commit fa7880604191f81cbdddc191216f7b1e39a74d8d
author Raymond Hettinger <rhettinger@users.noreply.github.com> Thu Jan 18 13:23:27 2018 -0800
committer GitHub <noreply@github.com> Thu Jan 18 13:23:27 2018 -0800
tree 717374dbca22af768b2333133e291f5a98907e35
parent 05d68a8bd84cb141be9f9335f5b3540f15a989c4

Removed unnecesssary bit inversion which doesn't improve dispersion statistics (#5235)

Objects/setobject.c

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 4bc1020..47db6b2 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -795,7 +795,7 @@
     hash ^= ((Py_uhash_t)PySet_GET_SIZE(self) + 1) * 1927868237UL;
 
     /* Disperse patterns arising in nested frozensets */
-    hash ^= (hash >> 11) ^ (~hash >> 25);
+    hash ^= (hash >> 11) ^ (hash >> 25);
     hash = hash * 69069U + 907133923UL;
 
     /* -1 is reserved as an error code */