A CL that only removes dead code from the VM compiler.

runtime/vm/flow_graph_compiler.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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 61 matching lines @@
   intptr_t slot_ix = 0;
   Environment* current = deoptimization_env_;
 
   // For the innermost environment, call the virtual return builder.
   BuildReturnAddress(builder, current->function(), slot_ix++);
 
   // For the innermost environment, set outgoing arguments and the locals.
   for (intptr_t i = current->Length() - 1;
        i >= current->fixed_parameter_count();
        i--) {
-    builder->AddCopy(current->LocationAt(i), *current->ValueAt(i), slot_ix++);
+    builder->AddCopy(current->LocationAt(i), slot_ix++);
   }
 
   // PC marker and caller FP.
   builder->AddPcMarker(current->function(), slot_ix++);
   builder->AddCallerFp(slot_ix++);
 
   Environment* previous = current;
   current = current->outer();
   while (current != NULL) {
     // For any outer environment the deopt id is that of the call instruction
     // which is recorded in the outer environment.
     builder->AddReturnAddressAfter(current->function(),
                                    current->deopt_id(),
                                    slot_ix++);
 
     // The values of outgoing arguments can be changed from the inlined call so
     // we must read them from the previous environment.
     for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) {
-      builder->AddCopy(previous->LocationAt(i), *previous->ValueAt(i),
-                       slot_ix++);
+      builder->AddCopy(previous->LocationAt(i), slot_ix++);
     }
 
     // Set the locals, note that outgoing arguments are not in the environment.
     for (intptr_t i = current->Length() - 1;
          i >= current->fixed_parameter_count();
          i--) {
-      builder->AddCopy(current->LocationAt(i), *current->ValueAt(i), slot_ix++);
+      builder->AddCopy(current->LocationAt(i), slot_ix++);
     }
 
     // PC marker and caller FP.
     builder->AddPcMarker(current->function(), slot_ix++);
     builder->AddCallerFp(slot_ix++);
 
     // Iterate on the outer environment.
     previous = current;
     current = current->outer();
   }
   // The previous pointer is now the outermost environment.
   ASSERT(previous != NULL);
 
   // For the outermost environment, set caller PC.
   builder->AddCallerPc(slot_ix++);
 
   // For the outermost environment, set the incoming arguments.
   for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) {
-    builder->AddCopy(previous->LocationAt(i), *previous->ValueAt(i), slot_ix++);
+    builder->AddCopy(previous->LocationAt(i), slot_ix++);
   }
 
   const DeoptInfo& deopt_info = DeoptInfo::Handle(builder->CreateDeoptInfo());
   return deopt_info.raw();
 }
 
 
 FlowGraphCompiler::FlowGraphCompiler(Assembler* assembler,
                                      const FlowGraph& flow_graph,
                                      bool is_optimizing)
@@ skipping 938 matching lines @@
     if (i != largest_ix) {
       // Swap.
       CidTarget temp = (*sorted)[i];
       (*sorted)[i] = (*sorted)[largest_ix];
       (*sorted)[largest_ix] = temp;
     }
   }
 }
 
 }  // namespace dart