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[Bug math/13629] clog() returns wrong values around z=1
- From: "tprince at computer dot org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Fri, 27 Jan 2012 16:00:17 +0000
- Subject: [Bug math/13629] clog() returns wrong values around z=1
- Auto-submitted: auto-generated
- References: <bug-13629-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=13629
Tim Prince <tprince at computer dot org> changed:
What |Removed |Added
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CC| |tprince at computer dot org
--- Comment #3 from Tim Prince <tprince at computer dot org> 2012-01-27 16:00:17 UTC ---
I ran the TOMS 714 test against glibc-2.12-1.7.el6.x86_64 and Intel libimf
(latter requires option -fp-model source).
This test doesn't exercise the neighborhood of (1, 0).
The only outright failure for glibc came with LOG( 0.1797693+309
0.1797693+309).
Otherwise, the maximum errors in each tested region are similar for the two
libraries, but the number of unequal comparisons is about 10 times as many for
glibc.
Comparisons attached:
dclog_gf.txt (gfortran/glibc)
dclog_if.txt (ifort/imf)
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