Issue #16096: port fix from 3.3
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commit
cf46d62fcb
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@ -668,10 +668,9 @@ _PyLong_NumBits(PyObject *vv)
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assert(ndigits == 0 || v->ob_digit[ndigits - 1] != 0);
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if (ndigits > 0) {
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digit msd = v->ob_digit[ndigits - 1];
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result = (ndigits - 1) * PyLong_SHIFT;
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if (result / PyLong_SHIFT != (size_t)(ndigits - 1))
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if ((size_t)(ndigits - 1) > PY_SIZE_MAX / (size_t)PyLong_SHIFT)
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goto Overflow;
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result = (size_t)(ndigits - 1) * (size_t)PyLong_SHIFT;
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do {
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++result;
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if (result == 0)
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