commit b501a27ad8ec4b531a9c1057952d8f7c6ef8cb77
author Raymond Hettinger <python@rcn.com> Thu Aug 06 22:15:22 2015 -0700
committer Raymond Hettinger <python@rcn.com> Thu Aug 06 22:15:22 2015 -0700
tree a6f91d7786d47fe52286239560a7622a54ec83bf
parent 8e9f9852bea430a07af8e33abb1f1b2501e3e3ec

Restore frozenset hash caching removed in cf707dd190a9

Objects/setobject.c

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 24424ad..0a065cc 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -763,6 +763,9 @@
     Py_uhash_t hash = 1927868237UL;
     setentry *entry;
 
+    if (so->hash != -1)
+        return so->hash;
+
     /* Initial dispersion based on the number of active entries */
     hash *= (Py_uhash_t)PySet_GET_SIZE(self) + 1;