Introduce faster swapping primitives.

src/x64/codegen-x64.cc

 // Copyright 2010 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 4344 matching lines @@
 
   // Load the argument on the stack and jump to the runtime.
   Load(args->at(0));
 
   NumberToStringStub stub;
   Result result = frame_->CallStub(&stub, 1);
   frame_->Push(&result);
 }
 
 
+void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
+  Comment cmnt(masm_, "[ GenerateSwapElements");
+
+  ASSERT_EQ(3, args->length());
+
+  Load(args->at(0));
+  Load(args->at(1));
+  Load(args->at(2));
+
+  Result result = frame_->CallRuntime(Runtime::kSwapElements, 3);
+  frame_->Push(&result);
+}
+
+
 void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) {
   Comment cmnt(masm_, "[ GenerateCallFunction");
 
   ASSERT(args->length() >= 2);
 
   int n_args = args->length() - 2;  // for receiver and function.
   Load(args->at(0));  // receiver
   for (int i = 0; i < n_args; i++) {
     Load(args->at(i + 1));
   }
@@ skipping 6110 matching lines @@
   // Call the function from C++.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal