MIPS: Introduce intrinsics for double values in Javascript.

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // 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 5165 matching lines @@
   __ ClampDoubleToUint8(result_reg, double_scratch0(), temp_reg);
   __ jmp(&done);
 
   __ bind(&is_smi);
   __ ClampUint8(result_reg, scratch);
 
   __ bind(&done);
 }
 
 
+void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
+  DoubleRegister value_reg = ToDoubleRegister(instr->value());
+  Register result_reg = ToRegister(instr->result());
+  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
+    __ FmoveHigh(result_reg, value_reg);
+  } else {
+    __ FmoveLow(result_reg, value_reg);
+  }
+}
+
+
+void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
+  Register hi_reg = ToRegister(instr->hi());
+  Register lo_reg = ToRegister(instr->lo());
+  DoubleRegister result_reg = ToDoubleRegister(instr->result());
+  __ Move(result_reg, lo_reg, hi_reg);
+}
+
+
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate V8_FINAL : public LDeferredCode {
    public:
     DeferredAllocate(LCodeGen* codegen, LAllocate* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     virtual void Generate() V8_OVERRIDE {
       codegen()->DoDeferredAllocate(instr_);
     }
     virtual LInstruction* instr() V8_OVERRIDE { return instr_; }
    private:
@@ skipping 556 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal