[pypy-commit] pypy default: optimization for the union of two sets using the object strategy

[l.diekmann]

Author: l.diekmann
Branch: 
Changeset: r55717:452bb2805140
Date: 2012-06-19 18:19 +0200
http://bitbucket.org/pypy/pypy/changeset/452bb2805140/

Log:	optimization for the union of two sets using the object strategy

diff --git a/pypy/objspace/std/setobject.py b/pypy/objspace/std/setobject.py
--- a/pypy/objspace/std/setobject.py
+++ b/pypy/objspace/std/setobject.py
@@ -777,6 +777,13 @@
 
     def update(self, w_set, w_other):
         d_obj = self.unerase(w_set.sstorage)
+
+        # optimization only
+        if w_other.strategy is self:
+            d_other = self.unerase(w_other.sstorage)
+            d_obj.update(d_other)
+            return
+
         w_iterator = w_other.iter()
         while True:
             w_item = w_iterator.next_entry()