Add complete ElementKind information directly to Map for objects with elements.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 317a14c3ad7091f99aeec3f9b922b33cd8ad14d7..c60e1484e9a2a934f4ccf1ac3257d977d52e2f41 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -279,6 +279,16 @@ void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
 }
 
 
+void MacroAssembler::CheckFastElements(Register map,
+                                       Label* fail,
+                                       Label::Distance distance) {
+  // Check the "has fast elements" bit in the receiver's map.

[Mads Ager (chromium), 2011/05/30 11:14:24]

Remove comment here? Seems redundant with the comment in the header file?

[danno, 2011/06/01 22:29:54]

Done.

+  cmpb(FieldOperand(map, Map::kBitField2Offset),
+       Map::kMaximumBitField2FastElementValue);
+  j(above, fail, distance);
+}
+
+
 void MacroAssembler::CheckMap(Register obj,
                               Handle<Map> map,
                               Label* fail,