[Bug libc/3783] New: tan(double x) takes excessive amount of time when x is a multiple of pi/2, x != 0

["rjmarsan at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://launchpad.net/distros/ubuntu/+source/glibc/+bug/53312

(basically just forewarding what the guy wrote)
Architecture: amd64
glibc version 2.3.6-0ubuntu2
gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)

For most values of x, calling tan(x) takes less than a microsecond. However,
when x = n*pi/2, n != 0, calling tan(x) takes several hundred microseconds
(which it clearly shouldn't do).

This doesn't occur when using the tanl or tanf functions.

-- 
           Summary: tan(double x) takes excessive amount of time when x is a
                    multiple of pi/2, x != 0
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: rjmarsan at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3783

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