tree 751766986c00b71afdedcca0664f0890d08e62c9
parent f2f2a2c130fc41bc854f376e13f4d6193a2b8b02
author Guido van Rossum <guido@python.org> 1029772953 +0000
committer Guido van Rossum <guido@python.org> 1029772953 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4028297

Simple but important optimization for descr_check(): instead of the
expensive and overly general PyObject_IsInstance(), call
PyObject_TypeCheck() which is a macro that often avoids a call, and if
it does make a call, calls the much more efficient PyType_IsSubtype().
This saved 6% on a benchmark for slot lookups.