Introduce intrinsics for double values in Javascript.

src/arm/lithium-arm.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 62 matching lines @@
   V(CompareNumericAndBranch)                    \
   V(CmpObjectEqAndBranch)                       \
   V(CmpHoleAndBranch)                           \
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(ConstantD)                                  \
   V(ConstantE)                                  \
   V(ConstantI)                                  \
   V(ConstantS)                                  \
   V(ConstantT)                                  \
+  V(ConstructDouble)                            \
   V(Context)                                    \
   V(DateField)                                  \
   V(DebugBreak)                                 \
   V(DeclareGlobals)                             \
   V(Deoptimize)                                 \
   V(DivI)                                       \
+  V(DoubleBits)                                 \
   V(DoubleToI)                                  \
   V(DoubleToSmi)                                \
   V(Drop)                                       \
   V(Dummy)                                      \
   V(DummyUse)                                   \
   V(ForInCacheArray)                            \
   V(ForInPrepareMap)                            \
   V(FunctionLiteral)                            \
   V(GetCachedArrayIndex)                        \
   V(Goto)                                       \
@@ skipping 2280 matching lines @@
     temps_[0] = temp;
   }
 
   LOperand* unclamped() { return inputs_[0]; }
   LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(ClampTToUint8, "clamp-t-to-uint8")
 };
 
 
+class LDoubleBits V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LDoubleBits(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(DoubleBits, "double-bits")
+  DECLARE_HYDROGEN_ACCESSOR(DoubleBits)
+};
+
+
+class LConstructDouble V8_FINAL : public LTemplateInstruction<1, 2, 0> {
+ public:
+  LConstructDouble(LOperand* hi, LOperand* lo) {
+    inputs_[0] = hi;
+    inputs_[1] = lo;
+  }
+
+  LOperand* hi() { return inputs_[0]; }
+  LOperand* lo() { return inputs_[1]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(ConstructDouble, "construct-double")
+};
+
+
 class LAllocate V8_FINAL : public LTemplateInstruction<1, 2, 2> {
  public:
   LAllocate(LOperand* context,
             LOperand* size,
             LOperand* temp1,
             LOperand* temp2) {
     inputs_[0] = context;
     inputs_[1] = size;
     temps_[0] = temp1;
     temps_[1] = temp2;
@@ skipping 344 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_LITHIUM_ARM_H_