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Speedup for-loops by inlining PyIter_Next(). Saves duplicate tests

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and a function call resulting in a 15% reduction of total loop overhead
(as measured by timeit.Timer('pass')).
This commit is contained in:
Raymond Hettinger 2004-03-12 08:41:36 +00:00
parent c1e4f9dd92
commit db0de9e7ca
1 changed files with 10 additions and 8 deletions
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18
Python/ceval.c
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@ -2091,21 +2091,23 @@ eval_frame(PyFrameObject *f)
case FOR_ITER:
/* before: [iter]; after: [iter, iter()] *or* [] */
v = TOP();
x = PyIter_Next(v);
x = (*v->ob_type->tp_iternext)(v);
if (x != NULL) {
PUSH(x);
PREDICT(STORE_FAST);
PREDICT(UNPACK_SEQUENCE);
continue;
}
if (!PyErr_Occurred()) {
/* iterator ended normally */
x = v = POP();
Py_DECREF(v);
JUMPBY(oparg);
continue;
if (PyErr_Occurred()) {
if (!PyErr_ExceptionMatches(PyExc_StopIteration))
break;
PyErr_Clear();
}
break;
/* iterator ended normally */
x = v = POP();
Py_DECREF(v);
JUMPBY(oparg);
continue;
case SETUP_LOOP:
case SETUP_EXCEPT: