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[Bug math/10357] casinh(x) loses precision near x=0
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Sat, 03 Mar 2012 21:32:35 +0000
- Subject: [Bug math/10357] casinh(x) loses precision near x=0
- Auto-submitted: auto-generated
- References: <bug-10357-131@http.sourceware.org/bugzilla/>
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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