This is the mail archive of the
glibc-bugs@sourceware.org
mailing list for the glibc project.
[Bug math/18875] Excess precision leads incorrect libm
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 15 Sep 2015 16:51:07 +0000
- Subject: [Bug math/18875] Excess precision leads incorrect libm
- Auto-submitted: auto-generated
- References: <bug-18875-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18875
--- Comment #6 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 828bf6828b048b1482e95f84ca92e5fe0edcdc0c (commit)
from 333ceaa54bc27de48fc6eecc7b0a3e75a0c5ce50 (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=828bf6828b048b1482e95f84ca92e5fe0edcdc0c
commit 828bf6828b048b1482e95f84ca92e5fe0edcdc0c
Author: Joseph Myers <joseph@codesourcery.com>
Date: Tue Sep 15 16:50:02 2015 +0000
Fix i386 exp10 missing underflows (bug 18966).
On i386, the double version of exp10 can miss underflow exceptions if
the result is in the subnormal range for double but the last 11 bits
of the 64-bit extended-precision mantissa happen to be zero. This
patch forces the exception in a similar way to previous fixes.
As with the exp2 and exp fixes, the exp10f changes may in fact not be
needed to ensure underflow exceptions, but are included for
consistency and to fix the exp10 part of bug 18875 by ensuring that
excess range and precision is removed from underflowing return values.
Tested for x86_64 and x86.
[BZ #18875]
[BZ #18966]
* sysdeps/i386/fpu/e_exp10.S (dbl_min): New object.
(MO): New macro.
(__ieee754_exp10): For small results, force underflow exception
and remove excess range and precision from return value.
* sysdeps/i386/fpu/e_exp10f.S (flt_min): New object.
(MO): New macro.
(__ieee754_exp10f): For small results, force underflow exception
and remove excess range and precision from return value.
* math/auto-libm-test-in: Add more tests of exp10.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 15 ++++
NEWS | 3 +-
math/auto-libm-test-in | 3 +
math/auto-libm-test-out | 163 +++++++++++++++++++++++++++++++++++++++++++
sysdeps/i386/fpu/e_exp10.S | 34 +++++++++-
sysdeps/i386/fpu/e_exp10f.S | 34 +++++++++-
6 files changed, 249 insertions(+), 3 deletions(-)
--
You are receiving this mail because:
You are on the CC list for the bug.