1999-03-29 13:25:15 +00:00
|
|
|
/* Compare two strings for differences.
|
|
|
|
|
For SPARC v9.
|
|
|
|
|
Copyright (C) 1997, 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
|
2001-07-06 04:58:11 +00:00
|
|
|
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.
|
1999-03-29 13:25:15 +00:00
|
|
|
|
|
|
|
|
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
|
2001-07-06 04:58:11 +00:00
|
|
|
Lesser General Public License for more details.
|
1999-03-29 13:25:15 +00:00
|
|
|
|
2001-07-06 04:58:11 +00:00
|
|
|
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. */
|
1999-03-29 13:25:15 +00:00
|
|
|
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
#include <asm/asi.h>
|
1999-07-27 04:43:32 +00:00
|
|
|
#ifndef XCC
|
|
|
|
|
.register %g2, #scratch
|
|
|
|
|
.register %g3, #scratch
|
|
|
|
|
.register %g7, #scratch
|
|
|
|
|
#endif
|
1999-03-29 13:25:15 +00:00
|
|
|
|
|
|
|
|
/* 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(strcmp)
|
|
|
|
|
sethi %hi(0x01010101), %g1 /* IEU0 Group */
|
|
|
|
|
andcc %o0, 7, %g0 /* IEU1 */
|
|
|
|
|
bne,pn %icc, 7f /* CTI */
|
|
|
|
|
or %g1, %lo(0x01010101), %g1 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
andcc %o1, 7, %g3 /* IEU1 */
|
|
|
|
|
bne,pn %icc, 9f /* CTI */
|
|
|
|
|
sllx %g1, 32, %g2 /* IEU0 Group */
|
|
|
|
|
ldx [%o0], %o2 /* Load */
|
|
|
|
|
|
|
|
|
|
or %g1, %g2, %g1 /* IEU0 Group */
|
|
|
|
|
1: ldx [%o1], %o3 /* Load */
|
|
|
|
|
sub %o1, %o0, %o1 /* IEU1 */
|
|
|
|
|
sllx %g1, 7, %g2 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
2: add %o0, 8, %o0 /* IEU1 */
|
|
|
|
|
sub %o2, %g1, %g3 /* IEU0 Group */
|
|
|
|
|
subcc %o2, %o3, %g0 /* IEU1 */
|
|
|
|
|
bne,pn %xcc, 13f /* CTI */
|
|
|
|
|
|
|
|
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
|
|
|
andn %g3, %o2, %g4 /* IEU0 Group */
|
|
|
|
|
ldxa [%o0] ASI_PNF, %o2 /* Load */
|
|
|
|
|
andcc %g4, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
#else
|
|
|
|
|
ldxa [%o0] ASI_PNF, %o2 /* Load Group */
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 */
|
|
|
|
|
#endif
|
|
|
|
|
be,a,pt %xcc, 2b /* CTI */
|
|
|
|
|
ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load Group */
|
|
|
|
|
|
|
|
|
|
addcc %g3, %g1, %o4 /* IEU1 */
|
|
|
|
|
srlx %g3, 32, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
be,pt %xcc, 3f /* CTI */
|
|
|
|
|
|
|
|
|
|
srlx %o4, 56, %o5 /* IEU0 */
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
srlx %o4, 48, %o5 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
srlx %o4, 40, %o5 /* IEU0 */
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
srlx %o4, 32, %o5 /* IEU0 */
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
|
|
|
|
|
3: srlx %o4, 24, %o5 /* IEU0 */
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
srlx %o4, 16, %o5 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
srlx %o4, 8, %o5 /* IEU0 */
|
|
|
|
|
andcc %o5, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %icc, 4f /* CTI */
|
|
|
|
|
andcc %o4, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
bne,a,pn %icc, 2b /* CTI */
|
|
|
|
|
ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load */
|
|
|
|
|
|
|
|
|
|
4: retl /* CTI+IEU1 Group */
|
|
|
|
|
clr %o0 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
.align 32
|
|
|
|
|
13: mov 0xff, %g7 /* IEU0 Group */
|
|
|
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
|
|
|
andcc %g4, %g2, %g0 /* IEU1 */
|
|
|
|
|
#else
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 */
|
|
|
|
|
#endif
|
|
|
|
|
be,pt %xcc, 25f /* CTI */
|
|
|
|
|
addcc %g3, %g1, %o4 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
srlx %g3, 32, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
be,pt %xcc, 23f /* CTI */
|
|
|
|
|
sllx %g7, 56, %o5 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %xcc, 24f /* CTI */
|
|
|
|
|
sllx %g7, 48, %o5 /* IEU0 */
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %xcc, 24f /* CTI */
|
|
|
|
|
sllx %g7, 40, %o5 /* IEU0 */
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %xcc, 24f /* CTI */
|
|
|
|
|
|
|
|
|
|
sllx %g7, 32, %o5 /* IEU0 */
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %xcc, 24f /* CTI */
|
|
|
|
|
23: sllx %g7, 24, %o5 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 24f /* CTI */
|
|
|
|
|
sllx %g7, 16, %o5 /* IEU0 */
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %icc, 24f /* CTI */
|
|
|
|
|
sllx %g7, 8, %o5 /* IEU0 */
|
|
|
|
|
andcc %o4, %o5, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 24f /* CTI */
|
|
|
|
|
|
|
|
|
|
mov %g7, %o5 /* IEU0 */
|
|
|
|
|
25: cmp %o4, %o3 /* IEU1 Group */
|
|
|
|
|
5: mov -1, %o0 /* IEU0 */
|
|
|
|
|
retl /* CTI+IEU1 Group */
|
|
|
|
|
|
|
|
|
|
movgu %xcc, 1, %o0 /* Single Group */
|
|
|
|
|
|
|
|
|
|
.align 16
|
|
|
|
|
24: sub %o5, 1, %g7 /* IEU0 Group */
|
|
|
|
|
clr %o0 /* IEU1 */
|
|
|
|
|
or %o5, %g7, %o5 /* IEU0 Group */
|
|
|
|
|
andn %o4, %o5, %o4 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
andn %o3, %o5, %o3 /* IEU1 */
|
|
|
|
|
cmp %o4, %o3 /* IEU1 Group */
|
|
|
|
|
movgu %xcc, 1, %o0 /* Single Group */
|
|
|
|
|
retl /* CTI+IEU1 Group */
|
|
|
|
|
|
|
|
|
|
movlu %xcc, -1, %o0 /* Single Group */
|
|
|
|
|
6: retl /* CTI+IEU1 Group */
|
|
|
|
|
mov %o4, %o0 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
.align 16
|
|
|
|
|
7: ldub [%o0], %o2 /* Load */
|
|
|
|
|
add %o0, 1, %o0 /* IEU1 */
|
|
|
|
|
ldub [%o1], %o3 /* Load Group */
|
|
|
|
|
sllx %g1, 32, %g2 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
8: add %o1, 1, %o1 /* IEU1 */
|
|
|
|
|
subcc %o2, %o3, %o4 /* IEU1 Group */
|
|
|
|
|
bne,pn %xcc, 6b /* CTI */
|
|
|
|
|
lduba [%o0] ASI_PNF, %o2 /* Load */
|
|
|
|
|
|
|
|
|
|
brz,pn %o3, 4b /* CTI+IEU1 Group */
|
|
|
|
|
lduba [%o1] ASI_PNF, %o3 /* Load */
|
|
|
|
|
andcc %o0, 7, %g0 /* IEU1 Group */
|
|
|
|
|
bne,a,pn %icc, 8b /* CTI */
|
|
|
|
|
|
|
|
|
|
add %o0, 1, %o0 /* IEU0 */
|
|
|
|
|
or %g1, %g2, %g1 /* IEU0 Group */
|
|
|
|
|
andcc %o1, 7, %g3 /* IEU1 */
|
|
|
|
|
be,a,pn %icc, 1b /* CTI */
|
|
|
|
|
|
|
|
|
|
ldxa [%o0] ASI_PNF, %o2 /* Load Group */
|
|
|
|
|
9: sllx %g3, 3, %g5 /* IEU0 */
|
|
|
|
|
mov 64, %o5 /* IEU1 */
|
|
|
|
|
sub %o1, %g3, %o1 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
sub %o5, %g5, %o5 /* IEU1 */
|
|
|
|
|
ldxa [%o1] ASI_PNF, %g7 /* Load Group */
|
|
|
|
|
or %g1, %g2, %g1 /* IEU0 */
|
|
|
|
|
sub %o1, %o0, %o1 /* IEU1 */
|
|
|
|
|
|
|
|
|
|
sllx %g1, 7, %g2 /* IEU0 Group */
|
|
|
|
|
add %o1, 8, %o1 /* IEU1 */
|
|
|
|
|
/* %g1 = 0101010101010101
|
|
|
|
|
* %g2 = 8080808080800880
|
|
|
|
|
* %g5 = number of bits to shift left
|
|
|
|
|
* %o5 = number of bits to shift right */
|
|
|
|
|
10: sllx %g7, %g5, %o3 /* IEU0 Group */
|
|
|
|
|
ldxa [%o1 + %o0] ASI_PNF, %g7 /* Load */
|
|
|
|
|
|
|
|
|
|
11: srlx %g7, %o5, %o4 /* IEU0 Group */
|
|
|
|
|
ldxa [%o0] ASI_PNF, %o2 /* Load */
|
|
|
|
|
or %o3, %o4, %o3 /* IEU1 */
|
|
|
|
|
add %o0, 8, %o0 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
subcc %o2, %o3, %g0 /* IEU1 */
|
|
|
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
|
|
|
sub %o2, %g1, %g3 /* IEU0 Group */
|
|
|
|
|
bne,pn %xcc, 13b /* CTI */
|
|
|
|
|
andn %g3, %o2, %g4 /* IEU0 Group */
|
|
|
|
|
|
|
|
|
|
andcc %g4, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
be,pt %xcc, 10b /* CTI */
|
|
|
|
|
srlx %g4, 32, %g4 /* IEU0 */
|
|
|
|
|
andcc %g4, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
#else
|
|
|
|
|
bne,pn %xcc, 13b /* CTI */
|
|
|
|
|
sub %o2, %g1, %g3 /* IEU0 Group */
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pt %xcc, 10b /* CTI */
|
|
|
|
|
srlx %g3, 32, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, %g2, %g0 /* IEU1 Group */
|
|
|
|
|
#endif
|
|
|
|
|
be,pt %xcc, 12f /* CTI */
|
|
|
|
|
|
|
|
|
|
srlx %o2, 56, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
srlx %o2, 48, %g3 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
srlx %o2, 40, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
srlx %o2, 32, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
|
|
|
|
|
12: srlx %o2, 24, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
srlx %o2, 16, %g3 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
srlx %o2, 8, %g3 /* IEU0 */
|
|
|
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
|
|
|
be,pn %icc, 4b /* CTI */
|
|
|
|
|
sllx %g7, %g5, %o3 /* IEU0 */
|
|
|
|
|
|
|
|
|
|
ba,pt %xcc, 11b /* CTI Group */
|
|
|
|
|
ldxa [%o1 + %o0] ASI_PNF, %g7 /* Load */
|
|
|
|
|
END(strcmp)
|
