From: Dong-hee Na <donghee.na92@gmail.com>
Date: Wed, 22 Jan 2020 17:36:54 +0000 (+0900)
Subject: bpo-39425: Fix list.count performance regression (GH-18119)
X-Git-Tag: v3.9.0a3~28
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=14d80d0b605d8b148e14458e4c1853a940071462;p=thirdparty%2FPython%2Fcpython.git

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



https://bugs.python.org/issue39425



Automerge-Triggered-By: @pablogsal
---

diff --git a/Objects/listobject.c b/Objects/listobject.c
index bc8425cae63e..a4e90dbf90cf 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2584,6 +2584,10 @@ 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);