MIPS: Correctify instanceof and make it optimizable.

src/mips/macro-assembler-mips.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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 4252 matching lines @@
   bind(&loop);
   JumpIfSmi(result, &done);
   GetObjectType(result, temp, temp2);
   Branch(&done, ne, temp2, Operand(MAP_TYPE));
   lw(result, FieldMemOperand(result, Map::kConstructorOrBackPointerOffset));
   Branch(&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.  Load map into result reg.
-    GetObjectType(function, result, scratch);
-    Branch(miss, ne, scratch, Operand(JS_FUNCTION_TYPE));
-
-    lw(scratch,
-       FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    lw(scratch,
-       FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
-    And(scratch, scratch,
-        Operand(Smi::FromInt(1 << SharedFunctionInfo::kBoundFunction)));
-    Branch(miss, ne, scratch, Operand(zero_reg));
-
-    // Make sure that the function has an instance prototype.
-    lbu(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
-    And(scratch, scratch, Operand(1 << Map::kHasNonInstancePrototype));
-    Branch(&non_instance, ne, scratch, Operand(zero_reg));
-  }
-
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Register scratch, Label* miss) {
   // Get the prototype or initial map from the function.
   lw(result,
      FieldMemOperand(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.
   LoadRoot(t8, Heap::kTheHoleValueRootIndex);
   Branch(miss, eq, result, Operand(t8));
 
   // If the function does not have an initial map, we're done.
   Label done;
   GetObjectType(result, scratch, scratch);
   Branch(&done, ne, scratch, Operand(MAP_TYPE));
 
   // Get the prototype from the initial map.
   lw(result, FieldMemOperand(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, scratch);
-  }
-
   // All done.
   bind(&done);
 }
 
 
 void MacroAssembler::GetObjectType(Register object,
                                    Register map,
                                    Register type_reg) {
   lw(map, FieldMemOperand(object, HeapObject::kMapOffset));
   lbu(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
@@ skipping 1778 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS