Do inline object filtering (via page flags) before call to RecordWriteStub.

src/ia32/macro-assembler-ia32-inl.h

Index: src/ia32/macro-assembler-ia32-inl.h
diff --git a/src/ia32/macro-assembler-ia32-inl.h b/src/ia32/macro-assembler-ia32-inl.h
index 8e0e59f86415ba3f17e84bda137fcbbf75a87233..5dc5fd26cfbc6501734c86f8091267eae41587ec 100644
--- a/src/ia32/macro-assembler-ia32-inl.h
+++ b/src/ia32/macro-assembler-ia32-inl.h
@@ -33,17 +33,22 @@
 namespace v8 {
 namespace internal {
 
+
 template<typename LabelType>
-void MacroAssembler::HasScanOnScavenge(Register object,
-                                       Register scratch,
-                                       LabelType* scan_on_scavenge) {
+void MacroAssembler::CheckPageFlag(
+    Register object,
+    Register scratch,
+    MemoryChunk::MemoryChunkFlags flag,
+    Condition cc,
+    LabelType* not_set) {

[Erik Corry, 2011/05/11 18:53:57]

not_set seems like the wrong name, since it means is_set if the condition is
not_zero.  How about condition_met?

[Vyacheslav Egorov (Chromium), 2011/05/13 11:06:52]

Done.

   Move(scratch, object);
   and_(scratch, ~Page::kPageAlignmentMask);
-  cmpb(Operand(scratch, MemoryChunk::kScanOnScavengeOffset), 0);
-  j(not_equal, scan_on_scavenge);
+  test(Operand(scratch, MemoryChunk::kFlagsOffset), Immediate(1 << flag));
+  j(cc, not_set);
 }
 
 
+
 template<typename LabelType>
 void MacroAssembler::InOldSpaceIsBlack(Register object,
                                        Register scratch0,