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* [Bug math/16287] New: ldbl-128 erfl spurious underflows
@ 2013-12-03 1:04 jsm28 at gcc dot gnu.org
2014-06-13 11:49 ` [Bug math/16287] " fweimer at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-12-03 1:04 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16287
Bug ID: 16287
Summary: ldbl-128 erfl spurious underflows
Product: glibc
Version: 2.19
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
This bug report is from inspection of the ldbl-128 s_erfl.c, not from runtime
testing. erfl is implemented to call __erfcl for arguments with absolute value
at least 1.0. For large arguments where __erfcl underflows, this will result
in spurious exceptions when the result of erfl is very close to 1 and doesn't
underflow itself.
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* [Bug math/16287] ldbl-128 erfl spurious underflows
2013-12-03 1:04 [Bug math/16287] New: ldbl-128 erfl spurious underflows jsm28 at gcc dot gnu.org
@ 2014-06-13 11:49 ` fweimer at redhat dot com
2014-06-24 20:58 ` cvs-commit at gcc dot gnu.org
2014-06-24 20:58 ` jsm28 at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 11:49 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16287
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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* [Bug math/16287] ldbl-128 erfl spurious underflows
2013-12-03 1:04 [Bug math/16287] New: ldbl-128 erfl spurious underflows jsm28 at gcc dot gnu.org
2014-06-13 11:49 ` [Bug math/16287] " fweimer at redhat dot com
2014-06-24 20:58 ` cvs-commit at gcc dot gnu.org
@ 2014-06-24 20:58 ` jsm28 at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2014-06-24 20:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16287
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.20.
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* [Bug math/16287] ldbl-128 erfl spurious underflows
2013-12-03 1:04 [Bug math/16287] New: ldbl-128 erfl spurious underflows jsm28 at gcc dot gnu.org
2014-06-13 11:49 ` [Bug math/16287] " fweimer at redhat dot com
@ 2014-06-24 20:58 ` cvs-commit at gcc dot gnu.org
2014-06-24 20:58 ` jsm28 at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2014-06-24 20:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16287
--- Comment #1 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 e7dd3c8c1db8c6d293abb995e033893b7328ad19 (commit)
from 0ea5d373c7984a1da2d0e990c6e78e6d6c24f91b (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=e7dd3c8c1db8c6d293abb995e033893b7328ad19
commit e7dd3c8c1db8c6d293abb995e033893b7328ad19
Author: Joseph Myers <joseph@codesourcery.com>
Date: Tue Jun 24 20:56:56 2014 +0000
Fix ldbl-128 erfl spurious underflows (bug 16287).
This patch fixes bug 16287, spurious underflows from ldbl-128 erfl
arising from it calling erfcl for arguments with absolute value at
least 1.0, although for large positive arguments erfcl correctly
underflows but erfl shouldn't. The fix is simply to avoid calling
erfcl, and just return 1, for arguments above a cut-off large enough
that erfl correctly rounds to-nearest as 1 but not so large that erfcl
underflows.
Tested mips64. Also tested x86_64 and x86 to confirm the new tests
(taken from the tests of erfc) don't cause any problems there; no ulps
updates needed.
[BZ #16287]
* sysdeps/ieee754/ldbl-128/s_erfl.c (__erfl): Return 1 without
calling __erfcl for arguments at least 16.
* math/auto-libm-test-in: Add more tests of erf.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 +
NEWS | 24 ++--
math/auto-libm-test-in | 10 ++
math/auto-libm-test-out | 294 +++++++++++++++++++++++++++++++++++++
sysdeps/ieee754/ldbl-128/s_erfl.c | 2 +
5 files changed, 324 insertions(+), 12 deletions(-)
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2013-12-03 1:04 [Bug math/16287] New: ldbl-128 erfl spurious underflows jsm28 at gcc dot gnu.org
2014-06-13 11:49 ` [Bug math/16287] " fweimer at redhat dot com
2014-06-24 20:58 ` cvs-commit at gcc dot gnu.org
2014-06-24 20:58 ` jsm28 at gcc dot gnu.org
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