[Bug math/5159] Inaccuracies in tgammaf

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=5159

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
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--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-02-29 19:57:17 UTC ---
You didn't mention what architecture this was on.  Anyway, confirmed with
current sources on x86, and with more and greater errors on x86_64 (I suppose
excess precision is helping a bit on x86).  Presumably the same cause as other
tgamma bugs - all five versions (flt-32, dbl-64, ldbl-96, ldbl-128,
ldbl-128ibm) follow the same approach of exp (lgamma) which is problematic for
results with large (positive or negative) exponent and needs better
implementations for all five cases.

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