Better inlining of type tests.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 488 matching lines @@
     intptr_t token_pos,
     const AbstractType& type,
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("InlineInstanceof");
   if (type.IsVoidType()) {
     // A non-null value is returned from a void function, which will result in a
     // type error. A null value is handled prior to executing this inline code.
     return SubtypeTestCache::null();
   }
-  if (TypeCheckAsClassEquality(type)) {
-    const intptr_t type_cid = Class::Handle(type.type_class()).id();
-    const Register kInstanceReg = RAX;
-    __ testq(kInstanceReg, Immediate(kSmiTagMask));
-    if (type_cid == kSmiCid) {
-      __ j(ZERO, is_instance_lbl);
-    } else {
-      __ j(ZERO, is_not_instance_lbl);
-      __ CompareClassId(kInstanceReg, type_cid);
-      __ j(EQUAL, is_instance_lbl);
-    }
-    __ jmp(is_not_instance_lbl);
-    return SubtypeTestCache::null();
-  }
   if (type.IsInstantiated()) {
     const Class& type_class = Class::ZoneHandle(type.type_class());
     // A class equality check is only applicable with a dst type of a
     // non-parameterized class, non-signature class, or with a raw dst type of
     // a parameterized class.
     if (type_class.IsSignatureClass() || (type_class.NumTypeArguments() > 0)) {
       return GenerateInstantiatedTypeWithArgumentsTest(token_pos,
                                                        type,
                                                        is_instance_lbl,
                                                        is_not_instance_lbl);
@@ skipping 1319 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64