Array index computation dehoisting.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 9083c1f8db9f9929bb80388f152d1576d9dc78ff..c250a06d48e3dae592738b03d61243dc7f6afd38 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1189,7 +1189,10 @@ class LLoadExternalArrayPointer: public LTemplateInstruction<1, 1, 0> {
 
 class LLoadKeyedFastElement: public LTemplateInstruction<1, 2, 0> {
  public:
-  LLoadKeyedFastElement(LOperand* elements, LOperand* key) {
+  LLoadKeyedFastElement(LOperand* elements,
+                        LOperand* key,
+                        uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = elements;
     inputs_[1] = key;
   }
@@ -1199,12 +1202,22 @@ class LLoadKeyedFastElement: public LTemplateInstruction<1, 2, 0> {
 
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };
 
 
 class LLoadKeyedFastDoubleElement: public LTemplateInstruction<1, 2, 0> {
  public:
-  LLoadKeyedFastDoubleElement(LOperand* elements, LOperand* key) {
+  LLoadKeyedFastDoubleElement(LOperand* elements,
+                              LOperand* key,
+                              uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = elements;
     inputs_[1] = key;
   }
@@ -1215,13 +1228,22 @@ class LLoadKeyedFastDoubleElement: public LTemplateInstruction<1, 2, 0> {
 
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };
 
 
 class LLoadKeyedSpecializedArrayElement: public LTemplateInstruction<1, 2, 0> {
  public:
   LLoadKeyedSpecializedArrayElement(LOperand* external_pointer,
-                                    LOperand* key) {
+                                    LOperand* key,
+                                    uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = external_pointer;
     inputs_[1] = key;
   }
@@ -1235,6 +1257,13 @@ class LLoadKeyedSpecializedArrayElement: public LTemplateInstruction<1, 2, 0> {
   ElementsKind elements_kind() const {
     return hydrogen()->elements_kind();
   }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };
 
 
@@ -1677,7 +1706,11 @@ class LStoreNamedGeneric: public LTemplateInstruction<0, 2, 0> {
 
 class LStoreKeyedFastElement: public LTemplateInstruction<0, 3, 0> {
  public:
-  LStoreKeyedFastElement(LOperand* obj, LOperand* key, LOperand* val) {
+  LStoreKeyedFastElement(LOperand* obj,
+                         LOperand* key,
+                         LOperand* val,
+                         uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = obj;
     inputs_[1] = key;
     inputs_[2] = val;
@@ -1692,6 +1725,13 @@ class LStoreKeyedFastElement: public LTemplateInstruction<0, 3, 0> {
   LOperand* object() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   LOperand* value() { return inputs_[2]; }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };
 
 
@@ -1699,7 +1739,9 @@ class LStoreKeyedFastDoubleElement: public LTemplateInstruction<0, 3, 0> {
  public:
   LStoreKeyedFastDoubleElement(LOperand* elements,
                                LOperand* key,
-                               LOperand* val) {
+                               LOperand* val,
+                               uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = elements;
     inputs_[1] = key;
     inputs_[2] = val;
@@ -1716,6 +1758,13 @@ class LStoreKeyedFastDoubleElement: public LTemplateInstruction<0, 3, 0> {
   LOperand* value() { return inputs_[2]; }
 
   bool NeedsCanonicalization() { return hydrogen()->NeedsCanonicalization(); }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };
 
 
@@ -1723,7 +1772,9 @@ class LStoreKeyedSpecializedArrayElement: public LTemplateInstruction<0, 3, 0> {
  public:
   LStoreKeyedSpecializedArrayElement(LOperand* external_pointer,
                                      LOperand* key,
-                                     LOperand* val) {
+                                     LOperand* val,
+                                     uint32_t additional_index = 0)
+      : additional_index_(additional_index) {
     inputs_[0] = external_pointer;
     inputs_[1] = key;
     inputs_[2] = val;
@@ -1739,6 +1790,13 @@ class LStoreKeyedSpecializedArrayElement: public LTemplateInstruction<0, 3, 0> {
   ElementsKind elements_kind() const {
     return hydrogen()->elements_kind();
   }
+  uint32_t additional_index() const { return additional_index_; }
+  void set_additional_index(uint32_t additional_index) {
+    additional_index_ = additional_index;
+  }
+
+ private:
+  uint32_t additional_index_;
 };