From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Wed, 22 Jan 2020 18:11:30 +0000 (-0800)
Subject: bpo-39425: Fix list.count performance regression (GH-18119) (GH-18121)
X-Git-Tag: v3.7.7rc1~77
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e06d61af30bac4fcacb7973f826147ccc010392;p=thirdparty%2FPython%2Fcpython.git

bpo-39425: Fix list.count performance regression (GH-18119) (GH-18121)

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>
---

diff --git a/Objects/listobject.c b/Objects/listobject.c
index d622da9e0dbf..856f3215e885 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2537,6 +2537,10 @@ list_count(PyListObject *self, PyObject *value)
 
     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);