Public bug reported:
Originally reported in https://bugs.debian.org/906198
The following simple test fails on s390x:
---------------------------8<------------------------------
import numpy as np
from scipy.optimize import leastsq
y = np.array([0., 1., 1., 2., 1., 1., 0.])
x = np.arange(len(y))
def func(par):
return par[2] * np.exp(-(x - par[0])**2/par[1]) - y
print(leastsq(func, [0,1,0]))
---------------------------8<------------------------------
The expected result is
(array([3. , 4.42280548, 1.67210345]), 1)
while on S390x, one gets
(array([0. , 1. , 0.34027645]), 3)
Further information from https://bugs.debian.org/915738
The bug seems to be a miscompilation of scipy/optimize/minpack/qrsolv.f
with -funroll-loops. Removing -funroll-loops is enough to get the
leastsq testcase to pass.
** Affects: gcc-8 (Ubuntu)
Importance: Undecided
Status: New
** Affects: imexam (Ubuntu)
Importance: Undecided
Status: New
** Affects: python-scipy (Ubuntu)
Importance: Undecided
Status: New
** Affects: python-scipy (Debian)
Importance: Unknown
Status: Unknown
** Bug watch added: Debian Bug tracker #915738
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915738
** Also affects: python-scipy (Debian) via
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915738
Importance: Unknown
Status: Unknown
** Also affects: imexam (Ubuntu)
Importance: Undecided
Status: New
** Also affects: gcc-8 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1811798
Title:
gcc 8 miscompiles scipy/optimize/minpack/qrsolv.f
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