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* [Bug math/16517] New: Missing underflow exception from tanf
@ 2014-01-31 22:58 zimmerma+gcc at loria dot fr
2014-02-07 7:40 ` [Bug math/16517] " zimmerma+gcc at loria dot fr
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2014-01-31 22:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
Bug ID: 16517
Summary: Missing underflow exception from tanf
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: zimmerma+gcc at loria dot fr
Created attachment 7382
--> https://sourceware.org/bugzilla/attachment.cgi?id=7382&action=edit
test program
on x86_64 the attached test program gives:
GNU libc version: 2.18.90
GNU libc release: development
x=0x1p-149 (1.401298464e-45)
libc: tanf(x)=0x1p-149 (1.401298464e-45) underflow=0
mpfr: tanf(x)=0x1p-149 (1.401298464e-45)
ulp difference: 0.000000
Since the result is the smallest positive subnormal, an underflow exception
should be raised
See http://webloria.loria.fr/~zimmerma/glibc/
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug math/16517] Missing underflow exception from tanf
2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
@ 2014-02-07 7:40 ` zimmerma+gcc at loria dot fr
2014-02-08 7:13 ` [Bug math/16517] Missing underflow exception from tanf/tan/tanl zimmerma+gcc at loria dot fr
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2014-02-07 7:40 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
--- Comment #1 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
same in extended precision:
Testing function tan for exponent 0 [seed=8344].
rounding mode MPFR_RNDU:
wrong underflow flag for x=-8.0000000000000000@-4112
library gives -8.0000000000000000@-4112
mpfr gives -8.0000000000000000@-4112
underflow: mpfr 1, library 0
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug math/16517] Missing underflow exception from tanf/tan/tanl
2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
2014-02-07 7:40 ` [Bug math/16517] " zimmerma+gcc at loria dot fr
@ 2014-02-08 7:13 ` zimmerma+gcc at loria dot fr
2014-06-13 8:49 ` fweimer at redhat dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2014-02-08 7:13 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
Paul Zimmermann <zimmerma+gcc at loria dot fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Missing underflow exception |Missing underflow exception
|from tanf |from tanf/tan/tanl
--- Comment #2 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
idem in double precision:
Testing function tan for exponent 0 [seed=17940].
rounding mode MPFR_RNDU:
wrong underflow flag for x=-4.0000000000000@-269
library gives -4.0000000000000@-269
mpfr gives -4.0000000000000@-269
underflow: mpfr 1, library 0
This is the smallest subnormal 0x1p-1074.
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug math/16517] Missing underflow exception from tanf/tan/tanl
2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
2014-02-07 7:40 ` [Bug math/16517] " zimmerma+gcc at loria dot fr
2014-02-08 7:13 ` [Bug math/16517] Missing underflow exception from tanf/tan/tanl zimmerma+gcc at loria dot fr
@ 2014-06-13 8:49 ` fweimer at redhat dot com
2015-08-07 23:11 ` cvs-commit at gcc dot gnu.org
2015-08-07 23:12 ` jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 8:49 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug math/16517] Missing underflow exception from tanf/tan/tanl
2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
` (2 preceding siblings ...)
2014-06-13 8:49 ` fweimer at redhat dot com
@ 2015-08-07 23:11 ` cvs-commit at gcc dot gnu.org
2015-08-07 23:12 ` jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2015-08-07 23:11 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, master has been updated
via 37550cb3d6591a8f443467707ec80b4ab5c2e157 (commit)
from db2bcbcb631f1c1aa023ef9f23a968e1ac288423 (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=37550cb3d6591a8f443467707ec80b4ab5c2e157
commit 37550cb3d6591a8f443467707ec80b4ab5c2e157
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Aug 7 23:10:35 2015 +0000
Fix tan missing underflows (bug 16517).
Similar to various other bugs in this area, some tan implementations
do not raise the underflow exception for subnormal arguments, when the
result is tiny and inexact. This patch forces the exception in a
similar way to previous fixes.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #16517]
* sysdeps/ieee754/dbl-64/s_tan.c: Include <float.h>.
(tan): Force underflow exception for arguments with small absolute
value.
* sysdeps/ieee754/flt-32/k_tanf.c: Include <float.h>.
(__kernel_tanf): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128/k_tanl.c: Include <float.h>.
(__kernel_tanl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128ibm/k_tanl.c: Include <float.h>.
(__kernel_tanl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-96/k_tanl.c: Include <float.h>.
(__kernel_tanl): Force underflow exception for arguments with
small absolute value.
* math/auto-libm-test-in: Add more tests of tan.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 21 +++
NEWS | 2 +-
math/auto-libm-test-in | 4 +
math/auto-libm-test-out | 316 ++++++++++++++++++++++++++++++++++
sysdeps/ieee754/dbl-64/s_tan.c | 6 +
sysdeps/ieee754/flt-32/k_tanf.c | 13 ++-
sysdeps/ieee754/ldbl-128/k_tanl.c | 12 ++-
sysdeps/ieee754/ldbl-128ibm/k_tanl.c | 12 ++-
sysdeps/ieee754/ldbl-96/k_tanl.c | 12 ++-
9 files changed, 393 insertions(+), 5 deletions(-)
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug math/16517] Missing underflow exception from tanf/tan/tanl
2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
` (3 preceding siblings ...)
2015-08-07 23:11 ` cvs-commit at gcc dot gnu.org
@ 2015-08-07 23:12 ` jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-08-07 23:12 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |2.23
--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.23.
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2014-01-31 22:58 [Bug math/16517] New: Missing underflow exception from tanf zimmerma+gcc at loria dot fr
2014-02-07 7:40 ` [Bug math/16517] " zimmerma+gcc at loria dot fr
2014-02-08 7:13 ` [Bug math/16517] Missing underflow exception from tanf/tan/tanl zimmerma+gcc at loria dot fr
2014-06-13 8:49 ` fweimer at redhat dot com
2015-08-07 23:11 ` cvs-commit at gcc dot gnu.org
2015-08-07 23:12 ` jsm28 at gcc dot gnu.org
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