#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:
------------------------------+---------------------------------------------
Comment(by 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. So you should probably change your check to detect whether the
doubles are 64-bit / have a 53-bit mantissa.
Only the optional ones fail (differently); one has to compute extra data
(with PARI/GP) for these anyway. With the p10 I get:
{{{
sage -t -long -optional "devel/sage/sage/lfunctions/sympow.py"
**********************************************************************
File ".../sage/lfunctions/sympow.py", line 127:
sage: a = sympow.L(EllipticCurve('11a'), 2, 16); a # optional
Expected:
'1.057599244590958E+00'
Got:
'-4.967915042710588E+11'
**********************************************************************
File ".../sage/lfunctions/sympow.py", line 129:
sage: RR(a) # optional -- requires precomputations
Expected:
1.05759924459096
Got:
-4.96791504271059e11
**********************************************************************
1 items had failures:
2 of 5 in __main__.example_4
***Test Failed*** 2 failures.
For whitespace errors, see the file /home/leif/.sage//tmp/sympow_52568.py
[12.7 s]
}}}
Fairly loud noise... :-)
(Might be that the data in the "manually" computed file is just wrong.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11920#comment:13>
Sage <http://www.sagemath.org>
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