[Bug math/10357] casinh(x) loses precision near x=0

[Bug math/10357] casinh(x) loses precision near x=0

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=10357

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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         AssignedTo|aj at suse dot de           |unassigned at sourceware
                   |                            |dot org

--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-03-03 21:32:35 UTC ---
Confirmed that the problematic logic is still present in current glibc.  The
real part of casinh is likely to be inaccurate (close to 0 but not close in
ulps to the correct value) for all inputs near the line segment from -i to i,
not just near 0, since x + sqrt(1 + x*x) maps that segment to |z|=1.

This issue will also affect casin since that's implemented in terms of casinh.

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[Bug math/10357] casinh(x) loses precision near x=0

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=10357

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-03-30 13:34:13 UTC ---
Fixed for 2.18 by:

commit ccc8cadf750fc3626fa418a92642b6127428f404
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Sat Mar 30 13:31:53 2013 +0000

    Fix casinh inaccuracy for imaginary part < 1.0, real part small (bug
10357).

(the last in a series of patches fixing a range of inaccuracy and spurious
exception problems for casinh, casin and cacos).

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[Bug math/10357] casinh(x) loses precision near x=0

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=10357

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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              Flags|                            |security-

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