# HG changeset patch
# Parent  48d622437f8384bcb9e41056f243cd48b09afc89
Issue #1621: Don’t rely on left shift overflow producing negative value

diff -r 48d622437f83 -r 44e7c61d8294 Objects/setobject.c
--- a/Objects/setobject.c	Thu Jul 14 06:55:09 2016 +0000
+++ b/Objects/setobject.c	Thu Jul 14 12:34:50 2016 +0000
@@ -308,14 +308,12 @@
 
     /* Find the smallest table size > minused. */
     /* XXX speed-up with intrinsics */
-    for (newsize = PySet_MINSIZE;
-         newsize <= minused && newsize > 0;
-         newsize <<= 1)
-        ;
-    if (newsize <= 0) {
+    if (minused > PY_SSIZE_T_MAX >> 1) {
         PyErr_NoMemory();
         return -1;
     }
+    for (newsize = PySet_MINSIZE; newsize <= minused; newsize <<= 1)
+        ;
 
     /* Get space for a new table. */
     oldtable = so->table;