Fix the receiver check in the HandleFastApiCall builtin.

src/ppc/builtins-ppc.cc

 // Copyright 2014 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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1291 matching lines @@
   Register scratch = r10;
 
   // If there is no signature, return the holder.
   __ LoadP(signature, FieldMemOperand(function_template_info,
                                       FunctionTemplateInfo::kSignatureOffset));
   Label receiver_check_passed;
   __ JumpIfRoot(signature, Heap::kUndefinedValueRootIndex,
                 &receiver_check_passed);
 
   // Walk the prototype chain.
+  __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   Label prototype_loop_start;
   __ bind(&prototype_loop_start);
 
-  // End if the receiver is null or if it's a hidden type.
-  __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
-  __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  __ LoadP(scratch, FieldMemOperand(map, Map::kBitField3Offset));
-  __ DecodeField<Map::IsHiddenPrototype>(scratch, SetRC);
-  __ bne(receiver_check_failed, cr0);
-
-
   // Get the constructor, if any.
   __ GetMapConstructor(constructor, map, scratch, scratch);
   __ cmpi(scratch, Operand(JS_FUNCTION_TYPE));
   Label next_prototype;
   __ bne(&next_prototype);
   Register type = constructor;
   __ LoadP(type,
            FieldMemOperand(constructor, JSFunction::kSharedFunctionInfoOffset));
   __ LoadP(type,
            FieldMemOperand(type, SharedFunctionInfo::kFunctionDataOffset));
@@ skipping 10 matching lines @@
   // in the chain.
   __ JumpIfSmi(type, &next_prototype);
   __ CompareObjectType(type, scratch, scratch, FUNCTION_TEMPLATE_INFO_TYPE);
   __ bne(&next_prototype);
 
   // Otherwise load the parent function template and iterate.
   __ LoadP(type,
            FieldMemOperand(type, FunctionTemplateInfo::kParentTemplateOffset));
   __ b(&function_template_loop);
 
-  // Load the next prototype and iterate.
+  // Load the next prototype.
   __ bind(&next_prototype);
   __ LoadP(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
+  // End if the prototype is null or not hidden.
+  __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
+  __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ LoadP(scratch, FieldMemOperand(map, Map::kBitField3Offset));
+  __ DecodeField<Map::IsHiddenPrototype>(scratch, SetRC);
+  __ beq(receiver_check_failed, cr0);
+  // Iterate.
   __ b(&prototype_loop_start);
 
   __ bind(&receiver_check_passed);
 }
 
 
 void Builtins::Generate_HandleFastApiCall(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r3                 : number of arguments excluding receiver
   //  -- r4                 : callee
@@ skipping 1132 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC