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* [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag
@ 2012-04-29 21:43 kreckel at ginac dot de
2012-05-05 19:48 ` [Bug math/14036] " jsm28 at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: kreckel at ginac dot de @ 2012-04-29 21:43 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14036
Bug #: 14036
Summary: exp(710.0) fails to set the overflow exception flag
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: kreckel@ginac.de
Classification: Unclassified
Created attachment 6382
--> http://sourceware.org/bugzilla/attachment.cgi?id=6382
test case
Using the current HEAD of glibc on an x86-64 system,
When I run the attached program using current HEAD after compiling glibc on an
x86-64 system, I get:
exp(710) returned inf
IEEE754 exception flags: none
exp(-1234) returned 0
IEEE754 exception flags: none
The first one should have set the OVERFLOW exception flag, the second one the
UNDERFLOW exception flag.
(This appears to have broken recently.)
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* [Bug math/14036] exp(710.0) fails to set the overflow exception flag
2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
@ 2012-05-05 19:48 ` jsm28 at gcc dot gnu.org
2012-05-05 19:49 ` [Bug math/14036] exp(-1234) fails to set the underflow " jsm28 at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-05-05 19:48 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14036
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-05-05 19:47:25 UTC ---
Overflow case fixed by:
commit 41498f4db1ebfeb2fb76b9137cba38c20000f1d3
Author: Joseph Myers <joseph@codesourcery.com>
Date: Sat May 5 19:37:39 2012 +0000
Fix missing exceptions from exp (bugs 13787, 13922, 14036).
The underflow case is probably a compiler bug, wrongly optimizing a
multiplication of two tiny constants to 0, but when Andreas's patch to use
-frounding-math for building libm goes in that should work around that compiler
bug.
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* [Bug math/14036] exp(-1234) fails to set the underflow exception flag
2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
2012-05-05 19:48 ` [Bug math/14036] " jsm28 at gcc dot gnu.org
@ 2012-05-05 19:49 ` jsm28 at gcc dot gnu.org
2012-05-06 12:42 ` jsm28 at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-05-05 19:49 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14036
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
Summary|exp(710.0) fails to set the |exp(-1234) fails to set the
|overflow exception flag |underflow exception flag
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-05-05 19:48:42 UTC ---
(Retitling for the underflow issue and reopening until that is properly fixed.)
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* [Bug math/14036] exp(-1234) fails to set the underflow exception flag
2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
2012-05-05 19:48 ` [Bug math/14036] " jsm28 at gcc dot gnu.org
2012-05-05 19:49 ` [Bug math/14036] exp(-1234) fails to set the underflow " jsm28 at gcc dot gnu.org
@ 2012-05-06 12:42 ` jsm28 at gcc dot gnu.org
2012-05-24 15:40 ` jsm28 at gcc dot gnu.org
2014-06-25 11:10 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-05-06 12:42 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14036
--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-05-06 12:42:14 UTC ---
Underflow case now fixed, presumably by:
commit bd7b0e561f7f684cedfc4adb964569fe9ab16209
Author: Andreas Jaeger <aj@suse.de>
Date: Sun May 6 09:14:15 2012 +0200
Build glibc with -frounding-math
* Makeconfig (+math-flags): New, set to -frounding-math.
(+cflags): Add +math-flags so that all of glibc gets compiled with
it.
Should be closed as fixed once libm-test.inc supports testing underflow
exceptions and an appropriate test has been added.
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* [Bug math/14036] exp(-1234) fails to set the underflow exception flag
2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
` (2 preceding siblings ...)
2012-05-06 12:42 ` jsm28 at gcc dot gnu.org
@ 2012-05-24 15:40 ` jsm28 at gcc dot gnu.org
2014-06-25 11:10 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2012-05-24 15:40 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14036
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-05-24 15:40:25 UTC ---
Testcase added by:
commit 7a25eb06bfa838900bef78b975c38aa7e012b587
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu May 24 15:36:54 2012 +0000
Add tests for underflow exception bugs 10846, 14036.
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* [Bug math/14036] exp(-1234) fails to set the underflow exception flag
2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
` (3 preceding siblings ...)
2012-05-24 15:40 ` jsm28 at gcc dot gnu.org
@ 2014-06-25 11:10 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2014-06-25 11:10 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14036
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-25 11:10 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2012-04-29 21:43 [Bug math/14036] New: exp(710.0) fails to set the overflow exception flag kreckel at ginac dot de
2012-05-05 19:48 ` [Bug math/14036] " jsm28 at gcc dot gnu.org
2012-05-05 19:49 ` [Bug math/14036] exp(-1234) fails to set the underflow " jsm28 at gcc dot gnu.org
2012-05-06 12:42 ` jsm28 at gcc dot gnu.org
2012-05-24 15:40 ` jsm28 at gcc dot gnu.org
2014-06-25 11:10 ` fweimer at redhat dot com
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