VM: Add constant propagation for binary double operations.

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 8397 matching lines @@
 }
 
 
 void ConstantPropagator::VisitBinaryDoubleOp(
     BinaryDoubleOpInstr* instr) {
   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)) {
-    // TODO(kmillikin): Handle binary operation.
-    SetValue(instr, non_constant_);
+    ASSERT(left.IsSmi() || left.IsDouble());
+    ASSERT(right.IsSmi() || right.IsDouble());
+    double left_val = left.IsSmi()
+        ? Smi::Cast(left).AsDoubleValue() : Double::Cast(left).value();
+    double right_val = right.IsSmi()
+        ? Smi::Cast(right).AsDoubleValue() : Double::Cast(right).value();
+    double result_val = 0.0;
+    switch (instr->op_kind()) {
+      case Token::kADD:
+        result_val = left_val + right_val;
+        break;
+      case Token::kSUB:
+        result_val = left_val - right_val;
+        break;
+      case Token::kMUL:
+        result_val = left_val * right_val;
+        break;
+      case Token::kDIV:
+        result_val = left_val / right_val;
+        break;
+      default:
+        UNREACHABLE();
+    }
+    const Double& result = Double::ZoneHandle(Double::NewCanonical(result_val));
+    SetValue(instr, result);
   }
 }
 
 
 void ConstantPropagator::VisitBinaryFloat32x4Op(
     BinaryFloat32x4OpInstr* instr) {
   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_);
@@ skipping 1537 matching lines @@
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits_collector_.exits().length(); i++) {
     CreateMaterializationAt(
         exits_collector_.exits()[i], alloc, alloc->cls(), *slots);
   }
 }
 
 
 }  // namespace dart