#11920: Sympow needs specify -ffp-contract=on and should create datafiles
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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:9 leif]:
> With GCC versions prior to 4.6, you might have to specify e.g. `-fno-
fused-madd` instead on some platforms, so you could also check whether
that's supported and use it in case it is.
Good point, I will add that flag.
> [Although it's not immediately clear to me whether that's desirable at
all; with (fused) multiply-accumulate, the results are ''more'' accurate
than without. They'll of course frequently differ slightly from what you
get ''with'' strict IEEE 754 compliance.]
This is certainly desirable. SYMPOW really requires strict IEEE-754
compliance, anything ''more'' precise is bad.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11920#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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