mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
283 lines
5.7 KiB
ArmAsm
283 lines
5.7 KiB
ArmAsm
/* strchr (str, ch) -- Return pointer to first occurrence of CH in STR.
|
|
For SPARC v7.
|
|
Copyright (C) 1996-2024 Free Software Foundation, Inc.
|
|
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 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* Normally, this uses ((xword - 0x01010101) & 0x80808080) 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 - 0x01010101) & (~xword) & 0x80808080),
|
|
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 4
|
|
ENTRY(strchr)
|
|
andcc %o1, 0xff, %o1
|
|
be 12f
|
|
sll %o1, 8, %o2
|
|
andcc %o0, 3, %g0
|
|
or %o1, %o2, %o2
|
|
sethi %hi(0x80808080), %o4
|
|
sll %o2, 16, %o3
|
|
be 13f
|
|
or %o3, %o2, %g2
|
|
|
|
ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
be 11f
|
|
add %o0, 1, %o0
|
|
cmp %g4, 0
|
|
be 9f
|
|
andcc %o0, 3, %g0
|
|
be 4f
|
|
or %o4, %lo(0x80808080), %o3
|
|
ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
be 11f
|
|
add %o0, 1, %o0
|
|
cmp %g4, 0
|
|
be 9f
|
|
andcc %o0, 3, %g0
|
|
be 5f
|
|
sethi %hi(0x01010101), %o5
|
|
ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
be 11f
|
|
add %o0, 1, %o0
|
|
cmp %g4, 0
|
|
be 9f
|
|
or %o5, %lo(0x01010101), %o2
|
|
b 6f
|
|
ld [%o0], %g4
|
|
11: retl
|
|
sub %o0, 1, %o0
|
|
|
|
13: or %o4, %lo(0x80808080), %o3
|
|
4: sethi %hi(0x01010101), %o5
|
|
5: or %o5, %lo(0x01010101), %o2
|
|
7: ld [%o0], %g4
|
|
6: xor %g4, %g2, %g5
|
|
sub %g4, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
sub %g5, %o2, %g6
|
|
andn %o4, %g4, %o4
|
|
andn %g6, %g5, %g5
|
|
#else
|
|
sub %g5, %o2, %g5
|
|
#endif
|
|
or %g5, %o4, %o4
|
|
andcc %o4, %o3, %g0
|
|
be 7b
|
|
add %o0, 4, %o0
|
|
|
|
/* Check every byte. */
|
|
8: srl %g4, 24, %g5
|
|
7: andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be 4f
|
|
srl %g4, 16, %g5
|
|
andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be 3f
|
|
srl %g4, 8, %g5
|
|
andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be 2f
|
|
andcc %g4, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
bne,a 6b
|
|
ld [%o0], %g4
|
|
retl
|
|
sub %o0, 1, %o0
|
|
2: retl
|
|
sub %o0, 2, %o0
|
|
3: retl
|
|
sub %o0, 3, %o0
|
|
4: retl
|
|
sub %o0, 4, %o0
|
|
9: retl
|
|
clr %o0
|
|
|
|
11: ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 1f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be 4f
|
|
or %o4, %lo(0x80808080), %o3
|
|
ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 1f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be 5f
|
|
sethi %hi(0x01010101), %o4
|
|
ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 1f
|
|
add %o0, 1, %o0
|
|
b 6f
|
|
or %o4, %lo(0x01010101), %o2
|
|
1: retl
|
|
sub %o0, 1, %o0
|
|
|
|
12: andcc %o0, 3, %g0
|
|
bne 11b
|
|
sethi %hi(0x80808080), %o4
|
|
or %o4, %lo(0x80808080), %o3
|
|
4: sethi %hi(0x01010101), %o4
|
|
5: or %o4, %lo(0x01010101), %o2
|
|
6: ld [%o0], %o5
|
|
7: sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
andcc %o4, %o3, %g0
|
|
be 6b
|
|
add %o0, 4, %o0
|
|
|
|
/* Check every byte. */
|
|
srl %o5, 24, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 8f
|
|
add %o0, -4, %o4
|
|
srl %o5, 16, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 8f
|
|
add %o4, 1, %o4
|
|
srl %o5, 8, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 8f
|
|
add %o4, 1, %o4
|
|
andcc %o5, 0xff, %g0
|
|
bne,a 7b
|
|
ld [%o0], %o5
|
|
add %o4, 1, %o4
|
|
8: retl
|
|
mov %o4, %o0
|
|
|
|
13: ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
add %o0, 1, %o0
|
|
be,a 1f
|
|
sub %o0, 1, %o5
|
|
cmp %g4, 0
|
|
be 9f
|
|
1: andcc %o0, 3, %g0
|
|
be 4f
|
|
or %o4, %lo(0x80808080), %o3
|
|
ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
add %o0, 1, %o0
|
|
be,a 1f
|
|
sub %o0, 1, %o5
|
|
cmp %g4, 0
|
|
be 9f
|
|
1: andcc %o0, 3, %g0
|
|
be 5f
|
|
sethi %hi(0x01010101), %o4
|
|
ldub [%o0], %g4
|
|
cmp %g4, %o1
|
|
add %o0, 1, %o0
|
|
be,a 1f
|
|
sub %o0, 1, %o5
|
|
cmp %g4, 0
|
|
be 9f
|
|
1: or %o4, %lo(0x01010101), %o2
|
|
b 7f
|
|
ld [%o0], %g4
|
|
END(strchr)
|
|
|
|
ENTRY(strrchr)
|
|
andcc %o1, 0xff, %o1
|
|
clr %o5
|
|
be 12b
|
|
sll %o1, 8, %o2
|
|
andcc %o0, 3, %g0
|
|
or %o1, %o2, %o2
|
|
sethi %hi(0x80808080), %o4
|
|
sll %o2, 16, %o3
|
|
bne 13b
|
|
or %o3, %o2, %g2
|
|
or %o4, %lo(0x80808080), %o3
|
|
4: sethi %hi(0x01010101), %o4
|
|
5: or %o4, %lo(0x01010101), %o2
|
|
6: ld [%o0], %g4
|
|
7: xor %g4, %g2, %g5
|
|
sub %g4, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
sub %g5, %o2, %g6
|
|
andn %o4, %g4, %o4
|
|
andn %g6, %g5, %g5
|
|
#else
|
|
sub %g5, %o2, %g5
|
|
#endif
|
|
or %g5, %o4, %o4
|
|
andcc %o4, %o3, %g0
|
|
be 6b
|
|
add %o0, 4, %o0
|
|
|
|
/* Check every byte. */
|
|
3: srl %g4, 24, %g5
|
|
8: andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be,a 1f
|
|
sub %o0, 4, %o5
|
|
1: srl %g4, 16, %g5
|
|
andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be,a 1f
|
|
sub %o0, 3, %o5
|
|
1: srl %g4, 8, %g5
|
|
andcc %g5, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be,a 1f
|
|
sub %o0, 2, %o5
|
|
1: andcc %g4, 0xff, %g5
|
|
be 9f
|
|
cmp %g5, %o1
|
|
be,a 1f
|
|
sub %o0, 1, %o5
|
|
1: b 7b
|
|
ld [%o0], %g4
|
|
9: retl
|
|
mov %o5, %o0
|
|
END(strrchr)
|
|
|
|
weak_alias (strchr, index)
|
|
weak_alias (strrchr, rindex)
|
|
libc_hidden_builtin_def (strchr)
|
|
libc_hidden_builtin_def (strrchr)
|