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Reduce branches in PyUnicode_MAX_CHAR_VALUE #92142

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reduce branches
kumaraditya303 May 2, 2022
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kumaraditya303 May 2, 2022
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kumaraditya303 May 2, 2022
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20 changes: 11 additions & 9 deletions Include/cpython/unicodeobject.h
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Original file line number Diff line number Diff line change
Expand Up @@ -436,17 +436,19 @@ static inline Py_UCS4 PyUnicode_MAX_CHAR_VALUE(PyObject *op)
if (PyUnicode_IS_ASCII(op)) {
return 0x7fU;
}

static const Py_UCS4 max_char_values[] = {
0, /* PyUnicode_WCHAR_KIND */
0xffU, /* PyUnicode_1BYTE_KIND */
0xffffU, /* PyUnicode_2BYTE_KIND */
0,
0x10ffffU, /* PyUnicode_4BYTE_KIND */
};
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Since kind is 3 bits, maybe add extra zero entries for a total of 8?

unsigned int kind = PyUnicode_KIND(op);
if (kind == PyUnicode_1BYTE_KIND) {
return 0xffU;
}
if (kind == PyUnicode_2BYTE_KIND) {
return 0xffffU;
}
assert(kind == PyUnicode_4BYTE_KIND);
return 0x10ffffU;
const Py_UCS4 value = max_char_values[kind];
assert(value);
return value;
}

#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
# define PyUnicode_MAX_CHAR_VALUE(op) \
PyUnicode_MAX_CHAR_VALUE(_PyObject_CAST(op))
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