bpo-41902: Micro optimization for range.index if step is 1 (GH-22479)
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Micro optimization for range.index if step is 1. Patch by Dong-hee Na.
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@ -582,13 +582,19 @@ range_index(rangeobject *r, PyObject *ob)
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return NULL;
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if (contains) {
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PyObject *idx, *tmp = PyNumber_Subtract(ob, r->start);
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if (tmp == NULL)
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PyObject *idx = PyNumber_Subtract(ob, r->start);
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if (idx == NULL) {
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return NULL;
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}
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if (r->step == _PyLong_One) {
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return idx;
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}
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/* idx = (ob - r.start) // r.step */
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idx = PyNumber_FloorDivide(tmp, r->step);
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Py_DECREF(tmp);
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return idx;
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PyObject *sidx = PyNumber_FloorDivide(idx, r->step);
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Py_DECREF(idx);
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return sidx;
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}
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/* object is not in the range */
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