Simple optimization by Christian Tismer, who gives credit to Lenny
Kneler for reporting this issue: long_mult() is faster when the
smaller argument is on the left. Swap the arguments accordingly.
diff --git a/Objects/longobject.c b/Objects/longobject.c
index d5c2f5f..a9ce6f3 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -1223,6 +1223,15 @@
size_a = ABS(a->ob_size);
size_b = ABS(b->ob_size);
+ if (size_a > size_b) {
+ /* we are faster with the small object on the left */
+ int hold_sa = size_a;
+ PyLongObject *hold_a = a;
+ size_a = size_b;
+ size_b = hold_sa;
+ a = b;
+ b = hold_a;
+ }
z = _PyLong_New(size_a + size_b);
if (z == NULL)
return NULL;