Version 2.1.6
Performance improvements for arithmetic operations.
Performance improvements for string operations.
git-svn-id: http://v8.googlecode.com/svn/trunk@4165 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 1acdb2a..c4676fd 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -133,7 +133,8 @@
#ifdef DEBUG
if (!result->IsFailure()) {
// Maps have their own alignment.
- CHECK((OffsetFrom(result) & kMapAlignmentMask) == kHeapObjectTag);
+ CHECK((reinterpret_cast<intptr_t>(result) & kMapAlignmentMask) ==
+ static_cast<intptr_t>(kHeapObjectTag));
}
#endif
return result;
@@ -273,6 +274,25 @@
}
+Object* Heap::PrepareForCompare(String* str) {
+ // Always flatten small strings and force flattening of long strings
+ // after we have accumulated a certain amount we failed to flatten.
+ static const int kMaxAlwaysFlattenLength = 32;
+ static const int kFlattenLongThreshold = 16*KB;
+
+ const int length = str->length();
+ Object* obj = str->TryFlatten();
+ if (length <= kMaxAlwaysFlattenLength ||
+ unflattended_strings_length_ >= kFlattenLongThreshold) {
+ return obj;
+ }
+ if (obj->IsFailure()) {
+ unflattended_strings_length_ += length;
+ }
+ return str;
+}
+
+
int Heap::AdjustAmountOfExternalAllocatedMemory(int change_in_bytes) {
ASSERT(HasBeenSetup());
int amount = amount_of_external_allocated_memory_ + change_in_bytes;