New hydrogen instruction to reduce cost of growing an array on keyed stores.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 109 matching lines @@
   V(LoadFunctionPrototype)                    \
   V(LoadGlobalGeneric)                        \
   V(LoadKeyed)                                \
   V(LoadKeyedGeneric)                         \
   V(LoadNamedField)                           \
   V(LoadNamedGeneric)                         \
   V(LoadRoot)                                 \
   V(MapEnumLength)                            \
   V(MathFloorOfDiv)                           \
   V(MathMinMax)                               \
+  V(MaybeGrowElements)                        \
   V(Mod)                                      \
   V(Mul)                                      \
   V(OsrEntry)                                 \
   V(Parameter)                                \
   V(Power)                                    \
   V(PushArguments)                            \
   V(RegExpLiteral)                            \
   V(Return)                                   \
   V(Ror)                                      \
   V(Sar)                                      \
@@ skipping 818 matching lines @@
                 P3 p3, P4 p4) {                                              \
     return new (zone) I(context, p1, p2, p3, p4);                            \
   }
 
 #define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P5(I, P1, P2, P3, P4, P5)   \
   static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
                 P3 p3, P4 p4, P5 p5) {                                       \
     return new (zone) I(context, p1, p2, p3, p4, p5);                        \
   }
 
+#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(I, P1, P2, P3, P4, P5, P6) \
+  static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2,   \
+                P3 p3, P4 p4, P5 p5, P6 p6) {                                  \
+    return new (zone) I(context, p1, p2, p3, p4, p5, p6);                      \
+  }
+
 
 // A helper class to represent per-operand position information attached to
 // the HInstruction in the compact form. Uses tagging to distinguish between
 // case when only instruction's position is available and case when operands'
 // positions are also available.
 // In the first case it contains intruction's position as a tagged value.
 // In the second case it points to an array which contains instruction's
 // position and operands' positions.
 class HPositionInfo {
  public:
@@ skipping 6573 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(TrapAllocationMemento)
 
  private:
   explicit HTrapAllocationMemento(HValue* obj) {
     SetOperandAt(0, obj);
   }
 };
 
 
+class HMaybeGrowElements final : public HTemplateInstruction<5> {
+ public:
+  DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(HMaybeGrowElements, HValue*,
+                                              HValue*, HValue*, HValue*, bool,
+                                              ElementsKind);
+
+  Representation RequiredInputRepresentation(int index) override {
+    if (index < 3) {
+      return Representation::Tagged();
+    }
+    DCHECK(index == 3 || index == 4);
+    return Representation::Integer32();
+  }
+
+  HValue* context() const { return OperandAt(0); }
+  HValue* object() const { return OperandAt(1); }
+  HValue* elements() const { return OperandAt(2); }
+  HValue* key() const { return OperandAt(3); }
+  HValue* current_capacity() const { return OperandAt(4); }
+
+  bool is_js_array() const { return is_js_array_; }
+  ElementsKind kind() const { return kind_; }
+
+  DECLARE_CONCRETE_INSTRUCTION(MaybeGrowElements)
+
+ protected:
+  bool DataEquals(HValue* other) override { return true; }
+
+ private:
+  explicit HMaybeGrowElements(HValue* context, HValue* object, HValue* elements,
+                              HValue* key, HValue* current_capacity,
+                              bool is_js_array, ElementsKind kind) {
+    is_js_array_ = is_js_array;
+    kind_ = kind;
+
+    SetOperandAt(0, context);
+    SetOperandAt(1, object);
+    SetOperandAt(2, elements);
+    SetOperandAt(3, key);
+    SetOperandAt(4, current_capacity);
+
+    SetFlag(kUseGVN);
+    SetChangesFlag(kElementsPointer);
+    SetChangesFlag(kNewSpacePromotion);
+    set_representation(Representation::Tagged());
+  }
+
+  bool is_js_array_;
+  ElementsKind kind_;
+};
+
+
 class HToFastProperties final : public HUnaryOperation {
  public:
   DECLARE_INSTRUCTION_FACTORY_P1(HToFastProperties, HValue*);
 
   Representation RequiredInputRepresentation(int index) override {
     return Representation::Tagged();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(ToFastProperties)
 
@@ skipping 315 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_