Version 3.8.6

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 10404)
+++ src/hydrogen-instructions.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -146,6 +146,7 @@
   V(Parameter)                                 \
   V(Power)                                     \
   V(PushArgument)                              \
+  V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
   V(Sar)                                       \
@@ -1130,12 +1131,16 @@
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
   virtual HType CalculateInferredType();
+  virtual HValue* Canonicalize();
 
   Representation from() { return value()->representation(); }
   Representation to() { return representation(); }
   bool deoptimize_on_undefined() const {
     return CheckFlag(kDeoptimizeOnUndefined);
   }
+  bool deoptimize_on_minus_zero() const {
+    return CheckFlag(kBailoutOnMinusZero);
+  }
   virtual Representation RequiredInputRepresentation(int index) {
     return from();
   }
@@ -1921,8 +1926,11 @@
 
 class HCheckMap: public HTemplateInstruction<2> {
  public:
-  HCheckMap(HValue* value, Handle<Map> map, HValue* typecheck = NULL)
-      : map_(map) {
+  HCheckMap(HValue* value, Handle<Map> map,
+            HValue* typecheck = NULL,
+            CompareMapMode mode = REQUIRE_EXACT_MAP)
+      : map_(map),
+        mode_(mode) {
     SetOperandAt(0, value);
     // If callers don't depend on a typecheck, they can pass in NULL. In that
     // case we use a copy of the |value| argument as a dummy value.
@@ -1930,6 +1938,9 @@
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
     SetFlag(kDependsOnMaps);
+    has_element_transitions_ =
+        map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL) != NULL ||
+        map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL) != NULL;
   }
 
   virtual Representation RequiredInputRepresentation(int index) {
@@ -1940,17 +1951,24 @@
 
   HValue* value() { return OperandAt(0); }
   Handle<Map> map() const { return map_; }
+  CompareMapMode mode() const { return mode_; }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckMap)
 
  protected:
   virtual bool DataEquals(HValue* other) {
     HCheckMap* b = HCheckMap::cast(other);
-    return map_.is_identical_to(b->map());
+    // Two CheckMaps instructions are DataEqual if their maps are identical and
+    // they have the same mode. The mode comparison can be ignored if the map
+    // has no elements transitions.
+    return map_.is_identical_to(b->map()) &&
+        (b->mode() == mode() || !has_element_transitions_);
   }
 
  private:
+  bool has_element_transitions_;
   Handle<Map> map_;
+  CompareMapMode mode_;
 };
 
 
@@ -2985,6 +3003,23 @@
 };
 
 
+class HRandom: public HTemplateInstruction<1> {
+ public:
+  explicit HRandom(HValue* global_object) {
+    SetOperandAt(0, global_object);
+    set_representation(Representation::Double());
+  }
+
+  HValue* global_object() { return OperandAt(0); }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random)
+};
+
+
 class HAdd: public HArithmeticBinaryOperation {
  public:
   HAdd(HValue* context, HValue* left, HValue* right)
@@ -3138,6 +3173,8 @@
 
   virtual bool IsCommutative() const { return true; }
 
+  virtual HValue* Canonicalize();
+
   static HInstruction* NewHBitwise(Zone* zone,
                                    Token::Value op,
                                    HValue* context,