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


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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