[Python-checkins] CVS: python/dist/src/Objects longobject.c,1.55,1.56
Guido van Rossum
python-dev@python.org
2000年4月10日 13:32:01 -0400 (EDT)
Update of /projects/cvsroot/python/dist/src/Objects
In directory eric:/projects/python/develop/guido/src/Objects
Modified Files:
longobject.c
Log Message:
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.
Index: longobject.c
===================================================================
RCS file: /projects/cvsroot/python/dist/src/Objects/longobject.c,v
retrieving revision 1.55
retrieving revision 1.56
diff -C2 -r1.55 -r1.56
*** longobject.c 2000年04月05日 20:11:20 1.55
--- longobject.c 2000年04月10日 17:31:58 1.56
***************
*** 1224,1227 ****
--- 1224,1236 ----
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)