mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 16:21:07 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
174 lines
5.7 KiB
ArmAsm
174 lines
5.7 KiB
ArmAsm
/* Determine the length of a string. For SPARC v9.
|
|
Copyright (C) 1998, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and
|
|
Jakub Jelinek <jj@ultra.linux.cz>.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include <asm/asi.h>
|
|
|
|
/* Normally, this uses
|
|
((xword - 0x0101010101010101) & 0x8080808080808080) test
|
|
to find out if any byte in xword could be zero. This is fast, but
|
|
also gives false alarm for any byte in range 0x81-0xff. It does
|
|
not matter for correctness, as if this test tells us there could
|
|
be some zero byte, we check it byte by byte, but if bytes with
|
|
high bits set are common in the strings, then this will give poor
|
|
performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
|
|
will use one tick slower, but more precise test
|
|
((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
|
|
which does not give any false alarms (but if some bits are set,
|
|
one cannot assume from it which bytes are zero and which are not).
|
|
It is yet to be measured, what is the correct default for glibc
|
|
in these days for an average user.
|
|
*/
|
|
|
|
.text
|
|
.align 32
|
|
ENTRY(strlen)
|
|
sethi %hi(0x01010101), %g1 /* IEU0 Group */
|
|
ldub [%o0], %o3 /* Load */
|
|
or %g1, %lo(0x01010101), %g1 /* IEU0 Group */
|
|
mov %o0, %o1 /* IEU1 */
|
|
|
|
sllx %g1, 32, %g4 /* IEU0 Group */
|
|
andcc %o0, 7, %g0 /* IEU1 */
|
|
or %g1, %g4, %g1 /* IEU0 Group */
|
|
brz,pn %o3, 13f /* CTI+IEU1 */
|
|
|
|
sllx %g1, 7, %g4 /* IEU0 Group */
|
|
bne,a,pn %icc, 15f /* CTI */
|
|
add %o0, 1, %o0 /* IEU1 */
|
|
/* %g1 = 0x0101010101010101 *
|
|
* %g4 = 0x8080808080808080 *
|
|
* %o0 = string pointer *
|
|
* %o1 = start of string */
|
|
1: ldx [%o0], %o3 /* Load Group */
|
|
|
|
add %o0, 8, %o0 /* IEU1 */
|
|
2: sub %o3, %g1, %o2 /* IEU0 Group */
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o2, %o3, %o5 /* IEU0 Group */
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o5, %g4, %g0 /* IEU1 Group */
|
|
#else
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o2, %g4, %g0 /* IEU1 Group */
|
|
#endif
|
|
|
|
be,pt %xcc, 2b /* CTI */
|
|
add %o0, 8, %o0 /* IEU0 */
|
|
addcc %o2, %g1, %g5 /* IEU1 Group */
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
srlx %o5, 32, %o5 /* IEU0 */
|
|
|
|
3: andcc %o5, %g4, %g0 /* IEU1 Group */
|
|
#else
|
|
srlx %o2, 32, %o2 /* IEU0 */
|
|
|
|
3: andcc %o2, %g4, %g0 /* IEU1 Group */
|
|
#endif
|
|
be,pn %xcc, 4f /* CTI */
|
|
srlx %g5, 56, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
|
|
be,pn %icc, 12f /* CTI */
|
|
srlx %g5, 48, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 11f /* CTI */
|
|
|
|
srlx %g5, 40, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 10f /* CTI */
|
|
srlx %g5, 32, %o2 /* IEU0 */
|
|
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 9f /* CTI */
|
|
4: srlx %g5, 24, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
|
|
be,pn %icc, 8f /* CTI */
|
|
srlx %g5, 16, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 7f /* CTI */
|
|
|
|
srlx %g5, 8, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 6f /* CTI */
|
|
sub %o3, %g1, %o2 /* IEU0 */
|
|
|
|
andcc %g5, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 5f /* CTI */
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o2, %g4, %g0 /* IEU1 Group */
|
|
|
|
be,pt %xcc, 2b /* CTI */
|
|
add %o0, 8, %o0 /* IEU0 */
|
|
addcc %o2, %g1, %g5 /* IEU1 Group */
|
|
ba,pt %xcc, 3b /* CTI */
|
|
|
|
srlx %o2, 32, %o2 /* IEU0 */
|
|
5: add %o0, -9, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
|
|
6: add %o0, -10, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
7: add %o0, -11, %o0 /* IEU0 Group */
|
|
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
8: add %o0, -12, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
9: add %o0, -13, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
|
|
10: add %o0, -14, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
11: add %o0, -15, %o0 /* IEU0 Group */
|
|
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
12: add %o0, -16, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
13: retl /* CTI+IEU1 Group */
|
|
mov 0, %o0 /* IEU0 */
|
|
nop
|
|
|
|
15: ldub [%o0], %o3 /* Load Group */
|
|
16: andcc %o0, 7, %g0 /* IEU1 */
|
|
be,pn %icc, 1b /* CTI */
|
|
nop /* IEU0 Group */
|
|
|
|
add %o0, 1, %o0 /* IEU1 */
|
|
andcc %o3, 0xff, %g0 /* IEU1 Group */
|
|
bne,a,pt %icc, 16b /* CTI */
|
|
lduba [%o0] ASI_PNF, %o3 /* Load */
|
|
|
|
add %o0, -1, %o0 /* IEU0 Group */
|
|
retl /* CTI+IEU1 Group */
|
|
sub %o0, %o1, %o0 /* IEU0 */
|
|
END(strlen)
|