Optimized megamorphic stubs

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 1329 matching lines @@
 
     __ CompareClassId(RDI, kOneByteStringCid);
     __ j(NOT_EQUAL, &megamorphic_call, Assembler::kNearJump);
     __ movq(RAX, FieldAddress(RDI, String::hash_offset()));
     __ cmpq(RAX, Immediate(0));
     __ j(NOT_EQUAL, &done, Assembler::kNearJump);
 
     __ Bind(&megamorphic_call);
     __ Comment("Slow case: megamorphic call");
   }
+

[Florian Schneider, 2016/07/07 17:13:36]

Accidental \n?

[bakster, 2016/07/07 18:00:03]

Done.

   __ LoadObject(RBX, cache);
   if (FLAG_use_megamorphic_stub) {
-    __ Call(*StubCode::MegamorphicLookup_entry());
+    __ call(Address(THR, Thread::megamorphic_lookup_entry_point_offset()));
   } else  {
     StubCode::EmitMegamorphicLookup(assembler());
   }
   __ call(RCX);
 
   __ Bind(&done);
   RecordSafepoint(locs, slow_path_argument_count);
   const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
   if (FLAG_precompiled_mode) {
     // Megamorphic calls may occur in slow path stubs.
@@ skipping 504 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64