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bpo-41902: Micro optimization for range.index if step is 1 (GH-22479)

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Dong-hee Na 2020-10-21 11:29:56 +09:00 committed by GitHub
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commit c0f22fb8b3
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2 changed files with 12 additions and 5 deletions
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Misc/NEWS.d/next/Core and Builtins/2020-10-01-22-44-23.bpo-41902.iLoMVF.rst Normal file
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@ -0,0 +1 @@
Micro optimization for range.index if step is 1. Patch by Dong-hee Na.

16
Objects/rangeobject.c
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@ -582,15 +582,21 @@ range_index(rangeobject *r, PyObject *ob)
return NULL; return NULL;
if (contains) { if (contains) {
PyObject *idx, *tmp = PyNumber_Subtract(ob, r->start); PyObject *idx = PyNumber_Subtract(ob, r->start);
if (tmp == NULL) if (idx == NULL) {
return NULL; return NULL;
/* idx = (ob - r.start) // r.step */ }
idx = PyNumber_FloorDivide(tmp, r->step);
Py_DECREF(tmp); if (r->step == _PyLong_One) {
return idx; return idx;
} }
/* idx = (ob - r.start) // r.step */
PyObject *sidx = PyNumber_FloorDivide(idx, r->step);
Py_DECREF(idx);
return sidx;
}
/* object is not in the range */ /* object is not in the range */
PyErr_Format(PyExc_ValueError, "%R is not in range", ob); PyErr_Format(PyExc_ValueError, "%R is not in range", ob);
return NULL; return NULL;