[stubs] Implement fast TF Builtin for Object.create

src/compiler/code-assembler.cc

 // Copyright 2015 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/compiler/code-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 202 matching lines @@
 Node* CodeAssembler::WordShr(Node* value, int shift) {
   return (shift != 0) ? raw_assembler_->WordShr(value, IntPtrConstant(shift))
                       : value;
 }
 
 Node* CodeAssembler::Word32Shr(Node* value, int shift) {
   return (shift != 0) ? raw_assembler_->Word32Shr(value, IntPtrConstant(shift))
                       : value;
 }
 
+Node* CodeAssembler::IsWordAligned(Node* value) {
+  /* return WordNotEqual(IntPtrConstant(0), */

[Igor Sheludko, 2016/10/18 14:22:18]

?

+  /*           WordAnd(value, IntPtrConstant((1 << kPointerSizeLog2)-1))); */
+  return WordEqual(value,
+                   WordShl(WordShr(value, kPointerSizeLog2), kPointerSizeLog2));
+}
+
 Node* CodeAssembler::ChangeUint32ToWord(Node* value) {
   if (raw_assembler_->machine()->Is64()) {
     value = raw_assembler_->ChangeUint32ToUint64(value);
   }
   return value;
 }
 
 Node* CodeAssembler::ChangeInt32ToIntPtr(Node* value) {
   if (raw_assembler_->machine()->Is64()) {
     value = raw_assembler_->ChangeInt32ToInt64(value);
@@ skipping 884 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8