Support non-deoptimizing version of UnboxInt32 for integer definitions.

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/bit_vector.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
@@ skipping 1184 matching lines @@
   const intptr_t value_cid = value()->Type()->ToCid();
   if (value_cid == kSmiCid) {
     return (kSmiBits > 32) &&
         !is_truncating() &&
         !RangeUtils::Fits(value()->definition()->range(),
                           RangeBoundary::kRangeBoundaryInt32);
   } else if (value_cid == kMintCid) {
     return !is_truncating() &&
         !RangeUtils::Fits(value()->definition()->range(),
                           RangeBoundary::kRangeBoundaryInt32);
+  } else if ((kSmiBits < 32) && value()->Type()->IsInt()) {
+    // Note: we don't support truncation of Bigint values.
+    return !RangeUtils::Fits(value()->definition()->range(),
+                             RangeBoundary::kRangeBoundaryInt32);
   } else {
     return true;
   }
 }
 
 
 bool BinaryInt32OpInstr::CanDeoptimize() const {
   switch (op_kind()) {
     case Token::kBIT_AND:
     case Token::kBIT_OR:
@@ skipping 2219 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart