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* [Bug math/6778] expm1() raises bogus underflow exception for -large
[not found] <bug-6778-131@http.sourceware.org/bugzilla/>
@ 2012-02-29 20:59 ` jsm28 at gcc dot gnu.org
2012-07-06 11:20 ` jsm28 at gcc dot gnu.org
2020-05-23 10:35 ` mtk.manpages at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-02-29 20:59 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=6778
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|aj at suse dot de |unassigned at sourceware
| |dot org
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-02-29 20:59:11 UTC ---
Confirmed on x86 with current sources. Does not appear on x86_64. This is a
quality-of-implementation issue only, since C99 and C11 permit spurious
underflow exceptions (as well as spurious inexact exceptions, and raising
inexact even when the result is exact).
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* [Bug math/6778] expm1() raises bogus underflow exception for -large
[not found] <bug-6778-131@http.sourceware.org/bugzilla/>
2012-02-29 20:59 ` [Bug math/6778] expm1() raises bogus underflow exception for -large jsm28 at gcc dot gnu.org
@ 2012-07-06 11:20 ` jsm28 at gcc dot gnu.org
2020-05-23 10:35 ` mtk.manpages at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-07-06 11:20 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=6778
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-07-06 11:19:45 UTC ---
Fixed for 2.17 by:
commit f17ac40d7cb8e8c462476b6ab703262f6b8f6da8
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Jul 6 11:17:41 2012 +0000
Fix expm1 spurious underflow exceptions (bug 6778).
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* [Bug math/6778] expm1() raises bogus underflow exception for -large
[not found] <bug-6778-131@http.sourceware.org/bugzilla/>
2012-02-29 20:59 ` [Bug math/6778] expm1() raises bogus underflow exception for -large jsm28 at gcc dot gnu.org
2012-07-06 11:20 ` jsm28 at gcc dot gnu.org
@ 2020-05-23 10:35 ` mtk.manpages at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: mtk.manpages at gmail dot com @ 2020-05-23 10:35 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=6778
--- Comment #4 from Michael Kerrisk <mtk.manpages at gmail dot com> ---
Fix documented for man-pages-5.07.
commit 4f16aab8244518d9f46fb6e8d4dc8e6e73266771
Author: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Sat May 23 11:45:36 2020 +0200
expm1.3: The expm1() bogus underflow floating-point exception has been
fixed
Fixed in glibc 2.17.
See https://www.sourceware.org/bugzilla/show_bug.cgi?id=6778
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/man3/expm1.3 b/man3/expm1.3
index a1fe0f7b2..460068a6d 100644
--- a/man3/expm1.3
+++ b/man3/expm1.3
@@ -144,13 +144,14 @@ T} Thread safety MT-Safe
C99, POSIX.1-2001, POSIX.1-2008.
.\" BSD.
.SH BUGS
-For some large negative
+Before glibc 2.17,
+.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6778
+on certain architectures (e.g., x86, but not x86_64)
+.BR expm1 ()
+raised a bogus underflow floating-point exception
+for some large negative
.I x
values (where the function result approaches \-1),
-.BR expm1 ()
-raises a bogus underflow floating-point exception.
-.\" FIXME .
-.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6778
.PP
For some large positive
.I x
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* [Bug math/6778] expm1() raises bogus underflow exception for -large
2008-07-30 11:06 [Bug math/6778] New: " mtk dot manpages at gmail dot com
@ 2008-07-31 8:30 ` mtk dot manpages at gmail dot com
0 siblings, 0 replies; 4+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 8:30 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 08:29 -------
Created an attachment (id=2843)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2843&action=view)
test program
Example runs showing problem:
$ /tmp/mt_expm1 -- -1e5
errno == 0
fetestexcept() says: FE_UNDERFLOW FE_INEXACT
expm1(-1.00000000000000000e+05)=-1.00000000000000000e+00
0 FE_UNDERFLOW normal
$ /tmp/mt_expm1 -- -1e308
errno == 0
fetestexcept() says: FE_UNDERFLOW FE_INEXACT
expm1(-1.00000000000000001e+308)=-1.00000000000000000e+00
0 FE_UNDERFLOW normal
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2012-02-29 20:59 ` [Bug math/6778] expm1() raises bogus underflow exception for -large jsm28 at gcc dot gnu.org
2012-07-06 11:20 ` jsm28 at gcc dot gnu.org
2020-05-23 10:35 ` mtk.manpages at gmail dot com
2008-07-30 11:06 [Bug math/6778] New: " mtk dot manpages at gmail dot com
2008-07-31 8:30 ` [Bug math/6778] " mtk dot manpages at gmail dot com
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