352 lines
6.6 KiB
ArmAsm
352 lines
6.6 KiB
ArmAsm
/* strcat (dest, src) -- Append SRC on the end of DEST.
|
|
For SPARC v7.
|
|
Copyright (C) 1996-2022 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(strcat)
|
|
mov %o0, %g2
|
|
andcc %o0, 3, %g0
|
|
be 30f
|
|
sethi %hi(0x80808080), %o4
|
|
|
|
ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 1f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be 7f
|
|
or %o4, %lo(0x80808080), %o3
|
|
ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 2f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be 8f
|
|
sethi %hi(0x01010101), %o4
|
|
ldub [%o0], %o5
|
|
cmp %o5, 0
|
|
be 3f
|
|
add %o0, 1, %o0
|
|
b 9f
|
|
or %o4, %lo(0x01010101), %o2
|
|
1: or %o4, %lo(0x80808080), %o3
|
|
2: sethi %hi(0x01010101), %o4
|
|
3: or %o4, %lo(0x01010101), %o2
|
|
b 3f
|
|
sub %o0, 1, %o0
|
|
|
|
30: or %o4, %lo(0x80808080), %o3
|
|
7: sethi %hi(0x01010101), %o4
|
|
8: or %o4, %lo(0x01010101), %o2
|
|
9: ld [%o0], %o5
|
|
7: sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
andcc %o4, %o3, %g0
|
|
be 9b
|
|
add %o0, 4, %o0
|
|
|
|
srl %o5, 24, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 3f
|
|
add %o0, -4, %o0
|
|
srl %o5, 16, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 3f
|
|
add %o0, 1, %o0
|
|
srl %o5, 8, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 3f
|
|
add %o0, 1, %o0
|
|
andcc %o5, 0xff, %g0
|
|
add %o0, 2, %o0
|
|
bne,a 7b
|
|
ld [%o0], %o5
|
|
sub %o0, 1, %o0
|
|
3: andcc %o1, 3, %o4
|
|
be 4f
|
|
nop
|
|
|
|
cmp %o4, 2
|
|
be 11f
|
|
cmp %o4, 3
|
|
ldub [%o1], %o5
|
|
add %o1, 1, %o1
|
|
stb %o5, [%o0]
|
|
be 13f
|
|
cmp %o5, 0
|
|
be 0f
|
|
add %o0, 1, %o0
|
|
11: lduh [%o1], %o5
|
|
add %o1, 2, %o1
|
|
srl %o5, 8, %o4
|
|
cmp %o4, 0
|
|
stb %o4, [%o0]
|
|
bne,a 12f
|
|
stb %o5, [%o0 + 1]
|
|
retl
|
|
mov %g2, %o0
|
|
12: andcc %o5, 0xff, %o5
|
|
bne 4f
|
|
add %o0, 2, %o0
|
|
retl
|
|
mov %g2, %o0
|
|
13: bne 4f
|
|
add %o0, 1, %o0
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
4: andcc %o0, 3, %g3
|
|
bne 12f
|
|
1: ld [%o1], %o5
|
|
add %o1, 4, %o1
|
|
sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
add %o0, 4, %o0
|
|
andcc %o4, %o3, %g0
|
|
be,a 1b
|
|
st %o5, [%o0 - 4]
|
|
|
|
srl %o5, 24, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 1f
|
|
srl %o5, 16, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 2f
|
|
srl %o5, 8, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 3f
|
|
andcc %o5, 0xff, %g0
|
|
bne 1b
|
|
st %o5, [%o0 - 4]
|
|
retl
|
|
mov %g2, %o0
|
|
3: srl %o5, 16, %o5
|
|
sth %o5, [%o0 - 4]
|
|
stb %g0, [%o0 - 2]
|
|
retl
|
|
mov %g2, %o0
|
|
2: srl %o5, 16, %o5
|
|
sth %o5, [%o0 - 4]
|
|
retl
|
|
mov %g2, %o0
|
|
1: stb %g0, [%o0 - 4]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
12: add %o1, 4, %o1
|
|
sub %o5, %o2, %o4
|
|
cmp %g3, 2
|
|
be 2f
|
|
cmp %g3, 3
|
|
be 3f
|
|
andcc %o4, %o3, %g0
|
|
bne 5f
|
|
srl %o5, 24, %g5
|
|
stb %g5, [%o0]
|
|
sub %o0, 1, %o0
|
|
srl %o5, 8, %g5
|
|
sth %g5, [%o0 + 2]
|
|
1: add %o0, 4, %o0
|
|
4: sll %o5, 24, %g6
|
|
ld [%o1], %o5
|
|
add %o1, 4, %o1
|
|
srl %o5, 8, %g5
|
|
sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
or %g5, %g6, %g5
|
|
andcc %o4, %o3, %g0
|
|
be,a 1b
|
|
st %g5, [%o0]
|
|
srl %o5, 24, %o4
|
|
andcc %o4, 0xff, %g0
|
|
be 6f
|
|
srl %o5, 16, %o4
|
|
andcc %o4, 0xff, %g0
|
|
be 7f
|
|
srl %o5, 8, %o4
|
|
st %g5, [%o0]
|
|
andcc %o4, 0xff, %g0
|
|
be 0f
|
|
andcc %o5, 0xff, %g0
|
|
1: bne 4b
|
|
add %o0, 4, %o0
|
|
9: stb %g0, [%o0]
|
|
0: retl
|
|
mov %g2, %o0
|
|
|
|
6: srl %g5, 16, %g5
|
|
sth %g5, [%o0]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
7: srl %g5, 16, %g5
|
|
sth %g5, [%o0]
|
|
stb %g0, [%o0 + 2]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
5: andcc %g5, 0xff, %g4
|
|
be 9b
|
|
srl %o5, 16, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 7f
|
|
srl %o5, 8, %g5
|
|
andcc %g5, 0xff, %g0
|
|
stb %g4, [%o0]
|
|
sth %g5, [%o0 + 1]
|
|
sub %o0, 1, %o0
|
|
bne 1b
|
|
andcc %o5, 0xff, %g0
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
7: stb %g4, [%o0]
|
|
stb %g0, [%o0 + 1]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
2: andcc %o4, %o3, %g0
|
|
bne 5f
|
|
srl %o5, 16, %g5
|
|
sth %g5, [%o0]
|
|
sub %o0, 2, %o0
|
|
1: add %o0, 4, %o0
|
|
4: sll %o5, 16, %g6
|
|
ld [%o1], %o5
|
|
add %o1, 4, %o1
|
|
srl %o5, 16, %g5
|
|
sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
or %g5, %g6, %g5
|
|
andcc %o4, %o3, %g0
|
|
be,a 1b
|
|
st %g5, [%o0]
|
|
srl %o5, 24, %o4
|
|
andcc %o4, 0xff, %g0
|
|
be 7f
|
|
srl %o5, 16, %o4
|
|
st %g5, [%o0]
|
|
andcc %o4, 0xff, %g0
|
|
be 0b
|
|
srl %o5, 8, %o4
|
|
1: andcc %o4, 0xff, %g0
|
|
be 8f
|
|
andcc %o5, 0xff, %g0
|
|
bne 4b
|
|
add %o0, 4, %o0
|
|
sth %o5, [%o0]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
7: srl %g5, 16, %g5
|
|
sth %g5, [%o0]
|
|
stb %g0, [%o0 + 2]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
8: stb %g0, [%o0 + 4]
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
5: srl %o5, 24, %g5
|
|
andcc %g5, 0xff, %g0
|
|
be 9b
|
|
srl %o5, 16, %g5
|
|
andcc %g5, 0xff, %g0
|
|
sth %g5, [%o0]
|
|
sub %o0, 2, %o0
|
|
bne 1b
|
|
srl %o5, 8, %o4
|
|
retl
|
|
mov %g2, %o0
|
|
|
|
3: bne 5f
|
|
srl %o5, 24, %g5
|
|
stb %g5, [%o0]
|
|
sub %o0, 3, %o0
|
|
1: add %o0, 4, %o0
|
|
4: sll %o5, 8, %g6
|
|
ld [%o1], %o5
|
|
add %o1, 4, %o1
|
|
srl %o5, 24, %g5
|
|
sub %o5, %o2, %o4
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o4, %o5, %o4
|
|
#endif
|
|
or %g5, %g6, %g5
|
|
andcc %o4, %o3, %g0
|
|
be 1b
|
|
st %g5, [%o0]
|
|
srl %o5, 24, %o4
|
|
andcc %o4, 0xff, %g0
|
|
be 0b
|
|
srl %o5, 16, %o4
|
|
1: andcc %o4, 0xff, %g0
|
|
be 8b
|
|
srl %o5, 8, %o4
|
|
andcc %o4, 0xff, %g0
|
|
be 9f
|
|
andcc %o5, 0xff, %g0
|
|
bne 4b
|
|
add %o0, 4, %o0
|
|
srl %o5, 8, %o5
|
|
sth %o5, [%o0]
|
|
stb %g0, [%o0 + 2]
|
|
retl
|
|
mov %g2, %o0
|
|
9: srl %o5, 8, %o5
|
|
sth %o5, [%o0 + 4]
|
|
retl
|
|
mov %g2, %o0
|
|
5: andcc %g5, 0xff, %g0
|
|
stb %g5, [%o0]
|
|
sub %o0, 3, %o0
|
|
bne 1b
|
|
srl %o5, 16, %o4
|
|
retl
|
|
mov %g2, %o0
|
|
END(strcat)
|
|
libc_hidden_builtin_def (strcat)
|