Collect type feedback for power-of-2 right operands in BinaryOps.

src/type-info.cc

 // Copyright 2012 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 438 matching lines @@
     case BinaryOpIC::GENERIC:        return TypeInfo::Unknown();
   }
   UNREACHABLE();
   return TypeInfo::Unknown();
 }
 
 
 void TypeFeedbackOracle::BinaryType(BinaryOperation* expr,
                                     TypeInfo* left,
                                     TypeInfo* right,
-                                    TypeInfo* result) {
+                                    TypeInfo* result,
+                                    bool* has_fixed_right_arg,
+                                    int* fixed_right_arg_value) {
   Handle<Object> object = GetInfo(expr->BinaryOperationFeedbackId());
   TypeInfo unknown = TypeInfo::Unknown();
   if (!object->IsCode()) {
     *left = *right = *result = unknown;
     return;
   }
   Handle<Code> code = Handle<Code>::cast(object);
   if (code->is_binary_op_stub()) {
+    int minor_key = code->stub_info();
     BinaryOpIC::TypeInfo left_type, right_type, result_type;
-    BinaryOpStub::decode_types_from_minor_key(code->stub_info(), &left_type,
-                                              &right_type, &result_type);
+    BinaryOpStub::decode_types_from_minor_key(
+        minor_key, &left_type, &right_type, &result_type);
     *left = TypeFromBinaryOpType(left_type);
     *right = TypeFromBinaryOpType(right_type);
     *result = TypeFromBinaryOpType(result_type);
+    *has_fixed_right_arg =
+        BinaryOpStub::decode_has_fixed_right_arg_from_minor_key(minor_key);
+    *fixed_right_arg_value =
+        BinaryOpStub::decode_fixed_right_arg_value_from_minor_key(minor_key);
     return;
   }
   // Not a binary op stub.
   *left = *right = *result = unknown;
 }
 
 
 TypeInfo TypeFeedbackOracle::SwitchType(CaseClause* clause) {
   Handle<Object> object = GetInfo(clause->CompareId());
   TypeInfo unknown = TypeInfo::Unknown();
@@ skipping 274 matching lines @@
   USE(maybe_result);
 #ifdef DEBUG
   Object* result = NULL;
   // Dictionary has been allocated with sufficient size for all elements.
   ASSERT(maybe_result->ToObject(&result));
   ASSERT(*dictionary_ == result);
 #endif
 }
 
 } }  // namespace v8::internal