Optimize the equality check case of ICCompare stubs.

src/ia32/ic-ia32.cc

Index: src/ia32/ic-ia32.cc
===================================================================
--- src/ia32/ic-ia32.cc	(revision 9957)
+++ src/ia32/ic-ia32.cc	(working copy)
@@ -1625,7 +1625,14 @@
     rewritten = stub.GetCode();
   } else {
     ICCompareStub stub(op_, state);
-    rewritten = stub.GetCode();
+    if (state == KNOWN_OBJECTS) {
+      stub.set_known_map(Handle<JSObject>::cast(x)->map());
+      rewritten = stub.GetCode(true);

[Kevin Millikin (Chromium), 2011/11/10 19:08:42]

Nicer to have a virtual "UseSpecialCache" function you can override for just
this stub, instead of the parameter (with a default, and a boolean).

[Rico, 2011/11/11 08:49:11]

Done.

+    } else {
+        rewritten = stub.GetCode();
+    }
+
+
   }
   set_target(*rewritten);