mercurial/revset.py

--- a/mercurial/revset.py	Mon Oct 06 11:03:30 2014 -0700
+++ b/mercurial/revset.py	Fri Oct 03 03:19:23 2014 -0500
@@ -2332,6 +2332,18 @@
         self._list = data
         self._set = None
 
+    @util.propertycache
+    def _asclist(self):
+        asclist = self._list[:]
+        asclist.sort()
+        return asclist
+
+    def fastasc(self):
+        return iter(self._asclist)
+
+    def fastdesc(self):
+        return reversed(self._asclist)
+
     def set(self):
         """Returns a set or a smartset containing all the elements.