glibc/manual
Joseph Myers 5146356f5a Add fesetexcept.
TS 18661-1 defines an fesetexcept function for setting floating-point
exception flags without the side-effect of causing enabled traps to be
taken.

This patch series implements this function for glibc.  The present
patch adds the fallback stub implementation, x86 and x86_64
implementations, documentation, tests and ABI baseline updates.  The
remaining patches, some of them untested, add implementations for
other architectures.  The implementations generally follow those of
the fesetexceptflag function.

As for fesetexceptflag, the approach taken for architectures where
setting flags causes enabled traps to be taken is to set the flags
(and potentially cause traps) rather than refusing to set the flags
and returning an error.  Since ISO C and TS 18661 provide no way to
enable traps, this is formally in accordance with the standards.

The NEWS entry should be considered a placeholder, since this patch
series is intended to be followed by further such series adding other
TS 18661-1 features, so that the NEWS entry would end up looking more
like

* New <fenv.h> features from TS 18661-1:2014 are added to libm: the
  fesetexcept, fetestexceptflag, fegetmode and fesetmode functions,
  the femode_t type and the FE_DFL_MODE macro.

with hopefully more such entries for other features, rather than
having an entry for a single function in the end.

I believe we have consensus for adding TS 18661-1 interfaces as per
<https://sourceware.org/ml/libc-alpha/2016-06/msg00421.html>.

Tested for x86_64, x86, mips64 (hard float, and soft float to test the
fallback version), arm (hard float) and powerpc (hard float, soft
float and e500).

	* math/fesetexcept.c: New file.
	* sysdeps/i386/fpu/fesetexcept.c: Likewise.
	* sysdeps/x86_64/fpu/fesetexcept.c: Likewise.
	* math/fenv.h: Define
	__GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include
	<bits/libc-header-start.h> instead of including <features.h>.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (fesetexcept): New function
	declaration.
	* manual/arith.texi (fesetexcept): Document function.
	* math/Versions (fesetexcept): New libm symbol at version
	GLIBC_2.25.
	* math/Makefile (libm-support): Add fesetexcept.
	(tests): Add test-fesetexcept and test-fesetexcept-traps.
	* math/test-fesetexcept.c: New file.
	* math/test-fesetexcept-traps.c: Likewise.
	* sysdeps/nacl/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
2016-08-16 16:16:10 +00:00
..
examples glob: Simplify the interface for the GLOB_ALTDIRFUNC callback gl_readdir 2016-04-29 09:35:30 +02:00
argp.texi manual/argp.texi (Specifying Argp Parsers): Fix typo. 2015-10-14 11:49:58 -04:00
arith.texi Add fesetexcept. 2016-08-16 16:16:10 +00:00
charset.texi manual: fix typos in character set handling 2016-06-16 00:45:37 -04:00
check-safety.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
conf.texi * manual/conf.texi: Document MTASC-safety properties. 2014-01-29 05:26:47 -02:00
contrib.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
creature.texi Support __STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro. 2016-08-03 22:21:37 +00:00
crypt.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
ctype.texi manual: fix typos in the character handling chapter 2016-06-16 00:37:44 -04:00
debug.texi * manual/debug.texi: Document MTASC-safety properties. 2014-01-30 18:50:57 -02:00
dir .. 2005-11-21 15:45:19 +00:00
errno.texi manual: fix typos in error reporting 2016-05-19 23:25:06 -04:00
fdl-1.3.texi BZ#13738: Switch manual to FDL 1.3. 2012-02-24 12:58:10 -08:00
filesys.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
freemanuals.texi Update to canonical freemanuals.texi file. 2013-09-24 14:06:56 -07:00
getopt.texi * manual/getopt.texi: Document MTASC-safety properties. 2014-01-31 23:16:56 -02:00
header.texi Use Texinfo macros to refer to the GNU C Library within the manual. 2012-02-28 14:44:20 +00:00
install-plain.texi BZ #15941: Fix INSTALL file regeneration failure with makeinfo 5.x 2013-12-05 09:58:20 +05:30
install.texi 2016-06-05 Paul Pluzhnikov <ppluzhnikov@google.com> 2016-06-05 08:41:13 -07:00
intro.texi manual: fix typo in the introduction 2016-05-19 23:22:59 -04:00
io.texi Clean up glibc manual references to "GNU system" (bug 6911). 2012-03-08 01:27:38 +00:00
ipc.texi manual/ipc.texi: Fix AC-safety notes. 2014-04-08 17:12:15 -04:00
job.texi ctermid: return string literal, document MT-Safety pitfall 2014-11-21 02:16:02 -02:00
lang.texi Split large string section; add truncation advice 2015-12-10 08:29:30 -08:00
lgpl-2.1.texi Use canonical FSF .texi files for LGPL and FDL texts. 2011-06-06 16:16:55 -07:00
libc-texinfo.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
libc.texinfo Fix doc quoting problems with Texinfo 5 2016-01-10 00:20:51 -08:00
libcbook.texi
libdl.texi * manual/libdl.texi: New. 2014-01-31 23:23:59 -02:00
libm-err-tab.pl Add nextup and nextdown math functions 2016-06-16 21:37:45 +05:30
llio.texi Fix exponents in manual. 2015-08-20 09:43:50 +02:00
locale.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
macros.texi Fix exponents in manual. 2015-08-20 09:43:50 +02:00
maint.texi Fix two spaces after sentence. 2014-02-26 23:27:38 +01:00
Makefile Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
math.texi Support __STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro. 2016-08-03 22:21:37 +00:00
memory.texi manual: fix typos in the memory chapter 2016-06-16 00:33:53 -04:00
message.texi manual: fix typos in the message chapter 2016-06-16 01:14:32 -04:00
nss.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
nsswitch.texi
pattern.texi manual: fix typos in the pattern chapter 2016-06-16 01:34:38 -04:00
pipe.texi * manual/pipe.texi: Document MTASC-safety properties. 2014-01-31 23:37:28 -02:00
platform.texi PowerPC: Extend Program Priority Register support 2015-08-19 17:43:26 -03:00
probes.texi Fix two spaces after sentence. 2014-02-26 23:27:38 +01:00
process.texi Remove union wait [BZ #19613] 2016-04-14 08:54:57 +02:00
resource.texi Fix typo in manual. 2014-06-05 01:13:04 +02:00
search.texi manual: fix typos in the search chapter 2016-06-16 01:24:16 -04:00
setjmp.texi manual/setjmp.texi: Clarify setcontext and signal handlers text 2014-04-17 11:40:36 +01:00
signal.texi Fix crossreference to nonexistent node BSD Handler 2014-11-18 11:19:20 +01:00
socket.texi Fix two spaces after sentence. 2014-02-26 23:27:38 +01:00
startup.texi Remove _BSD_SOURCE and _SVID_SOURCE. 2014-02-11 23:40:07 +00:00
stdio-fp.c
stdio.texi Split large string section; add truncation advice 2015-12-10 08:29:30 -08:00
string.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
summary.awk Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysinfo.texi Make obsolete syscall wrappers into compat symbols (bug 18472). 2015-12-14 22:52:15 +00:00
syslog.texi * manual/syslog.texi: Document MTASC-safety properties. 2014-02-01 01:22:09 -02:00
terminal.texi * manual/terminal.texi: Document MTASC-safety properties. 2014-02-01 03:53:15 -02:00
texinfo.tex Update miscellaneous files from upstream sources. 2016-01-05 18:04:06 +00:00
texis.awk
threads.texi Remove CPU set size checking from affinity functions [BZ #19143] 2015-11-24 17:21:01 +01:00
time.texi * manual/time.texi (TZ Variable): glibc no longer comes with tzdata. 2015-02-16 15:32:34 -08:00
tsort.awk Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
users.texi manual: cuserid is mtasurace if not passed a string 2014-11-21 02:15:09 -02:00
xtract-typefun.awk Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00