From: Raymond Hettinger <python@rcn.com>
Date: Tue, 18 Mar 2008 23:22:29 +0000 (+0000)
Subject: Speed-up isinstance() for one easy case.
X-Git-Tag: v2.6a2~250
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9a47e6201f7604f96d302d90eea2a1dd382c491f;p=thirdparty%2FPython%2Fcpython.git

Speed-up isinstance() for one easy case.
---

diff --git a/Objects/abstract.c b/Objects/abstract.c
index 0ea26d6e4b7f..3315b0eb632d 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2909,6 +2909,11 @@ PyObject_IsInstance(PyObject *inst, PyObject *cls)
 	static PyObject *name = NULL;
 	PyObject *t, *v, *tb;
 	PyObject *checker;
+
+	/* Quick test for an exact match */
+	if (Py_TYPE(inst) == cls)
+		return 1;
+
 	PyErr_Fetch(&t, &v, &tb);
 
 	if (name == NULL) {