--- a/mercurial/manifest.py	Mon Mar 30 11:58:39 2015 -0700
+++ b/mercurial/manifest.py	Fri Mar 27 13:16:13 2015 -0700
@@ -480,19 +480,6 @@
         copy._flags = dict.copy(self._flags)
         return copy
 
-    def _intersectfiles(self, files):
-        '''make a new treemanifest with the intersection of self with files
-
-        The algorithm assumes that files is much smaller than self.'''
-        ret = treemanifest()
-        for fn in files:
-            if fn in self:
-                ret[fn] = self[fn]
-                flags = self.flags(fn)
-                if flags:
-                    ret.setflag(fn, flags)
-        return ret
-
     def filesnotin(self, m2):
         '''Set of files in this manifest that are not in the other'''
         files = set()
@@ -531,11 +518,6 @@
         if match.always():
             return self.copy()
 
-        files = match.files()
-        if (match.isexact() or
-            (not match.anypats() and util.all(fn in self for fn in files))):
-            return self._intersectfiles(files)
-
         m = self.copy()
         for fn in m.keys():
             if not match(fn):