X64: Implementation of a bunch of stubs, and some new opcodes.

src/x64/macro-assembler-x64.cc

 // Copyright 2009 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 41 matching lines @@
 
 void MacroAssembler::Check(Condition cc, const char* msg) {
   Label L;
   j(cc, &L);
   Abort(msg);
   // will not return here
   bind(&L);
 }
 
 
+void MacroAssembler::NegativeZeroTest(Register result,
+                                      Register op,
+                                      Label* then_label) {
+  Label ok;
+  testq(result, result);
+  j(not_zero, &ok);
+  testq(op, op);
+  j(sign, then_label);
+  bind(&ok);
+}
+
+
 void MacroAssembler::ConstructAndTestJSFunction() {
   const int initial_buffer_size = 4 * KB;
   char* buffer = new char[initial_buffer_size];
   MacroAssembler masm(buffer, initial_buffer_size);
 
   const uint64_t secret = V8_INT64_C(0xdeadbeefcafebabe);
   Handle<String> constant =
       Factory::NewStringFromAscii(Vector<const char>("451", 3), TENURED);
 #define __ ACCESS_MASM((&masm))
   // Construct a simple JSfunction here, using Assembler and MacroAssembler
@@ skipping 592 matching lines @@
   push(rcx);
 
   // Clear the top frame.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   movq(kScratchRegister, c_entry_fp_address);
   movq(Operand(kScratchRegister, 0), Immediate(0));
 }
 
 
 } }  // namespace v8::internal