Clean up JSConstructStub

src/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 335 matching lines @@
       __ LoadRoot(rcx, Heap::kFixedArrayMapRootIndex);
       __ movp(Operand(rdi, HeapObject::kMapOffset), rcx);  // setup the map
       __ Integer32ToSmi(rdx, rdx);
       __ movp(Operand(rdi, FixedArray::kLengthOffset), rdx);  // and length
 
       // Initialize the fields to undefined.
       // rbx: JSObject
       // rdi: FixedArray
       // rax: start of next object
       // rdx: number of elements
-      { Label loop, entry;
-        __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
-        __ leap(rcx, Operand(rdi, FixedArray::kHeaderSize));
-        __ jmp(&entry);
-        __ bind(&loop);
-        __ movp(Operand(rcx, 0), rdx);
-        __ addp(rcx, Immediate(kPointerSize));
-        __ bind(&entry);
-        __ cmpp(rcx, rax);
-        __ j(below, &loop);
-      }
+      __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+      __ leap(rcx, Operand(rdi, FixedArray::kHeaderSize));
+      __ InitializeFieldsWithFiller(rcx, rax, rdx);
 
       // Store the initialized FixedArray into the properties field of
       // the JSObject
       // rbx: JSObject
       // rdi: FixedArray
       __ orp(rdi, Immediate(kHeapObjectTag));  // add the heap tag
       __ movp(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi);
 
 
       // Continue with JSObject being successfully allocated
@@ skipping 1407 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64