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[3.12] gh-111933: fix broken link to A.Neumaier article (gh-111937) (gh-111993)

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Miss Islington (bot) 2023-11-12 02:22:44 +01:00 • committed by GitHub
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Python/bltinmodule.c
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@ -2605,7 +2605,10 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
}
if (PyFloat_CheckExact(item)) {
// Improved Kahan–Babuška algorithm by Arnold Neumaier
// https://www.mat.univie.ac.at/~neum/scan/01.pdf
// Neumaier, A. (1974), Rundungsfehleranalyse einiger Verfahren
// zur Summation endlicher Summen. Z. angew. Math. Mech.,
// 54: 39-51. https://doi.org/10.1002/zamm.19740540106
// https://en.wikipedia.org/wiki/Kahan_summation_algorithm#Further_enhancements
double x = PyFloat_AS_DOUBLE(item);
double t = f_result + x;
if (fabs(f_result) >= fabs(x)) {