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[Bug-gsl] [bug #43015] eigen test fails on 32-bit (x86) Linux with -O3
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From: |
Patrick Alken |
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Subject: |
[Bug-gsl] [bug #43015] eigen test fails on 32-bit (x86) Linux with -O3 |
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Date: |
Mon, 18 Aug 2014 18:20:41 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 |
Follow-up Comment #1, bug #43015 (project gsl):
The problem is most likely due to these lines of eigen/test.c:
1270 gsl_eigen_nonsymmv_sort(w->eval, NULL, GSL_EIGEN_SORT_ABS_ASC);
1271 gsl_eigen_nonsymmv_sort(w->evalv, NULL, GSL_EIGEN_SORT_ABS_ASC);
1272 test_eigenvalues_complex(w->evalv, w->eval, "gen", desc);
With the extra optimization, the magnitudes of the eigenvalues could be
slightly different leading to a different sort result. Perhaps the solution is
to sort first by real part, then by imaginary part
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