[Bug math/5159] Inaccuracies in tgammaf

[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
----------------------------------------------------------------------------
         AssignedTo|aj at suse dot de           |unassigned at sourceware
                   |                            |dot org

--- 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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[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
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> 2013-05-08 12:00:12 UTC ---
Fixed for 2.18 by:

commit d8cd06db62d92f86cc8cc3c0d6a489bd207bb834
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed May 8 11:58:18 2013 +0000

    Improve tgamma accuracy (bugs 2546, 2560, 5159, 15426).

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[Bug math/5159] Inaccuracies in tgammaf

[tkoenig at gcc dot gnu dot org]

------- Additional Comments From tkoenig at gcc dot gnu dot org  2007-11-17 17:07 -------
There now is a C implementaton of the [tl]gamma* functions
in libgfortran, contributed by FX Coudert:

http://gcc.gnu.org/viewcvs/trunk/libgfortran/intrinsics/c99_functions.c?r1=128648&r2=130245

This might be OK for inclusion in glibc.

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[Bug math/5159] Inaccuracies in tgammaf

[tkoenig at gcc dot gnu dot org]

------- Additional Comments From tkoenig at gcc dot gnu dot org  2007-10-14 16:56 -------
Two possible implementations at

http://gcc.gnu.org/ml/fortran/2007-10/msg00197.html
http://gcc.gnu.org/ml/fortran/2007-10/msg00201.html




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