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string_contains(): speed up by avoiding function calls where 

possible.  This always called PyUnicode_Check() and PyString_Check(),
at least one of which would call PyType_IsSubtype().  Also, this would
call PyString_Size() on known string objects.
This commit is contained in:
Guido van Rossum 2002-08-24 06:57:49 +00:00
parent 9d6897accc
commit bf935fde15
1 changed files with 12 additions and 9 deletions
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9
Objects/stringobject.c
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@ -991,6 +991,8 @@ string_contains(PyObject *a, PyObject *el)
{
const char *lhs, *rhs, *end;
int size;
if (!PyString_CheckExact(el)) {
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(el))
return PyUnicode_Contains(a, el);
@ -1000,15 +1002,16 @@ string_contains(PyObject *a, PyObject *el)
"'in <string>' requires string as left operand");
return -1;
}
size = PyString_Size(el);
}
size = PyString_GET_SIZE(el);
rhs = PyString_AS_STRING(el);
lhs = PyString_AS_STRING(a);
/* optimize for a single character */
if (size == 1)
return memchr(lhs, *rhs, PyString_Size(a)) != NULL;
return memchr(lhs, *rhs, PyString_GET_SIZE(a)) != NULL;
end = lhs + (PyString_Size(a) - size);
end = lhs + (PyString_GET_SIZE(a) - size);
while (lhs <= end) {
if (memcmp(lhs++, rhs, size) == 0)
return 1;