Collect type feedback for power-of-2 right operands in BinaryOps.

src/objects.cc

 // Copyright 2013 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 137 matching lines @@
                                              Name* name,
                                              PropertyAttributes* attributes) {
   LookupResult result(name->GetIsolate());
   Lookup(name, &result);
   MaybeObject* value = GetProperty(receiver, &result, name, attributes);
   ASSERT(*attributes <= ABSENT);
   return value;
 }
 
 
+bool Object::ToInt32(int32_t* value) {
+  if (IsSmi()) {
+    *value = Smi::cast(this)->value();
+    return true;
+  }
+  if (IsHeapNumber()) {
+    double num = HeapNumber::cast(this)->value();
+    if (FastI2D(FastD2I(num)) == num) {
+      *value = FastD2I(num);
+      return true;
+    }
+  }
+  return false;
+}
+
+
+bool Object::ToUint32(uint32_t* value) {
+  if (IsSmi()) {
+    int num = Smi::cast(this)->value();
+    if (num >= 0) {
+      *value = static_cast<uint32_t>(num);
+      return true;
+    }
+  }
+  if (IsHeapNumber()) {
+    double num = HeapNumber::cast(this)->value();
+    if (num >= 0 && FastUI2D(FastD2UI(num)) == num) {
+      *value = FastD2UI(num);
+      return true;
+    }
+  }
+  return false;
+}
+
+
 template<typename To>
 static inline To* CheckedCast(void *from) {
   uintptr_t temp = reinterpret_cast<uintptr_t>(from);
   ASSERT(temp % sizeof(To) == 0);
   return reinterpret_cast<To*>(temp);
 }
 
 
 static MaybeObject* PerformCompare(const BitmaskCompareDescriptor& descriptor,
                                    char* ptr,
@@ skipping 15474 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal