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

src/x64/lithium-x64.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_X64_LITHIUM_X64_H_
 #define V8_X64_LITHIUM_X64_H_
 
 #include "src/hydrogen.h"
 #include "src/lithium.h"
 #include "src/lithium-allocator.h"
@@ skipping 99 matching lines @@
   V(MathAbs)                                 \
   V(MathClz32)                               \
   V(MathExp)                                 \
   V(MathFloor)                               \
   V(MathFround)                              \
   V(MathLog)                                 \
   V(MathMinMax)                              \
   V(MathPowHalf)                             \
   V(MathRound)                               \
   V(MathSqrt)                                \
+  V(MaybeGrowElements)                       \
   V(ModByConstI)                             \
   V(ModByPowerOf2I)                          \
   V(ModI)                                    \
   V(MulI)                                    \
   V(NumberTagD)                              \
   V(NumberTagI)                              \
   V(NumberTagU)                              \
   V(NumberUntagD)                            \
   V(OsrEntry)                                \
   V(Parameter)                               \
@@ skipping 2157 matching lines @@
   }
 
   LOperand* object() { return inputs_[0]; }
   LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(TrapAllocationMemento,
                                "trap-allocation-memento")
 };
 
 
+class LMaybeGrowElements final : public LTemplateInstruction<1, 5, 0> {
+ public:
+  LMaybeGrowElements(LOperand* context, LOperand* object, LOperand* elements,
+                     LOperand* key, LOperand* current_capacity) {
+    inputs_[0] = context;
+    inputs_[1] = object;
+    inputs_[2] = elements;
+    inputs_[3] = key;
+    inputs_[4] = current_capacity;
+  }
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
+  LOperand* elements() { return inputs_[2]; }
+  LOperand* key() { return inputs_[3]; }
+  LOperand* current_capacity() { return inputs_[4]; }
+
+  DECLARE_HYDROGEN_ACCESSOR(MaybeGrowElements)
+  DECLARE_CONCRETE_INSTRUCTION(MaybeGrowElements, "maybe-grow-elements")
+};
+
+
 class LStringAdd final : public LTemplateInstruction<1, 3, 0> {
  public:
   LStringAdd(LOperand* context, LOperand* left, LOperand* right) {
     inputs_[0] = context;
     inputs_[1] = left;
     inputs_[2] = right;
   }
 
   LOperand* context() { return inputs_[0]; }
   LOperand* left() { return inputs_[1]; }
@@ skipping 548 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_