Optimize double min/max by reducing the code size (reusing left register as result removes the need…

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 2528 matching lines @@
   } else if ((recognized_kind == MethodRecognizer::kMathMin) ||
              (recognized_kind == MethodRecognizer::kMathMax)) {
     // We can handle only monomorphic min/max call sites with both arguments
     // being either doubles or Smi-s
     if (call->HasICData() && (call->ic_data()->NumberOfChecks() == 1)) {
       const ICData& ic_data = *call->ic_data();
       intptr_t result_cid = kIllegalCid;
       if (ICDataHasReceiverArgumentClassIds(ic_data, kDoubleCid, kDoubleCid)) {
         result_cid = kDoubleCid;
       } else if (ICDataHasReceiverArgumentClassIds(ic_data, kSmiCid, kSmiCid)) {
-        // TODO(srdjan): Implement for Smi.
-        result_cid = kIllegalCid;
+        result_cid = kSmiCid;
       }
       if (result_cid != kIllegalCid) {
         MathMinMaxInstr* min_max = new MathMinMaxInstr(
             recognized_kind,
             new Value(call->ArgumentAt(0)),
             new Value(call->ArgumentAt(1)),
             call->deopt_id(),
             result_cid);
         const ICData& unary_checks =
             ICData::ZoneHandle(ic_data.AsUnaryClassChecks());
@@ skipping 4681 matching lines @@
 
   // Insert materializations at environment uses.
   const Class& cls = Class::Handle(alloc->constructor().Owner());
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, cls, *fields);
   }
 }
 
 
 }  // namespace dart