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[Bug math/5159] Inaccuracies in tgammaf
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Wed, 29 Feb 2012 19:57:17 +0000
- Subject: [Bug math/5159] Inaccuracies in tgammaf
- Auto-submitted: auto-generated
- References: <bug-5159-131@http.sourceware.org/bugzilla/>
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
| |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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