Speedup the inner loops for dropwhile(), islice(), ifilter(), and
ifilterfalse().
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 517975b..3ad26d5 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -835,10 +835,12 @@
PyObject *item, *good;
PyObject *it = lz->it;
long ok;
+ PyObject *(*iternext)(PyObject *);
+ assert(PyIter_Check(it));
+ iternext = *it->ob_type->tp_iternext;
for (;;) {
- assert(PyIter_Check(it));
- item = (*it->ob_type->tp_iternext)(it);
+ item = iternext(it);
if (item == NULL)
return NULL;
if (lz->start == 1)
@@ -1170,10 +1172,12 @@
PyObject *item;
PyObject *it = lz->it;
long oldnext;
+ PyObject *(*iternext)(PyObject *);
+ assert(PyIter_Check(it));
+ iternext = *it->ob_type->tp_iternext;
while (lz->cnt < lz->next) {
- assert(PyIter_Check(it));
- item = (*it->ob_type->tp_iternext)(it);
+ item = iternext(it);
if (item == NULL)
return NULL;
Py_DECREF(item);
@@ -1182,7 +1186,7 @@
if (lz->stop != -1 && lz->cnt >= lz->stop)
return NULL;
assert(PyIter_Check(it));
- item = (*it->ob_type->tp_iternext)(it);
+ item = iternext(it);
if (item == NULL)
return NULL;
lz->cnt++;
@@ -1783,10 +1787,12 @@
PyObject *item;
PyObject *it = lz->it;
long ok;
+ PyObject *(*iternext)(PyObject *);
+ assert(PyIter_Check(it));
+ iternext = *it->ob_type->tp_iternext;
for (;;) {
- assert(PyIter_Check(it));
- item = (*it->ob_type->tp_iternext)(it);
+ item = iternext(it);
if (item == NULL)
return NULL;
@@ -1932,10 +1938,12 @@
PyObject *item;
PyObject *it = lz->it;
long ok;
+ PyObject *(*iternext)(PyObject *);
+ assert(PyIter_Check(it));
+ iternext = *it->ob_type->tp_iternext;
for (;;) {
- assert(PyIter_Check(it));
- item = (*it->ob_type->tp_iternext)(it);
+ item = iternext(it);
if (item == NULL)
return NULL;