(O, SlotTracker);
   O << ", ";
   getEVL()->printAsOperand(O, SlotTracker);
-  if (getCondOp()) {
+  if (isConditional()) {
     O << ", ";
     getCondOp()->printAsOperand(O, SlotTracker);
   }