Add Uint32 representation

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 435 matching lines @@
           // Propagate types after store-load-forwarding. Some phis may have
           // become smi phis that can be processed by range analysis.
           FlowGraphTypePropagator::Propagate(flow_graph);
           DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
           // We have to perform range analysis after LICM because it
           // optimistically moves CheckSmi through phis into loop preheaders
           // making some phis smi.
           optimizer.InferIntRanges();
           DEBUG_ASSERT(flow_graph->VerifyUseLists());
+
+          // TODO(johnmccutchan): Do integer instruction selection after

[Florian Schneider, 2014/07/11 15:33:58]

Fine with me. But is there a problem that I don't see with that? 
Because this TODO really only involves moving this one line of code into
RangeAnalysis::Analyze, after InferRanges, before RemoveConstraints.

[Cutch, 2014/07/11 22:04:13]

No, it was me not understanding entirely what you were proposing. This is done
now.

+          // range analysis but before range constraints are removed.
+          // Select integer instructions based on range analysis result.
+          optimizer.SelectIntegerInstructions();
+          DEBUG_ASSERT(flow_graph->VerifyUseLists());
         }
 
         if (FLAG_constant_propagation) {
           // Constant propagation can use information from range analysis to
           // find unreachable branch targets and eliminate branches that have
           // the same true- and false-target.
           ConstantPropagator::OptimizeBranches(flow_graph);
           DEBUG_ASSERT(flow_graph->VerifyUseLists());
         }
 
@@ skipping 503 matching lines @@
     const Object& result =
       Object::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart