Fix for issue 2132.

src/hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1090 matching lines @@
     }
   }
 
   if (new_range != NULL && !new_range->IsMostGeneric()) {
     AddRange(value, new_range);
   }
 }
 
 
 void HRangeAnalysis::InferRange(HValue* value) {
-  ASSERT(!value->HasRange());
+  ASSERT(value->CheckFlag(HValue::kHasPreinitializedRange)
+         || !value->HasRange());

[Florian Schneider, 2012/05/18 16:12:06]

Can't you just check HasRange() here and leave it alone if there is an exisiting
range calculated?

   if (!value->representation().IsNone()) {
     value->ComputeInitialRange(zone_);
     Range* range = value->range();
     TraceRange("Initial inferred range of %d (%s) set to [%d,%d]\n",
                value->id(),
                value->Mnemonic(),
                range->lower(),
                range->upper());
   }
 }
@@ skipping 7738 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal