[VPlan] Make VPWidenMemoryInstructionRecipe a VPDef.

This patch updates VPWidenMemoryInstructionRecipe to use VPDef
to manage the value it produces instead of inheriting from VPValue.

Reviewed By: gilr

Differential Revision: https://reviews.llvm.org/D90563

lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -8827,11 +8827,10 @@ void VPPredInstPHIRecipe::execute(VPTransformState &State) {
 }
 
 void VPWidenMemoryInstructionRecipe::execute(VPTransformState &State) {
-  Instruction *Instr = getUnderlyingInstr();
-  VPValue *StoredValue = isa<StoreInst>(Instr) ? getStoredValue() : nullptr;
-  State.ILV->vectorizeMemoryInstruction(Instr, State,
-                                        StoredValue ? nullptr : this, getAddr(),
-                                        StoredValue, getMask());
+  VPValue *StoredValue = isStore() ? getStoredValue() : nullptr;
+  State.ILV->vectorizeMemoryInstruction(&Ingredient, State,
+                                        StoredValue ? nullptr : toVPValue(),
+                                        getAddr(), StoredValue, getMask());
 }
 
 // Determine how to lower the scalar epilogue, which depends on 1) optimising

lib/Transforms/Vectorize/VPlan.cpp

@@ -124,8 +124,12 @@ VPValue *VPRecipeBase::toVPValue() {
     return V;
   if (auto *V = dyn_cast<VPReductionRecipe>(this))
     return V;
-  if (auto *V = dyn_cast<VPWidenMemoryInstructionRecipe>(this))
-    return V;
+  if (auto *V = dyn_cast<VPWidenMemoryInstructionRecipe>(this)) {
+    if (!V->isStore())
+      return V->getVPValue();
+    else
+      return nullptr;
+  }
   if (auto *V = dyn_cast<VPWidenCallRecipe>(this))
     return V;
   if (auto *V = dyn_cast<VPWidenSelectRecipe>(this))
@@ -144,8 +148,12 @@ const VPValue *VPRecipeBase::toVPValue() const {
     return V;
   if (auto *V = dyn_cast<VPReductionRecipe>(this))
     return V;
-  if (auto *V = dyn_cast<VPWidenMemoryInstructionRecipe>(this))
-    return V;
+  if (auto *V = dyn_cast<VPWidenMemoryInstructionRecipe>(this)) {
+    if (!V->isStore())
+      return V->getVPValue();
+    else
+      return nullptr;
+  }
   if (auto *V = dyn_cast<VPWidenCallRecipe>(this))
     return V;
   if (auto *V = dyn_cast<VPWidenSelectRecipe>(this))
@@ -993,10 +1001,10 @@ void VPWidenMemoryInstructionRecipe::print(raw_ostream &O, const Twine &Indent,
   O << "\"WIDEN ";
 
   if (!isStore()) {
-    printAsOperand(O, SlotTracker);
+    getVPValue()->printAsOperand(O, SlotTracker);
     O << " = ";
   }
-  O << Instruction::getOpcodeName(getUnderlyingInstr()->getOpcode()) << " ";
+  O << Instruction::getOpcodeName(Ingredient.getOpcode()) << " ";
 
   printOperands(O, SlotTracker);
 }

lib/Transforms/Vectorize/VPlan.h

@@ -1265,8 +1265,9 @@ public:
 /// TODO: We currently execute only per-part unless a specific instance is
 /// provided.
 class VPWidenMemoryInstructionRecipe : public VPRecipeBase,
-                                       public VPValue,
+                                       public VPDef,
                                        public VPUser {
+  Instruction &Ingredient;
 
   void setMask(VPValue *Mask) {
     if (!Mask)
@@ -1280,16 +1281,16 @@ class VPWidenMemoryInstructionRecipe : public VPRecipeBase,
 
 public:
   VPWidenMemoryInstructionRecipe(LoadInst &Load, VPValue *Addr, VPValue *Mask)
-      : VPRecipeBase(VPWidenMemoryInstructionSC),
-        VPValue(VPValue::VPVMemoryInstructionSC, &Load), VPUser({Addr}) {
+      : VPRecipeBase(VPWidenMemoryInstructionSC), VPUser({Addr}),
+        Ingredient(Load) {
+    new VPValue(VPValue::VPVMemoryInstructionSC, &Load, this);
     setMask(Mask);
   }
 
   VPWidenMemoryInstructionRecipe(StoreInst &Store, VPValue *Addr,
                                  VPValue *StoredValue, VPValue *Mask)
-      : VPRecipeBase(VPWidenMemoryInstructionSC),
-        VPValue(VPValue::VPVMemoryInstructionSC, &Store),
-        VPUser({Addr, StoredValue}) {
+      : VPRecipeBase(VPWidenMemoryInstructionSC), VPUser({Addr, StoredValue}),
+        Ingredient(Store) {
     setMask(Mask);
   }
 
@@ -1311,7 +1312,7 @@ public:
   }
 
   /// Returns true if this recipe is a store.
-  bool isStore() const { return isa<StoreInst>(getUnderlyingInstr()); }
+  bool isStore() const { return isa<StoreInst>(Ingredient); }
 
   /// Return the address accessed by this recipe.
   VPValue *getStoredValue() const {

lib/Transforms/Vectorize/VPlanValue.h

@@ -36,6 +36,7 @@ class VPSlotTracker;
 class VPUser;
 class VPRecipeBase;
 class VPPredInstPHIRecipe;
+class VPWidenMemoryInstructionRecipe;
 
 // This is the base class of the VPlan Def/Use graph, used for modeling the data
 // flow into, within and out of the VPlan. VPValues can stand for live-ins
@@ -50,6 +51,7 @@ class VPValue {
   friend class VPSlotTracker;
   friend class VPRecipeBase;
   friend class VPPredInstPHIRecipe;
+  friend class VPWidenMemoryInstructionRecipe;
 
   const unsigned char SubclassID; ///< Subclass identifier (for isa/dyn_cast).