Implement Math.random() purely in JavaScript.

src/hydrogen-instructions.h

 // 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 137 matching lines @@
   V(MapEnumLength)                             \
   V(MathFloorOfDiv)                            \
   V(MathMinMax)                                \
   V(Mod)                                       \
   V(Mul)                                       \
   V(OsrEntry)                                  \
   V(OuterContext)                              \
   V(Parameter)                                 \
   V(Power)                                     \
   V(PushArgument)                              \
-  V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
   V(Ror)                                       \
   V(Sar)                                       \
   V(SeqStringGetChar)                          \
   V(SeqStringSetChar)                          \
   V(Shl)                                       \
   V(Shr)                                       \
   V(Simulate)                                  \
   V(StackCheck)                                \
@@ skipping 4419 matching lines @@
     SetFlag(kUseGVN);
     SetGVNFlag(kChangesNewSpacePromotion);
   }
 
   virtual bool IsDeletable() const V8_OVERRIDE {
     return !right()->representation().IsTagged();
   }
 };
 
 
-class HRandom V8_FINAL : public HTemplateInstruction<1> {
- public:
-  DECLARE_INSTRUCTION_FACTORY_P1(HRandom, HValue*);
-
-  HValue* global_object() { return OperandAt(0); }
-
-  virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
-    return Representation::Tagged();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(Random)
-
- private:
-  explicit HRandom(HValue* global_object) {
-    SetOperandAt(0, global_object);
-    set_representation(Representation::Double());
-  }
-
-  virtual bool IsDeletable() const V8_OVERRIDE { return true; }
-};
-
-
 class HAdd V8_FINAL : public HArithmeticBinaryOperation {
  public:
   static HInstruction* New(Zone* zone,
                            HValue* context,
                            HValue* left,
                            HValue* right);
 
   // Add is only commutative if two integer values are added and not if two
   // tagged values are added (because it might be a String concatenation).
   virtual bool IsCommutative() const V8_OVERRIDE {
@@ skipping 2688 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_