commit fdb21609d944941f0732df72dc3d07a7a9a7efea
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Jan 22 10:11:22 2020 -0800
committer Pablo Galindo <Pablogsal@gmail.com> Wed Jan 22 18:11:22 2020 +0000
tree 02af74b84d16be8d382eb484f7cb764ee874f567
parent f84f65be5602e561fef04b66bb487fbc4e560db5

bpo-39425: Fix list.count performance regression (GH-18119) (GH-18120)

https://bugs.python.org/issue39425

Automerge-Triggered-By: @pablogsal
(cherry picked from commit 14d80d0b605d8b148e14458e4c1853a940071462)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>

Objects/listobject.c

diff --git a/Objects/listobject.c b/Objects/listobject.c
index d506c08..73afc44 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2586,6 +2586,10 @@
 
     for (i = 0; i < Py_SIZE(self); i++) {
         PyObject *obj = self->ob_item[i];
+        if (obj == value) {
+           count++;
+           continue;
+        }
         Py_INCREF(obj);
         int cmp = PyObject_RichCompareBool(obj, value, Py_EQ);
         Py_DECREF(obj);