Enables unboxed mints in ia32 javascript int compatability mode.

runtime/vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
@@ skipping 1058 matching lines @@
 
 bool EqualityCompareInstr::IsCheckedStrictEqual() const {
   if (!HasICData()) return false;
   return ic_data()->AllTargetsHaveSameOwner(kInstanceCid) &&
          (unary_ic_data_->NumberOfChecks() <=
              FLAG_max_equality_polymorphic_checks);
 }
 
 
 bool BinarySmiOpInstr::CanDeoptimize() const {
+#if defined(TARGET_ARCH_X64)
   if (FLAG_throw_on_javascript_int_overflow) return true;

[srdjan, 2013/08/02 18:07:22]

Instead of the architecture specific ifdef you could check the size of the Smi
instead.

[zra, 2013/08/02 18:30:27]

Done.

+#endif
   switch (op_kind()) {
     case Token::kBIT_AND:
     case Token::kBIT_OR:
     case Token::kBIT_XOR:
       return false;
     case Token::kSHR: {
       // Can't deopt if shift-count is known positive.
       Range* right_range = this->right()->definition()->range();
       return (right_range == NULL)
           || !right_range->IsWithin(0, RangeBoundary::kPlusInfinity);
@@ skipping 1514 matching lines @@
     default:
       UNREACHABLE();
   }
   return kPowRuntimeEntry;
 }
 
 
 #undef __
 
 }  // namespace dart