diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -571,14 +571,6 @@ def _descendants(repo, subset, x, follow
     if not args:
         return []
     s = set(_revdescendants(repo, args, followfirst)) | set(args)
-
-    if len(subset) == len(repo):
-        # the passed in revisions may not exist, -1 for example
-        for arg in args:
-            if arg not in subset:
-                s.remove(arg)
-        return list(s)
-
     return [r for r in subset if r in s]
 
 def descendants(repo, subset, x):
@@ -1336,10 +1328,7 @@ def roots(repo, subset, x):
     Changesets in set with no parent changeset in set.
     """
     s = set(getset(repo, repo.changelog, x))
-    if len(subset) == len(repo):
-        subset = s
-    else:
-        subset = [r for r in subset if r in s]
+    subset = [r for r in subset if r in s]
     cs = _children(repo, subset, s)
     return [r for r in subset if r not in cs]