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glibc/sysdeps/unix/sysv/linux/mips
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Joseph Myers 41c67149b9 Add roundeven, roundevenf, roundevenl. 
TS 18661-1 defines roundeven functions that round a floating-point
number to the nearest integer, in that floating-point type, with ties
rounding to even (whereas the round functions round ties away from
zero).  As with other such functions, they raise no exceptions apart
from "invalid" for signaling NaNs.  There was a previous user request
for this functionality in glibc in
<https://sourceware.org/ml/libc-help/2015-02/msg00005.html>.

This patch implements these functions for glibc.  The implementations
use integer bit-manipulation (or roundeven on the high and low parts,
in the IBM long double case).  It's possible that there may be faster
approaches on some architectures (in particular, on AArch64 the frintn
instruction should do exactly what's required); I'll leave it to
architecture maintainers or others interested to implement such
architecture-specific versions if desired.  (Where architectures have
instructions to round to nearest integer in the current rounding mode,
implementations saving and restoring the rounding mode - and dealing
with exceptions if those instructions generate "inexact" - are also
possible, though their performance depends on the cost of manipulating
exceptions / rounding mode state.)

Tested for x86_64, x86, mips64 and powerpc.

	* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(roundeven): New declaration.
	* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (roundeven): New
	macro.
	* math/Versions (roundeven): New libm symbol at version
	GLIBC_2.25.
	(roundevenf): Likewise.
	(roundevenl): Likewise.
	* math/Makefile (libm-calls): Add s_roundevenF.
	* math/libm-test.inc (roundeven_test_data): New array.
	(roundeven_test): New function.
	(main): Call roundeven_test.
	* math/test-tgmath.c (NCALLS): Increase to 134.
	(F(compile_test)): Call roundeven.
	(F(roundeven)): New function.
	* manual/arith.texi (Rounding Functions): Document roundeven,
	roundevenf and roundevenl.
	* manual/libm-err-tab.pl (@all_functions): Add roundeven.
	* include/math.h (roundeven): Use libm_hidden_proto.
	* sysdeps/ieee754/dbl-64/s_roundeven.c: New file.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c: Likewise.
	* sysdeps/ieee754/flt-32/s_roundevenf.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
	roundeven.
	(CFLAGS-nldbl-roundeven.c): New variable.
	* sysdeps/ieee754/ldbl-opt/nldbl-roundeven.c: New file.
	* 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.
2016-12-21 01:48:27 +00:00
..
bits Installed-header hygiene (BZ#20366): stack_t. 2016-09-23 08:43:56 -04:00
mips32 Add roundeven, roundevenf, roundevenl. 2016-12-21 01:48:27 +00:00
mips64 Add roundeven, roundevenf, roundevenl. 2016-12-21 01:48:27 +00:00
sys Make MIPS <sys/user.h> self-contained. 2016-11-04 16:44:23 +00:00
____longjmp_chk.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
_test_and_set.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
arch-fork.h Split arch-fork.h from fork.h 2014-05-16 11:17:41 -07:00
brk.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
clone.S Remove cached PID/TID in clone 2016-11-24 19:38:51 -02:00
configure MIPS: Set the required Linux kernel version to 4.5.0 for 2008 NaN 2016-01-25 00:19:27 +00:00
configure.ac MIPS: Set the required Linux kernel version to 4.5.0 for 2008 NaN 2016-01-25 00:19:27 +00:00
dl-cache.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-static.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getmsg.c Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
getrlimit64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getsysstats.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Implies NPTL is no longer an add-on! 2014-07-07 09:29:06 -07:00
init-first.c VDSO support for MIPS 2016-04-12 11:05:13 +01:00
ipc_priv.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
kernel-features.h Remove __ASSUME_OFF_DIFF_OFF64 definition 2016-07-08 14:28:08 -03:00
kernel_rt_sigframe.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
kernel_sigaction.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
kernel_stat.h Allow [f]statfs64 to alias [f]statfs 2016-11-22 09:59:12 -08:00
kernel_termios.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ldsodefs.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
libc-abis Add support for MIPS O32 FPXX and .MIPS.abiflags 2014-12-31 21:09:21 +00:00
libc-vdso.h VDSO support for MIPS 2016-04-12 11:05:13 +01:00
makecontext.S mips: terminate the FDE before the return trampoline in makecontext 2016-03-09 18:48:18 +01:00
Makefile XFAIL check-execstack for MIPS. 2016-11-04 16:42:37 +00:00
pipe.S Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
profil-counter.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
pt-vfork.S MIPS: Consolidate NPTL/non versions of vfork 2014-06-27 11:18:10 -07:00
putmsg.c Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
readelflib.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
register-dump.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setrlimit64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shlib-versions Remove configuration name patterns from shlib-versions. 2014-09-12 12:28:47 +00:00
sigaction.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
swapcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscalls.list Adjust kernel-features.h defaults for recvmsg and sendmsg 2016-05-25 17:27:57 -03:00
sysdep-cancel.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ucontext_i.sym Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
ustat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Versions VDSO support for MIPS 2016-04-12 11:05:13 +01:00
vfork.S Remove cached PID/TID in clone 2016-11-24 19:38:51 -02:00
xstatconv.c Always define XSTAT_IS_XSTAT64 2016-11-21 08:23:12 -08:00