Optimize double.floor and double.ceil down to roundsd when SSE4.1 is available.

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/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 1321 matching lines @@
                                              call);
       } else {
         // Optimistically assume result fits into Smi.
         d2i_instr = new DoubleToSmiInstr(call->ArgumentAt(0)->value(), call);
       }
       call->ReplaceWith(d2i_instr, current_iterator());
       RemovePushArguments(call);
       return true;
     }
     if ((recognized_kind == MethodRecognizer::kDoubleTruncate) ||
-        (recognized_kind == MethodRecognizer::kDoubleRound)) {
+        (recognized_kind == MethodRecognizer::kDoubleRound) ||
+        (recognized_kind == MethodRecognizer::kDoubleFloor) ||
+        (recognized_kind == MethodRecognizer::kDoubleCeil)) {
       if (!CPUFeatures::double_truncate_round_supported()) {
         return false;
       }
       AddCheckClass(call, call->ArgumentAt(0)->value()->Copy());
       DoubleToDoubleInstr* d2d_instr =
           new DoubleToDoubleInstr(call->ArgumentAt(0)->value(),
                                   call,
                                   recognized_kind);
       call->ReplaceWith(d2d_instr, current_iterator());
       RemovePushArguments(call);
@@ skipping 3205 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart