update from main archive 961105 cvs/libc-961106

Wed Nov  6 04:30:26 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/syscalls.list: Add weak alias llseek for
	_llseek syscall.  Reported by Andy Sewell <puck@pookhill.demon.co.uk>.

	* string/argz.h: Don't protect by __USE_GNU.

Tue Nov  5 23:38:28 1996  Ulrich Drepper  <drepper@cygnus.com>

	* Lots of files: Update and reformat copyright.

	* Makefile (headers): Add xopen_lim.h.

	* catgets/nl_types.h: Move __BEGIN_DECLS before definition of nl_catd.

	* grp/grp.h: Define setgrent, getgrent, endgrent, and getgrent_r
	if __USE_XOPEN_EXTENDED is defined.
	* pwd/pwd.h: Define setpwent, getpwent, endpwent, and getpwent_r
	if __USE_XOPEN_EXTENDED is defined.

	* io/Makefile (routines): Add lchown.

	* io/sys/poll.h: Add definition of POLLWRNORM.

	* io/sys/stat.h: Declare lstat, fchmod, mknod when
	__USE_XOPEN_EXTENDED is defined.

	* libio/Makefile (routines): Add obprintf.
	* libio/obprintf.c: New file.
	* libio/iolibio.h: Add prototypes for _IO_obstack_vprintf and
	_IO_obstack_printf.
	* libio/libio.h: Fix typo.
	* libio/stdio.h: Declare tempnam if __USE_XOPEN_EXTENDED is defined.
	Add prototypes for obstack_vprintf and obstack_printf.

	* manual/creature.texi: Describe _XOPEN_SOURCE macro.
	* manual/intro.texi: Add reference to NSS chapter.
	* manual/libc.texinfo: Update UPDATED.
	Comment out `@printindex cp'.  It works again.
	* manual/memory.texi: Add description for obstack_ptr_grow,
	obstack_int_grow, obstack_ptr_grow_fast, and obstack_int_grow_fast.
	* manual/nss.texi: Add a few @cindex entries and change NSS_STATUS_*
	index entries to @vindex.
	* manual/users.texi: Correct @cindex entry for Netgroup.

	* math/mathcalls.h: Use __USE_XOPEN and __USE_XOPEN_EXTENDED to
	make declarations visible for X/Open sources.

	* misc/search.h: Declare insque/remque only is __USE_SVID or
	__USE_XOPEN_EXTENDED is defined.

	* misc/sys/uio.h (readv, writev): Change return value from int to
	ssize_t.

	* posix/Makefile (headers): Add re_comp.h.
	* posix/re_comp.h: New file.  XPG interface to regex functions.

	* posix/getconf.c: Add all names from XPG4.2.
	* posix/posix1_lim.h: Increase minimum values for _POSIX_CHILD_MAX
	and _POSIX_OPEN_MAX to minimums from XPG4.2.
	* sysdeps/generic/confname.h: Add all _SC_* names from XPG4.2.
	* sysdeps/posix/sysconf.c: Handle new _SC_* values.
	* sysdeps/stub/sysconf.c: Likewise.

	* posix/unistd.h: Add declaration of ualarm and lchown.  Declare
	usleep, fchown, fchdir, nice, getpgid, setsid, getsid, setreuid,
	setregid, vfork, ttyslot, symlink, readlink, gethostid, truncate,
	ftruncate, getdtablesize, brk, sbrk, lockf when
	__USE_XOPEN_EXTENDED is defined.

	* posix/sys/wait.h: Declare wait3 if __USE_XOPEN_EXTENDED is defined.

	* shadow/shadow.h: Define SHADOW using _PATH_SHADOW.
	* sysdeps/generic/paths.h: Define _PATH_SHADOW.
	* sysdeps/unix/sysv/linux/paths.h: Likewise.

	* signal/signal.h: Declare killpg, sigstack and sigaltstack when
	__USE_XOPEN_EXTENDED is defined.

	* stdio/stdio.h: Declare tempnam when __USE_XOPEN is defined.

	* stdlib/stdlib.h: Make rand48 functions available when __USE_XOPEN
	is defined.
	Likewise for valloc, putenv, realpath, [efg]cvt*, and getsubopt
	functions.

	* string/string.h: Make memccpy, strdup, bcmp, bcopy, bzero, index,
	and rindex available when __USE_XOPEN_EXTENDED is defined.

	* sysdeps/mach/getpagesize.c: De-ANSI-fy.  Change return type to int.
	* sysdeps/posix/getpagesize.c: Likewise.
	* sysdeps/stub/getpagesize.c: Likewise.
	* sysdeps/unix/getpagesize.c: Likewise.

	* time/africa: Update from tzdata1996l.
	* time/asia: Likewise.
	* time/australia: Likewise.
	* time/europe: Likewise.
	* time/northamerica: Likewise.
	* time/pacificnew: Likewise.
	* time/southamerica: Likewise.
	* time/tzfile.h: Update from tzcode1996m.

	* time/time.h: Declare strptime if __USE_XOPEN.
	Declare daylight and timezone also if __USE_XOPEN.

	* time/sys/time.h: Remove declaration of ualarm.

	* wctype/wctype.h: Just reference ISO C standard.

Tue Nov  5 01:26:32 1996  Richard Henderson  <rth@tamu.edu>

	* crypt/Makefile: Add crypt routines to libc as well iff
	$(crypt-in-libc) is set.  Do this for temporary binary compatibility
	on existing Linux/Alpha installations.

	* stdlib/div.c, sysdeps/generic/div.c: Move file to .../generic/.
	* stdlib/ldiv.c, sysdeps/generic/ldiv.c: Likewise.
	* stdlib/lldiv.c, sysdeps/generic/lldiv.c: Likewise.
	* sysdeps/alpha/Makefile (divrem): Add divlu, dviqu, remlu, and
	remqu.
	* sysdeps/alpha/div.S: New file.
	* sysdeps/alpha/ldiv.S: New file.
	* sysdeps/alpha/lldiv.S: New file.
	* sysdeps/alpha/divrem.h: Merge signed and unsigned division.
	Take pointers from Linus and tighten the inner loops a bit.
	* sysdeps/alpha/divl.S: Change defines for merged routines.
	* sysdeps/alpha/divq.S: Likewise.
	* sysdeps/alpha/reml.S: Likewise.
	* sysdeps/alpha/remq.S: Likewise.
	* sysdeps/alpha/divlu.S: Remove file.
	* sysdeps/alpha/divqu.S: Likewise.
	* sysdeps/alpha/remlu.S: Likewise.
	* sysdeps/alpha/remqu.S: Likewise.

	* sysdeps/alpha/bsd-_setjmp.S: If PROF, call _mcount.
	* sysdeps/alpha/bsd-setjmp.S: Likewise.
	* sysdeps/alpha/bzero.S: Likewise.
	* sysdeps/alpha/ffs.S: Likewise.
	* sysdeps/alpha/htonl.S: Likewise.
	* sysdeps/alpha/htons.S: Likewise.
	* sysdeps/alpha/memchr.S: Likewise.
	* sysdeps/alpha/memset.S: Likewise.
	* sysdeps/alpha/s_copysign.S: Likewise.
	* sysdeps/alpha/s_fabs.S: Likewise.
	* sysdeps/alpha/setjmp.S: Likewise.
	* sysdeps/alpha/stpcpy.S: Likewise.
	* sysdeps/alpha/stpncpy.S: Likewise.
	* sysdeps/alpha/strcat.S: Likewise.
	* sysdeps/alpha/strchr.S: Likewise.
	* sysdeps/alpha/strcpy.S: Likewise.
	* sysdeps/alpha/strlen.S: Likewise.
	* sysdeps/alpha/strncat.S: Likewise.
	* sysdeps/alpha/strncpy.S: Likewise.
	* sysdeps/alpha/strrchr.S: Likewise.
	* sysdeps/alpha/udiv_qrnnd.S: Likewise.  Fix private labels.
	Convert two small jumps to use conditional moves.
	* sysdeps/unix/alpha/sysdep.h: Compress all __STDC__ nastiness.
	(PSEUDO): If PROF, call _mcount.
	* sysdeps/unix/sysv/linux/alpha/brk.S: If PROF, call _mcount.
	* sysdeps/unix/sysv/linux/alpha/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/llseek.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/syscall.S: Likewise.

	* sysdeps/alpha/memcpy.S: New file.  Odd layout because it should
	eventually contain memmove as well.
	* sysdeps/alpha/strcmp.S: New file.
	* sysdeps/alpha/strncmp.S: New file.
	* sysdeps/alpha/w_sqrt.S: New file.

Tue Nov  5 18:06:06 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/mach/hurd/ttyname_r.c: Use `size_t' for len variable.

Tue Nov  5 12:09:29 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdep/generic/sysdep.h: Define END only if not yet defined.
	* sysdep/unix/sysdep.h: Define PSEUDO_END only if not yet defined.
	Reported by Thomas Bushnell, n/BSG.

Mon Nov  4 22:46:53 1996  Ulrich Drepper  <drepper@cygnus.com>

	* manual/users.texi (Netgroup Data): Remove { } around @cindex.

Mon Nov  4 19:07:05 1996  Ulrich Drepper  <drepper@cygnus.com>

	* malloc/calloc.c: Check for overflow before trying to allocate
	memory.  Proposed by Neil Matthews <nm@adv.sbc.sony.co.jp>.

Fri Nov  1 18:18:32 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/llio.texi (Operating Modes): Add missing arguments to
	@deftypevr in O_NONBLOCK description.

	* manual/time.texi (Time Zone Functions): Enclose type name in
	braces in description of tzname.  FIXME: this does not yet work
	correctly in info.

Sun Nov  3 17:29:06 1996  Ulrich Drepper  <drepper@cygnus.com>

	* features.h: Add X/Open macros.
	* posix/unistd.h: Define X/Open macros.
	* sysdeps/generic/confname.h: Add _SC_XOPEN_XCU_VERSION,
	_SC_XOPEN_UNIX, _SC_XOPEN_CRYPT, _SC_XOPEN_ENH_I18N,
	_SC_XOPEN_SHM, _SC_2_CHAR_TERM, _SC_2_C_VERSION, and _SC_2_UPE.
	* sysdeps/posix/sysconf.c: Handle new constants.
	* sysdeps/stub/sysconf.c: Likewise.
	* sysdeps/unix/sysv/linux/posix_opt.h: Add definition of _XOPEN_SHM.

	* catgets/catgets.c (catopen): Set errno to ENOMEM when
	we run out of memory.
	(catgets): Set errno to EBADF when catalog handle is invalid.
	Set errno to ENOMSG when translation is not available.
	(catclose): Set errno to EBADF when catalog handle is invalid.

	* ctype/ctype.h: Declare isascii and toascii when __USE_XOPEN.
	Likewise for _toupper and _tolower.

	* manual/arith.texi: Document strtoq, strtoll, strtouq, strtoull,
	strtof, and strtold.
	* manual/math.texi: Document HUGE_VALf and HUGE_VALl.
	* manual/stdio.h: Document ' flag for numeric formats of scanf.
	* manual/users.texi: Document that cuserid shouldn't be used.

	* misc/Makefile (routines): Add dirname.
	(headers): Add libgen.h.
	(tests): Add tst-dirname.
	* misc/dirname.c: New file.
	* misc/libgen.h: New file.
	* misc/tst-dirname.c: New file.

	* misc/search.h: Parameter of hcreate must be of type size_t.
	* misc/hsearch.c: Likewise.
	* misc/hsearch_r.c: Likewise for hcreate_r.
	* misc/search.h: Parameters of insque and remque must be `void *'.
	* misc/insremque.c: Likewise.

	* posix/unistd.h: Move declarations of mktemp and mkstemp to...
	* stdlib/stdlib.h: ...here.
	* posix/unistd.h [__USE_XOPEN]: Add prototypes for crypt, setkey,
	encrypt, and swab.

	* stdio-common/printf-parse.h (struct printf_spec): Add pa_wchar
	and pa_wstring.
	(parse_one_spec): Remove Linux compatibility code.
	Recognize %C and %S formats.
	* stdio-common/printf.h: Add PA_WCHAR and PA_WSTRING.
	* stdio-common/vfprintf.c: Add implementation of %C and %S format.
	* stdio-common/vfscanf.c: Likewise for scanf.

	* stdlib/l64a.c: Return value for 0 must be the empty string.
	* stdlib/stdlib.h: Declare reentrant function from rand49 family
	only if __USE_REENTRANT.
	Declare rand48 functions also if __USE_XOPEN.

	* stdlib/strtol.c: Return 0 and set errno to EINVAL when BASE is
	not a legal value.
	Return 0 and set errno to EINVAL when strou* sees negativ number.
	* stdlib/tst-strtol.c: De-ANSI-fy.
	Change expected results for test of unsigned function and negative
	input.

	* string/stratcliff.c: Prevent warnings.
	* string.h: Move declaration of swab to <unistd.h>.
	* string/swab.c: De-ANSI-fy.

	* sysdeps/posix/cuserid.c: Implement using getpwuid_r.
	* sysdeps/posix/mkstemp.c: Include <stdlib.h> for prototype.
	* sysdeps/posix/mktemp.c: Likewise.
	* sysdeps/stub/mkstemp.c: Likewise.
	* sysdeps/stub/mktemp.c: Likewise.

	* sysvipc/sys/ipc.h: Prototypes of ftok have to be of types `const
 	char *' and `int'.
	* sysvipc/ftok.c: Likewise.  Make sure only lower 8 bits of
 	PROJ_ID are used.

Sun Nov  3 03:21:28 1996  Heiko Schroeder  <Heiko.Schroeder@post.rwth-aachen.de>

	* locale/programs/ld-numeric.c (numeric_output): Compute idx[0]
	correctly.

Sat Nov  2 17:44:32 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/posix/cuserid.c: Use reentrant functions.
	* manual/users.texi: Tell that cuserid is marked to be withdrawn in
	XPG4.2.

Sat Nov  2 14:26:37 1996  Ulrich Drepper  <drepper@cygnus.com>

	Linus said he will make sure no system call will return a value
	in -1 ... -4095 as a valid result.
	* sysdeps/unix/sysv/linux/i386/sysdep.h: Correct test for error.
	* sysdeps/unix/sysv/linux/i386/syscall.S: Likewise.
	* sysdeps/unix/sysv/linux/m68k/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/m68k/syscall.S: Likewise.

Sat Nov  2 16:54:49 1996  NIIBE Yutaka  <gniibe@mri.co.jp>

	* sysdeps/stub/lockfile.c [!USE_IN_LIBIO]: Define weak alias for
	__funlockfile, not a circular alias.
	Define __IO_ftrylockfile if USE_IN_LIBIO and __ftrylockfile if not,
	not vice versa.

	* sysdeps/unix/sysv/linux/i386/sysdep.S (__errno_location): Make
	it a weak symbol.
	* sysdeps/unix/sysv/linux/m68k/sysdep.S (__errno_location): Likewise.


	Likewise.

	* crypt/Makefile (rpath-link): Extend search path to current directory.

1 files changed, 224 insertions, 0 deletions

diff --git a/sysdeps/alpha/strncmp.S b/sysdeps/alpha/strncmp.S
new file mode 100644
index 0000000000..682759042f
--- /dev/null
+++ b/sysdeps/alpha/strncmp.S
@@ -0,0 +1,224 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+   Contributed by Richard Henderson (rth@tamu.edu)
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+   Cambridge, MA 02139, USA.  */
+
+/* Bytewise compare two null-terminated strings of length no longer than N.  */
+
+#include <sysdep.h>
+
+	.set noat
+	.set noreorder
+
+	.text
+
+ENTRY(strncmp)
+#ifdef PROF
+	ldgp	gp, 0(pv)
+	lda	AT, _mcount
+	jsr	AT, (AT), _mcount
+	.prologue 1
+#else
+	.prologue 0
+#endif
+
+	xor	a0, a1, t2	# e0    : are s1 and s2 co-aligned?
+	beq	a2, $zerolength	# .. e1 :
+	ldq_u	t0, 0(a0)	# e0    : give cache time to catch up
+	ldq_u	t1, 0(a1)	# .. e1 :
+	and	t2, 7, t2	# e0    :
+	and	a0, 7, t4	# .. e1 : find s1 misalignment
+	lda	t3, -1		# e0    :
+	addq	a2, t4, a2	# .. e1 : bias count by s1 misalignment
+	and	a2, 7, t10	# e1    : ofs of last byte in last word
+	srl	a2, 3, a2	# .. e0 : remaining full words in count
+	and	a1, 7, t5	# e0    : find s2 misalignment
+	bne	t2, $unaligned	# .. e1 :
+
+	/* On entry to this basic block:
+	   t0 == the first word of s1.
+	   t1 == the first word of s2.
+	   t3 == -1.  */
+
+$aligned:
+	mskqh	t3, a1, t3	# e0    : mask off leading garbage
+	nop			# .. e1 :
+	ornot	t1, t3, t1	# e0    :
+	ornot	t0, t3, t0	# .. e1 :
+	cmpbge	zero, t1, t7	# e0    : bits set iff null found
+	beq	a2, $eoc	# .. e1 : check end of count
+	unop			#       :
+	bne	t7, $eos	# e1    :
+
+	/* Aligned compare main loop.
+	   On entry to this basic block:
+	   t0 == an s1 word.
+	   t1 == an s2 word not containing a null.  */
+
+$a_loop:
+	xor	t0, t1, t2	# e0	:
+	bne	t2, $wordcmp	# .. e1 (zdb)
+	ldq_u	t1, 0(a1)	# e0    :
+	ldq_u	t0, 0(a0)	# .. e1 :
+	addq	a1, 8, a1	# e0    :
+	addq	a0, 8, a0	# .. e1 :
+	cmpbge	zero, t1, t7	# e0    :
+	beq	a2, $eoc	# .. e1 :
+	subq	a2, 1, a2	# e0    :
+	beq	t7, $a_loop	# .. e1 :
+	br	$eos		# e1    :
+
+	/* The two strings are not co-aligned.  Align s1 and cope.  */
+$unaligned:
+	subq	a1, t4, a1	# e0	 :
+	unop			#        :
+
+	/* If s2 misalignment is larger than s2 misalignment, we need
+	   extra startup checks to avoid SEGV.  */
+
+	cmplt	t4, t5, t8	# .. e1 :
+	beq	t8, $u_head	# e1    :
+
+	mskqh	t3, t5, t3	# e0    :
+	ornot	t1, t3, t3	# e0    :
+	cmpbge	zero, t3, t7	# e1    : is there a zero?
+	beq	t7, $u_head	# e1    :
+
+	/* We've found a zero in the first partial word of s2.  Align
+	   our current s1 and s2 words and compare what we've got.  */
+
+	extql	t1, t5, t1	# e0    :
+	lda	t3, -1		# .. e1 :
+	insql	t1, a0, t1	# e0    :
+	mskqh	t3, a0, t3	# e0    :
+	ornot	t1, t3, t1	# e0    :
+	ornot	t0, t3, t0	# .. e1 :
+	cmpbge	zero, t1, t7	# e0    : find that zero again
+	beq	a2, $eoc	# .. e1 : and finish up
+	br	$eos		# e1    :
+
+	.align 3
+$u_head:
+	/* We know just enough now to be able to assemble the first
+	   full word of s2.  We can still find a zero at the end of it.
+
+	   On entry to this basic block:
+	   t0 == first word of s1
+	   t1 == first partial word of s2.  */
+
+	ldq_u	t2, 8(a1)	# e0    : load second partial s2 word
+	lda	t3, -1		# .. e1 : create leading garbage mask
+	extql	t1, a1, t1	# e0    : create first s2 word
+	mskqh	t3, a0, t3	# e0    :
+	extqh	t2, a1, t4	# e0    :
+	ornot	t0, t3, t0	# .. e1 : kill s1 garbage
+	or	t1, t4, t1	# e0    : s2 word now complete
+	ornot	t1, t3, t1	# e1    : kill s2 garbage
+	cmpbge	zero, t0, t7	# e0    : find zero in first s1 word
+	beq	a2, $eoc	# .. e1 :
+	lda	t3, -1		# e0    :
+	bne	t7, $eos	# .. e1 :
+	subq	a2, 1, a2	# e0    :
+	xor	t0, t1, t4	# .. e1 : compare aligned words
+	mskql	t3, a1, t3	# e0    : mask out s2[1] bits we have seen
+	bne	t4, $wordcmp	# .. e1 :
+	or	t2, t3, t3	# e0    :
+	cmpbge	zero, t3, t7	# e1    : find zero in high bits of s2[1]
+	bne	t7, $u_final	# e1    :
+
+	/* Unaligned copy main loop.  In order to avoid reading too much,
+	   the loop is structured to detect zeros in aligned words from s2.
+	   This has, unfortunately, effectively pulled half of a loop
+	   iteration out into the head and half into the tail, but it does
+	   prevent nastiness from accumulating in the very thing we want
+	   to run as fast as possible.
+
+	   On entry to this basic block:
+	   t2 == the unshifted low-bits from the next s2 word.  */
+
+	.align 3
+$u_loop:
+	extql	t2, a1, t3	# e0    :
+	ldq_u	t2, 16(a1)	# .. e1 : load next s2 high bits
+	ldq_u	t0, 8(a0)	# e0    : load next s1 word
+	addq	a1, 8, a1	# .. e1 :
+	addq	a0, 8, a0	# e0    :
+	nop			# .. e1 :
+	extqh	t2, a1, t1	# e0    :
+	cmpbge	zero, t0, t7	# .. e1 : find zero in current s1 word
+	or	t1, t3, t1	# e0    :
+	beq	a2, $eoc	# .. e1 : check for end of count
+	subq	a2, 1, a2	# e0    :
+	bne	t7, $eos	# .. e1 :
+	xor	t0, t1, t4	# e0    : compare the words
+	bne	t4, $wordcmp	# .. e1 (zdb)
+	cmpbge	zero, t2, t4	# e0    : find zero in next low bits
+	beq	t4, $u_loop	# .. e1 (zdb)
+
+	/* We've found a zero in the low bits of the last s2 word.  Get
+	   the next s1 word and align them.  */
+$u_final:
+	ldq_u	t0, 8(a0)	# e1    :
+	extql	t2, a1, t1	# .. e0 :
+	cmpbge	zero, t1, t7	# e0    :
+	bne	a2, $eos	# .. e1 :
+
+	/* We've hit end of count.  Zero everything after the count
+	   and compare whats left.  */
+
+	.align 3
+$eoc:
+	mskql	t0, t10, t0
+	mskql	t1, t10, t1
+
+	/* We've found a zero somewhere in a word we just read.
+	   On entry to this basic block:
+	   t0 == s1 word
+	   t1 == s2 word
+	   t7 == cmpbge mask containing the zero.  */
+
+$eos:
+	negq	t7, t6		# e0    : create bytemask of valid data
+	and	t6, t7, t8	# e1    :
+	subq	t8, 1, t6	# e0    :
+	or	t6, t8, t7	# e1    :
+	zapnot	t0, t7, t0	# e0    : kill the garbage
+	zapnot	t1, t7, t1	# .. e1 :
+	xor	t0, t1, v0	# e0    : and compare
+	beq	v0, $done	# .. e1 :
+
+	/* Here we have two differing co-aligned words in t0 & t1.
+           Bytewise compare them and return (t0 > t1 ? 1 : -1).  */
+$wordcmp:
+	cmpbge	t0, t1, t2	# e0    : comparison yields bit mask of ge
+	cmpbge	t1, t0, t3	# .. e1 :
+	xor	t2, t3, t0	# e0    : bits set iff t0/t1 bytes differ
+	negq	t0, t1		# e1    : clear all but least bit
+	and	t0, t1, t0	# e0    :
+	lda	v0, -1		# .. e1 :
+	and	t0, t2, t1	# e0    : was bit set in t0 > t1?
+	cmovne	t1, 1, v0	# .. e1 (zdb)
+
+$done:
+	ret			# e1    :
+
+$zerolength:
+	clr	v0
+	ret
+
+	END(strncmp)