Optimize equality for case when all targets are Object.equals.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/flow_graph_builder.h"
 #include "vm/il_printer.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
@@ skipping 529 matching lines @@
   const ICData& ic_data = *comp->ic_data();
   if (ic_data.NumberOfChecks() == 0) return;
   // TODO(srdjan): Add multiple receiver type support.
   if (ic_data.NumberOfChecks() != 1) return;
   ASSERT(HasOneTarget(ic_data));
 
   if (HasOnlyTwoSmi(ic_data)) {
     comp->set_operands_class_id(kSmiCid);
   } else if (HasOnlyTwoDouble(ic_data)) {
     comp->set_operands_class_id(kDoubleCid);
+  } else if (comp->ic_data()->AllReceiversAreNumbers()) {
+    comp->set_operands_class_id(kNumberCid);
   }
 }
 
 
 void FlowGraphOptimizer::VisitEqualityCompare(EqualityCompareComp* comp,
                                               BindInstr* instr) {
-  if (comp->HasICData() && (comp->ic_data()->NumberOfChecks() == 1)) {
+  if (!comp->HasICData() || (comp->ic_data()->NumberOfChecks() == 0)) return;
+  if (comp->ic_data()->NumberOfChecks() == 1) {
     ASSERT(comp->ic_data()->num_args_tested() == 2);
     GrowableArray<intptr_t> class_ids;
     Function& target = Function::Handle();
     comp->ic_data()->GetCheckAt(0, &class_ids, &target);
     // TODO(srdjan): allow for mixed mode comparison.
     if ((class_ids[0] == kSmiCid) && (class_ids[1] == kSmiCid)) {
       comp->set_receiver_class_id(kSmiCid);
     } else if ((class_ids[0] == kDoubleCid) && (class_ids[1] == kDoubleCid)) {
       comp->set_receiver_class_id(kDoubleCid);
+    } else {
+      ASSERT(comp->receiver_class_id() == kIllegalCid);
     }
+  } else if (comp->ic_data()->AllReceiversAreNumbers()) {
+    comp->set_receiver_class_id(kNumberCid);
   }
 }
 
 
 void FlowGraphOptimizer::VisitBind(BindInstr* instr) {
   instr->computation()->Accept(this, instr);
 }
 
 
 void FlowGraphTypePropagator::VisitAssertAssignable(AssertAssignableComp* comp,
@@ skipping 134 matching lines @@
       LocationSummary* locs = it.Current()->locs();
       if ((locs != NULL) && locs->is_call()) {
         is_leaf_ = false;
         return;
       }
     }
   }
 }
 
 }  // namespace dart