#21119: Fix numerical noise on Haswell (single doctest)
-------------------------------------+-------------------------------------
Reporter: leif | Type: defect
Status: new | Priority: trivial
Milestone: sage-7.3 | Component: porting
Keywords: | Merged in:
Authors: Leif Leonhardy | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/leif/haswell_noise | 34a1ddc84850ace439d3fe4cec7923347ba69780
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Fixes numerical noise in a single doctest in
`sage/matrix/matrix_double_dense.pyx` on Intel Haswell.
The doctest fails when doing a native build with any GCC version that
supports Haswell:
{{{
**********************************************************************
File "src/sage/matrix/matrix_double_dense.pyx", line 3761, in
sage.matrix.matrix_double_dense.Matrix_double_dense.exp
Failed example:
A.exp() # tol 1e-14
Expected:
[-19.614602953804912 + 12.517743846762578*I 3.7949636449582176 +
28.88379930658099*I]
[ -32.383580980922254 + 21.88423595789845*I 2.269633004093535 +
44.901324827684824*I]
Got:
[-19.614602953804923 + 12.517743846762574*I 3.7949636449582007 +
28.883799306580993*I]
[-32.383580980922275 + 21.884235957898447*I 2.2696330040935115 +
44.901324827684846*I]
Tolerance exceeded in 1 of 8:
2.269633004093535 vs 2.2696330040935115, tolerance 1e-14 > 1e-14
**********************************************************************
1 item had failures:
1 of 11 in sage.matrix.matrix_double_dense.Matrix_double_dense.exp
[636 tests, 1 failure, 3.14 s]
}}}
I've simply increased the tolerance from 1e-14 to 1.5e-14.
--
Ticket URL: <https://trac.sagemath.org/ticket/21119>
Sage <http://www.sagemath.org>
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