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GH-107596: Specialize str[int] (GH-107597)

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Brandt Bucher 2023-08-08 13:42:43 -07:00 • committed by GitHub
parent aab6f7173a
commit ea72c6fe3b
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10 changed files with 172 additions and 97 deletions
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16
Python/bytecodes.c
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@ -509,6 +509,7 @@ dummy_func(
BINARY_SUBSCR_DICT,
BINARY_SUBSCR_GETITEM,
BINARY_SUBSCR_LIST_INT,
BINARY_SUBSCR_STR_INT,
BINARY_SUBSCR_TUPLE_INT,
};
@ -574,6 +575,21 @@ dummy_func(
Py_DECREF(list);
}
inst(BINARY_SUBSCR_STR_INT, (unused/1, str, sub -- res)) {
DEOPT_IF(!PyLong_CheckExact(sub), BINARY_SUBSCR);
DEOPT_IF(!PyUnicode_CheckExact(str), BINARY_SUBSCR);
DEOPT_IF(!_PyLong_IsNonNegativeCompact((PyLongObject *)sub), BINARY_SUBSCR);
Py_ssize_t index = ((PyLongObject*)sub)->long_value.ob_digit[0];
DEOPT_IF(PyUnicode_GET_LENGTH(str) <= index, BINARY_SUBSCR);
// Specialize for reading an ASCII character from any string:
Py_UCS4 c = PyUnicode_READ_CHAR(str, index);
DEOPT_IF(Py_ARRAY_LENGTH(_Py_SINGLETON(strings).ascii) <= c, BINARY_SUBSCR);
STAT_INC(BINARY_SUBSCR, hit);
res = (PyObject*)&_Py_SINGLETON(strings).ascii[c];
_Py_DECREF_SPECIALIZED(sub, (destructor)PyObject_Free);
Py_DECREF(str);
}
inst(BINARY_SUBSCR_TUPLE_INT, (unused/1, tuple, sub -- res)) {
DEOPT_IF(!PyLong_CheckExact(sub), BINARY_SUBSCR);
DEOPT_IF(!PyTuple_CheckExact(tuple), BINARY_SUBSCR);