Optimize StoreIndexedComp on ia32&x64.

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2012, 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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/debugger.h"
 #include "vm/il_printer.h"
@@ skipping 136 matching lines @@
                                        token_index,
                                        try_index);
 }
 
 
 Label* FlowGraphCompiler::AddDeoptStub(intptr_t deopt_id,
                                        intptr_t deopt_token_index,
                                        intptr_t try_index,
                                        DeoptReasonId reason,
                                        Register reg1,
-                                       Register reg2) {
+                                       Register reg2,
+                                       Register reg3) {
   DeoptimizationStub* stub =
       new DeoptimizationStub(deopt_id, deopt_token_index, try_index, reason);
   stub->Push(reg1);

[srdjan, 2012/06/12 16:43:46]

I think we need to guard reg2 as well for kNoRegister.

   stub->Push(reg2);
+  if (reg3 != kNoRegister) stub->Push(reg3);
   deopt_stubs_.Add(stub);
   return stub->entry_label();
 }
 
 
 void FlowGraphCompiler::FinalizeExceptionHandlers(const Code& code) {
   ASSERT(exception_handlers_list_ != NULL);
   const ExceptionHandlers& handlers = ExceptionHandlers::Handle(
       exception_handlers_list_->FinalizeExceptionHandlers(code.EntryPoint()));
   code.set_exception_handlers(handlers);
@@ skipping 186 matching lines @@
 
 
 void FlowGraphCompiler::EmitComment(Instruction* instr) {
   char buffer[80];
   BufferFormatter f(buffer, sizeof(buffer));
   instr->PrintTo(&f);
   assembler()->Comment("@%d: %s", instr->cid(), buffer);
 }
 
 }  // namespace dart