Merge ConstantInstr -> UnboxDouble to UnboxedConstant. Reduces register usage and allows for variou…

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/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 7576 matching lines @@
   const Object& left = instr->left()->definition()->constant_value();
   const Object& right = instr->right()->definition()->constant_value();
   if (IsNonConstant(left) || IsNonConstant(right)) {
     SetValue(instr, non_constant_);
   } else if (IsConstant(left) && IsConstant(right)) {
     if (left.IsInteger() && right.IsInteger()) {
       const bool result = CompareIntegers(instr->kind(),
                                           Integer::Cast(left),
                                           Integer::Cast(right));
       SetValue(instr, Bool::Get(result));
+    } else if (left.IsDouble() && right.IsDouble()) {
+      // TODO(srdjan): Implement.
+      SetValue(instr, non_constant_);
     } else {
       SetValue(instr, non_constant_);
     }
   }
 }
 
 
 void ConstantPropagator::VisitNativeCall(NativeCallInstr* instr) {
   SetValue(instr, non_constant_);
 }
@@ skipping 448 matching lines @@
 void ConstantPropagator::VisitExtractNthOutput(ExtractNthOutputInstr* instr) {
   SetValue(instr, non_constant_);
 }
 
 
 void ConstantPropagator::VisitConstant(ConstantInstr* instr) {
   SetValue(instr, instr->value());
 }
 
 
+void ConstantPropagator::VisitUnboxedConstant(UnboxedConstantInstr* instr) {
+  SetValue(instr, instr->value());
+}
+
+
 void ConstantPropagator::VisitConstraint(ConstraintInstr* instr) {
   // Should not be used outside of range analysis.
   UNREACHABLE();
 }
 
 
 void ConstantPropagator::VisitMaterializeObject(MaterializeObjectInstr* instr) {
   // Should not be used outside of allocation elimination pass.
   UNREACHABLE();
 }
@@ skipping 1119 matching lines @@
   }
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, alloc->cls(), *slots);
   }
 }
 
 
 }  // namespace dart