[pkg-boost-devel] Bug#584325: [noreply at lists.boost.org: Re: [Boost C++ Libraries] #2769: x86_64 + g++: wrong results for sin()]

[Steve M. Robbins]

Further information from the Boost bug tracker (below).  It appears
this is a bug in the math library [1] and has been known for
nearly 8 years [2].

-Steve
[1] http://sourceware.org/bugzilla/show_bug.cgi?id=3976
[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=153022


#2769: x86_64 + g++: wrong results for sin()
--------------------------------------------+-------------------------------
 Reporter:  anonymous                       |       Owner:  bgubenko
     Type:  Bugs                            |      Status:  new     
Milestone:                                  |   Component:  interval
  Version:  Boost 1.34.1                    |    Severity:  Problem 
 Keywords:  x86_64 interval transcendental  |  
--------------------------------------------+-------------------------------

Comment(by jewillco):

 The underlying C cos function has problems as well, even outside
 Boost.Interval.  This bug appears to be a manifestation of something like
 http://sourceware.org/bugzilla/show_bug.cgi?id=3976 (which also applies to
 many other functions).  According to that discussion, though, the standard
 library is not required to respect round-down or round-up for
 transcendental functions at all.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2769#comment:2>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.

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