Go to file
Joseph Myers b72592e75f Fix log10 (1) in round-downward mode (bug 16977).
As with various other issues of this kind, bug 16977 is log10 (1)
wrongly returning -0 rather than +0 in round-downward mode because of
an implementation effectively in terms of log1p (x - 1).  This patch
fixes the issue in the same way used for log.

Tested x86_64 and x86 and ulps updated accordingly.  Also tested for
mips64 to confirm a fix was needed for ldbl-128 and to validate that
fix (also applied to ldbl-128ibm since that version of logl is
essentially the same as the ldbl-128 one).

	[BZ #16977]
	* sysdeps/i386/fpu/e_log10.S (__ieee754_log10): Take absolute
	value when x - 1 is zero.
	* sysdeps/i386/fpu/e_log10f.S (__ieee754_log10f): Likewise.
	* sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Likewise.
	* sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Return
	0.0L for an argument of 1.0L.
	* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l):
	Likewise.
	* sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Take absolute
	value when x - 1 is zero.
	* math/libm-test.inc (log10_test): Use ALL_RM_TEST.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2014-05-23 12:07:50 +00:00
argp Fix __STRICT_ANSI__ -Wundef warnings 2014-03-17 16:05:23 +00:00
assert Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
benchtests Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
bits Fix -Wundef for _UTSNAME_DOMAIN_LENGTH. 2014-05-08 10:47:35 -07:00
catgets Count miscellaneous files built on host for testing as tests. 2014-03-07 03:31:41 +00:00
conf
conform conformtest: clean up POSIX expectations for stdlib.h, string.h. 2014-04-30 15:35:18 +00:00
crypt Fix formatting 2014-05-22 20:26:19 +05:30
csu Clean up __exit_thread. 2014-05-13 09:49:20 -07:00
ctype Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
debug tst-longjmp_chk2: add comments/sanity check 2014-03-13 17:05:29 -04:00
dirent Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
dlfcn Fix fallout from Joseph's untested Makeconfig change. 2014-02-28 13:00:27 -08:00
elf Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
gmon Don't use catomic functions in mcount (BZ #16912) 2014-05-06 16:30:48 +02:00
gnulib Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
grp Enumerate tests with special rules in tests-special variable. 2014-03-06 22:35:33 +00:00
gshadow Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
hesiod Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
hurd Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
iconv 2014-05-01 Steve Ellcey <sellcey@mips.com> 2014-05-01 10:22:35 -07:00
iconvdata Consistently use $(elf-objpfx). 2014-05-21 16:52:08 +00:00
include Clean up __exit_thread. 2014-05-13 09:49:20 -07:00
inet Return NULL for wildcard values in getnetgrent from nscd (BZ #16759) 2014-03-27 19:49:51 +05:30
intl Make tests consistently use *.out output files. 2014-03-07 03:29:23 +00:00
io Enumerate tests with special rules in tests-special variable. 2014-03-06 22:35:33 +00:00
libidn Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
libio Fix -Wundef warnings for _IO_JUMPS_OFFSET. 2014-05-01 13:33:13 -07:00
locale fix nl_langinfo with static linking (BZ #16915) 2014-05-20 18:43:14 +02:00
localedata Consistently use $(elf-objpfx). 2014-05-21 16:52:08 +00:00
login ptsname_r: don't leak uninitialized memory (BZ #16917) 2014-05-16 00:07:29 +02:00
mach Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
malloc Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
manual manual: Update prototypes for alphasort and friends 2014-05-23 11:26:06 +02:00
math Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
misc Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
nis Fix unbound stack use in NIS NSS module 2014-05-12 15:17:51 +02:00
nptl Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
nptl_db Enumerate tests with special rules in tests-special variable. 2014-03-06 22:35:33 +00:00
nscd Don't mention linuxthreads in Depend files. 2014-05-21 16:53:11 +00:00
nss Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
po Update Swedish translations 2014-05-16 14:21:12 +10:00
posix Use += before-compile instead of a :=. 2014-03-24 16:59:01 +01:00
pwd Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
resolv Don't mention linuxthreads in Depend files. 2014-05-21 16:53:11 +00:00
resource Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
rt Don't mention linuxthreads in Depend files. 2014-05-21 16:53:11 +00:00
scripts Kludge fix for Versions.def regression 2014-03-25 15:00:34 -07:00
setjmp Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
shadow Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
signal Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
socket Fix recvmmsg comment. 2014-04-28 18:16:07 +02:00
soft-fp Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
stdio-common Use existing makefile variables for dependencies on glibc libraries. 2014-05-16 21:38:08 +00:00
stdlib Fix strtold on 32-bit sparc (and probably others) (BZ #16965) 2014-05-20 18:44:28 +02:00
streams Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
string Fix v9/64-bit strcmp when string ends in multiple zero bytes. 2014-05-01 12:15:06 -07:00
sunrpc Fix fallout from Joseph's untested Makeconfig change. 2014-02-28 13:00:27 -08:00
sysdeps Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
sysvipc Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
termios Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
time Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
timezone Fix variable used in sed expression in timezone/Makefile 2014-05-16 13:58:31 +10:00
wcsmbs Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
wctype Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
.gitattributes
.gitignore ignore gdb related files 2013-12-27 16:30:50 -05:00
abi-tags
aclocal.m4 rename configure.in to configure.ac 2013-10-30 17:32:08 +10:00
BUGS
CANCEL-FCT-WAIVE
CANCEL-FILE-WAIVE
ChangeLog Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
ChangeLog.1
ChangeLog.2
ChangeLog.3
ChangeLog.4
ChangeLog.5
ChangeLog.6
ChangeLog.7
ChangeLog.8
ChangeLog.9
ChangeLog.10
ChangeLog.11
ChangeLog.12
ChangeLog.13
ChangeLog.14
ChangeLog.15
ChangeLog.16
ChangeLog.17
ChangeLog.old-ports Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-aarch64 Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-aix Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-alpha Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-am33 Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-arm Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-cris Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-hppa Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-ia64 Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-linux-generic Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-m68k Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-microblaze Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-mips Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-powerpc Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
ChangeLog.old-ports-tile Move ports/ChangeLog* files to ChangeLog.old-ports*, remove ports/ directory. 2014-04-30 10:40:29 -07:00
config.h.in Fix macro warning on HAVE_PT_CHOWN 2014-05-14 09:46:54 +02:00
config.make.in S/390: Port of lock elision to System/z 2014-05-09 16:58:46 +02:00
configure S/390: Port of lock elision to System/z 2014-05-09 16:58:46 +02:00
configure.ac S/390: Port of lock elision to System/z 2014-05-09 16:58:46 +02:00
CONFORMANCE
COPYING Update to latest versions of GPL-2.0 and LGPL-2.1 2013-09-09 12:52:48 +10:00
COPYING.LIB Update to latest versions of GPL-2.0 and LGPL-2.1 2013-09-09 12:52:48 +10:00
cppflags-iterator.mk
extra-lib.mk Remove --disable-versioning. 2013-09-04 15:25:42 +00:00
extra-modules.mk
INSTALL Increase minimum Linux kernel version to 2.6.32. 2014-04-30 15:41:03 +00:00
libc-abis
LICENSES Expand LICENSES file. 2012-12-05 21:56:15 +00:00
Makeconfig Consistently use $(elf-objpfx). 2014-05-21 16:52:08 +00:00
Makefile Consistently use $(elf-objpfx). 2014-05-21 16:52:08 +00:00
Makefile.in Add target bench-clean 2013-04-16 14:07:21 +05:30
Makerules Consistently use $(elf-objpfx). 2014-05-21 16:52:08 +00:00
NAMESPACE
NEWS Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
o-iterator.mk
PROJECTS
README Increase minimum Linux kernel version to 2.6.32. 2014-04-30 15:41:03 +00:00
Rules Generate overall summary of test results. 2014-03-07 03:25:57 +00:00
shlib-versions PowerPC: Change powerpc64le start ABI to 2.17. 2014-02-04 09:49:08 -02:00
test-skeleton.c tests: unify fortification handler logic 2014-02-08 06:58:43 -05:00
version.h Open development for 2.20 2014-02-08 08:10:29 +10:00
WUR-REPORT

This directory contains the sources of the GNU C Library.
See the file "version.h" for what release version you have.

The GNU C Library is the standard system C library for all GNU systems,
and is an important part of what makes up a GNU system.  It provides the
system API for all programs written in C and C-compatible languages such
as C++ and Objective C; the runtime facilities of other programming
languages use the C library to access the underlying operating system.

In GNU/Linux systems, the C library works with the Linux kernel to
implement the operating system behavior seen by user applications.
In GNU/Hurd systems, it works with a microkernel and Hurd servers.

The GNU C Library implements much of the POSIX.1 functionality in the
GNU/Hurd system, using configurations i[4567]86-*-gnu.  The current
GNU/Hurd support requires out-of-tree patches that will eventually be
incorporated into an official GNU C Library release.

When working with Linux kernels, this version of the GNU C Library
requires Linux kernel version 2.6.32 or later.

Also note that the shared version of the libgcc_s library must be
installed for the pthread library to work correctly.

The GNU C Library supports these configurations for using Linux kernels:

	aarch64*-*-linux-gnu
	alpha*-*-linux-gnu
	arm-*-linux-gnueabi
	hppa-*-linux-gnu	Not currently functional without patches.
	i[4567]86-*-linux-gnu
	x86_64-*-linux-gnu	Can build either x86_64 or x32
	ia64-*-linux-gnu
	m68k-*-linux-gnu
	microblaze*-*-linux-gnu
	mips-*-linux-gnu
	mips64-*-linux-gnu
	powerpc-*-linux-gnu	Hardware or software floating point, BE only.
	powerpc64*-*-linux-gnu	Big-endian and little-endian.
	s390-*-linux-gnu
	s390x-*-linux-gnu
	sh[34]-*-linux-gnu
	sparc*-*-linux-gnu
	sparc64*-*-linux-gnu
	tilegx-*-linux-gnu
	tilepro-*-linux-gnu

The code for other CPU configurations supported by volunteers outside of
the core glibc maintenance effort is contained in the `ports' add-on,
located in the `ports' subdirectory of the source tree.

If you are interested in doing a port, please contact the glibc
maintainers; see http://www.gnu.org/software/libc/ for more
information.

See the file INSTALL to find out how to configure, build, and install
the GNU C Library.  You might also consider reading the WWW pages for
the C library at http://www.gnu.org/software/libc/.

The GNU C Library is (almost) completely documented by the Texinfo manual
found in the `manual/' subdirectory.  The manual is still being updated
and contains some known errors and omissions; we regret that we do not
have the resources to work on the manual as much as we would like.  For
corrections to the manual, please file a bug in the `manual' component,
following the bug-reporting instructions below.  Please be sure to check
the manual in the current development sources to see if your problem has
already been corrected.

Please see http://www.gnu.org/software/libc/bugs.html for bug reporting
information.  We are now using the Bugzilla system to track all bug reports.
This web page gives detailed information on how to report bugs properly.

The GNU C Library is free software.  See the file COPYING.LIB for copying
conditions, and LICENSES for notices about a few contributions that require
these additional notices to be distributed.  License copyright years may be
listed using range notation, e.g., 2000-2013, indicating that every year in
the range, inclusive, is a copyrightable year that would otherwise be listed
individually.