Mercurial > cpython-lru_cache-weakref
diff Python/ceval.c @ 31646:83b0382e0d36 legacy-trunk
Speedup for-loops by inlining PyIter_Next(). Saves duplicate tests
and a function call resulting in a 15% reduction of total loop overhead
(as measured by timeit.Timer('pass')).
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Fri, 12 Mar 2004 08:41:36 +0000 |
| parents | b4e4dbd24fe7 |
| children | d10c778af167 |
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--- a/Python/ceval.c Fri Mar 12 08:04:00 2004 +0000 +++ b/Python/ceval.c Fri Mar 12 08:41:36 2004 +0000 @@ -2091,21 +2091,23 @@ 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: