#11920: Sympow needs specify -ffp-contract=on and should create datafiles
------------------------------+---------------------------------------------
Reporter: jdemeyer | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.3
Component: packages | Keywords:
Work_issues: | Upstream: None of the above - read trac
for reasoning.
Reviewer: Leif Leonhardy | Author: Jeroen Demeyer
Merged: | Dependencies:
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Comment(by jdemeyer):
Replying to [comment:13 leif]:
> FWIW, both with the p9 (with `-O3`, and '''without''' `-mno-fused-madd`,
which is AFAIK the default) and with the p10 (with `-mno-fused-madd`) all
(long) tests in
>
> `sage/lfunctions/sympow.py`
>
> pass.
The fact that all tests pass, does not necessarily mean that SYMPOW is
operating correctly. It has been shown that SYMPOW sometimes computes
incorrect results when fused-madd is used. I agree, this was with gcc
4.6.0 on ia64, not gcc 4.4.6 on powerpc, but still...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11920#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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