X87: Correctify instanceof and make it optimizable.

src/x87/macro-assembler-x87.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_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1743 matching lines @@
   bind(&loop);
   JumpIfSmi(result, &done);
   CmpObjectType(result, MAP_TYPE, temp);
   j(not_equal, &done);
   mov(result, FieldOperand(result, Map::kConstructorOrBackPointerOffset));
   jmp(&loop);
   bind(&done);
 }
 
 
-void MacroAssembler::TryGetFunctionPrototype(Register function,
-                                             Register result,
-                                             Register scratch,
-                                             Label* miss,
-                                             bool miss_on_bound_function) {
-  Label non_instance;
-  if (miss_on_bound_function) {
-    // Check that the receiver isn't a smi.
-    JumpIfSmi(function, miss);
-
-    // Check that the function really is a function.
-    CmpObjectType(function, JS_FUNCTION_TYPE, result);
-    j(not_equal, miss);
-
-    // If a bound function, go to miss label.
-    mov(scratch,
-        FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    BooleanBitTest(scratch, SharedFunctionInfo::kCompilerHintsOffset,
-                   SharedFunctionInfo::kBoundFunction);
-    j(not_zero, miss);
-
-    // Make sure that the function has an instance prototype.
-    movzx_b(scratch, FieldOperand(result, Map::kBitFieldOffset));
-    test(scratch, Immediate(1 << Map::kHasNonInstancePrototype));
-    j(not_zero, &non_instance);
-  }
-
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Register scratch, Label* miss) {
   // Get the prototype or initial map from the function.
   mov(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.
   cmp(result, Immediate(isolate()->factory()->the_hole_value()));
   j(equal, miss);
 
   // If the function does not have an initial map, we're done.
   Label done;
   CmpObjectType(result, MAP_TYPE, scratch);
-  j(not_equal, &done);
+  j(not_equal, &done, Label::kNear);
 
   // Get the prototype from the initial map.
   mov(result, FieldOperand(result, Map::kPrototypeOffset));
 
-  if (miss_on_bound_function) {
-    jmp(&done);
-
-    // Non-instance prototype: Fetch prototype from constructor field
-    // in initial map.
-    bind(&non_instance);
-    GetMapConstructor(result, result, scratch);
-  }
-
   // All done.
   bind(&done);
 }
 
 
 void MacroAssembler::CallStub(CodeStub* stub, TypeFeedbackId ast_id) {
   DCHECK(AllowThisStubCall(stub));  // Calls are not allowed in some stubs.
   call(stub->GetCode(), RelocInfo::CODE_TARGET, ast_id);
 }
 
@@ skipping 1269 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87