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Joseph Myers 8d3f9e85cf Add narrowing subtract functions. 
This patch adds the narrowing subtract functions from TS 18661-1 to
glibc's libm: fsub, fsubl, dsubl, f32subf64, f32subf32x, f32xsubf64
for all configurations; f32subf64x, f32subf128, f64subf64x,
f64subf128, f32xsubf64x, f32xsubf128, f64xsubf128 for configurations
with _Float64x and _Float128; __nldbl_dsubl for ldbl-opt.

The changes are essentially the same as for the narrowing add
functions, so the description of those generally applies to this patch
as well.

Tested for x86_64, x86, mips64 (all three ABIs, both hard and soft
float) and powerpc, and with build-many-glibcs.py.

	* math/Makefile (libm-narrow-fns): Add sub.
	(libm-test-funcs-narrow): Likewise.
	* math/Versions (GLIBC_2.28): Add narrowing subtract functions.
	* math/bits/mathcalls-narrow.h (sub): Use __MATHCALL_NARROW.
	* math/gen-auto-libm-tests.c (test_functions): Add sub.
	* math/math-narrow.h (CHECK_NARROW_SUB): New macro.
	(NARROW_SUB_ROUND_TO_ODD): Likewise.
	(NARROW_SUB_TRIVIAL): Likewise.
	* sysdeps/ieee754/float128/float128_private.h (__fsubl): New
	macro.
	(__dsubl): Likewise.
	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add fsub and
	dsub.
	(CFLAGS-nldbl-dsub.c): New variable.
	(CFLAGS-nldbl-fsub.c): Likewise.
	* sysdeps/ieee754/ldbl-opt/Versions (GLIBC_2.28): Add
	__nldbl_dsubl.
	* sysdeps/ieee754/ldbl-opt/nldbl-compat.h (__nldbl_dsubl): New
	prototype.
	* manual/arith.texi (Misc FP Arithmetic): Document fsub, fsubl,
	dsubl, fMsubfN, fMsubfNx, fMxsubfN and fMxsubfNx.
	* math/auto-libm-test-in: Add tests of sub.
	* math/auto-libm-test-out-narrow-sub: New generated file.
	* math/libm-test-narrow-sub.inc: New file.
	* sysdeps/i386/fpu/s_f32xsubf64.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_f32xsubf64.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_fsub.c: Likewise.
	* sysdeps/ieee754/float128/s_f32subf128.c: Likewise.
	* sysdeps/ieee754/float128/s_f64subf128.c: Likewise.
	* sysdeps/ieee754/float128/s_f64xsubf128.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_dsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_f64xsubf128.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_fsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_dsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_fsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_dsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_fsubl.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/nldbl-dsub.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/nldbl-fsub.c: Likewise.
	* sysdeps/ieee754/soft-fp/s_dsubl.c: Likewise.
	* sysdeps/ieee754/soft-fp/s_fsub.c: Likewise.
	* sysdeps/ieee754/soft-fp/s_fsubl.c: Likewise.
	* sysdeps/powerpc/fpu/libm-test-ulps: Update.
	* sysdeps/mach/hurd/i386/libm.abilist: Likewise.
	* 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/riscv/rv64/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/tilegx32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
 		2018-03-20 00:34:52 +00:00
..
bits Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
powerpc32 Add narrowing subtract functions. 2018-03-20 00:34:52 +00:00
powerpc64 Add narrowing subtract functions. 2018-03-20 00:34:52 +00:00
powerpc64le powerpc64le: Enable float128 2017-06-26 15:04:47 -03:00
sys linux/powerpc: sync sys/ptrace.h with Linux 4.15 [BZ #22433, #22807] 2018-02-26 13:46:31 +00:00
Implies NPTL is no longer an add-on! 2014-07-07 09:29:06 -07:00
Makefile Remove abi-*-options compiler flags 2017-08-28 17:16:53 +02:00
Versions Revert {send,sendm,recv,recvm}msg conformance changes 2016-06-10 11:58:16 -03:00
configure Move architecture cases out of sysdeps/unix/sysv/linux/configure.ac. 2014-06-24 20:53:03 +00:00
configure.ac Move architecture cases out of sysdeps/unix/sysv/linux/configure.ac. 2014-06-24 20:53:03 +00:00
dl-brk.S
…
dl-cache.h
…
dl-static.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-sysdep.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
elision-conf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
elision-conf.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
elision-lock.c powerpc: Fix TLE build for SPE (BZ #22926) 2018-03-07 17:39:44 -03:00
elision-timed.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
elision-trylock.c powerpc: Fix TLE build for SPE (BZ #22926) 2018-03-07 17:39:44 -03:00
elision-unlock.c powerpc: Fix TLE build for SPE (BZ #22926) 2018-03-07 17:39:44 -03:00
force-elision.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
get_clockfreq.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
get_timebase_freq.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getdents64.c
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getmsg.c
…
gettimeofday.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
htm.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
init-first.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ioctl.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ipc_priv.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
kernel-features.h Refactor Linux ARCH_FORK implementation 2018-03-07 17:39:40 -03:00
kernel_termios.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ldconfig.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ldd-rewrite.sed
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ldsodefs.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-start.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-start.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-vdso.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
lowlevellock.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
nldbl-abi.h
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not-errno.h powerpc: Fix syscalls during early process initialization [BZ #22685] 2018-01-19 09:50:09 -02:00
profil-counter.h
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pt-longjmp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pthread_attr_setstack.c PowerPC: Move remaining nptl/sysdeps/unix/sysv/linux/powerpc/ files. 2014-05-26 11:45:14 -05:00
pthread_attr_setstacksize.c PowerPC: Move remaining nptl/sysdeps/unix/sysv/linux/powerpc/ files. 2014-05-26 11:45:14 -05:00
pthread_mutex_cond_lock.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pthread_mutex_lock.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pthread_mutex_timedlock.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pthread_mutex_trylock.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
putmsg.c
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readdir64.c
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readdir64_r.c
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readelflib.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rt-sysdep.c
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sigcontextinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syscall.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sysconf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sysdep.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-gettimebasefreq.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-powerpc-linux-sysconf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
time.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00