Correctify instanceof and make it optimizable.

src/x64/macro-assembler-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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 3438 matching lines @@
   bind(&loop);
   JumpIfSmi(result, &done);
   CmpObjectType(result, MAP_TYPE, temp);
   j(not_equal, &done);
   movp(result, FieldOperand(result, Map::kConstructorOrBackPointerOffset));
   jmp(&loop);
   bind(&done);
 }
 
 
-void MacroAssembler::TryGetFunctionPrototype(Register function,
-                                             Register result,
-                                             Label* miss,
-                                             bool miss_on_bound_function) {
-  Label non_instance;
-  if (miss_on_bound_function) {
-    // Check that the receiver isn't a smi.
-    testl(function, Immediate(kSmiTagMask));
-    j(zero, miss);
-
-    // Check that the function really is a function.
-    CmpObjectType(function, JS_FUNCTION_TYPE, result);
-    j(not_equal, miss);
-
-    movp(kScratchRegister,
-         FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    // It's not smi-tagged (stored in the top half of a smi-tagged 8-byte
-    // field).
-    TestBitSharedFunctionInfoSpecialField(kScratchRegister,
-        SharedFunctionInfo::kCompilerHintsOffset,
-        SharedFunctionInfo::kBoundFunction);
-    j(not_zero, miss);
-
-    // Make sure that the function has an instance prototype.
-    testb(FieldOperand(result, Map::kBitFieldOffset),
-          Immediate(1 << Map::kHasNonInstancePrototype));
-    j(not_zero, &non_instance, Label::kNear);
-  }
-
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Label* miss) {
   // Get the prototype or initial map from the function.
   movp(result,
        FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
 
   // If the prototype or initial map is the hole, don't return it and
   // simply miss the cache instead. This will allow us to allocate a
   // prototype object on-demand in the runtime system.
   CompareRoot(result, Heap::kTheHoleValueRootIndex);
   j(equal, miss);
 
   // If the function does not have an initial map, we're done.
   Label done;
   CmpObjectType(result, MAP_TYPE, kScratchRegister);
   j(not_equal, &done, Label::kNear);
 
   // Get the prototype from the initial map.
   movp(result, FieldOperand(result, Map::kPrototypeOffset));
 
-  if (miss_on_bound_function) {
-    jmp(&done, Label::kNear);
-
-    // Non-instance prototype: Fetch prototype from constructor field
-    // in initial map.
-    bind(&non_instance);
-    GetMapConstructor(result, result, kScratchRegister);
-  }
-
   // All done.
   bind(&done);
 }
 
 
 void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     Operand counter_operand = ExternalOperand(ExternalReference(counter));
     movl(counter_operand, Immediate(value));
   }
@@ skipping 1559 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64