Improve smi shift operations and avoid repeated deoptimizations.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 7408 matching lines @@
 void ICData::set_num_args_tested(intptr_t value) const {
   raw_ptr()->num_args_tested_ = value;
 }
 
 
 void ICData::set_ic_data(const Array& value) const {
   StorePointer(&raw_ptr()->ic_data_, value.raw());
 }
 
 
+void ICData::set_deopt_reason(intptr_t deopt_reason) const {
+  raw_ptr()->deopt_reason_ = deopt_reason;
+}
+
+
 intptr_t ICData::TestEntryLength() const {
   return num_args_tested() + 1 /* target function*/;
 }
 
 
 intptr_t ICData::NumberOfChecks() const {
   // Do not count the sentinel;
   return (Array::Handle(ic_data()).Length() / TestEntryLength()) - 1;
 }
 
@@ skipping 254 matching lines @@
     RawObject* raw = Object::Allocate(ICData::kClassId,
                                       ICData::InstanceSize(),
                                       Heap::kOld);
     NoGCScope no_gc;
     result ^= raw;
   }
   result.set_function(function);
   result.set_target_name(target_name);
   result.set_deopt_id(deopt_id);
   result.set_num_args_tested(num_args_tested);
+  result.set_deopt_reason(kDeoptUnknown);
   // Number of array elements in one test entry (num_args_tested + 1)
   intptr_t len = result.TestEntryLength();
   // IC data array must be null terminated (sentinel entry).
   const Array& ic_data = Array::Handle(Array::New(len, Heap::kOld));
   result.set_ic_data(ic_data);
   result.WriteSentinel();
   return result.raw();
 }
 
 
@@ skipping 4238 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart