171 lines
5.4 KiB
ArmAsm
171 lines
5.4 KiB
ArmAsm
/* rawmemchr (str, ch) -- Return pointer to first occurrence of CH in STR.
|
|
For SPARC v9.
|
|
Copyright (C) 1999-2022 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>
|
|
#include <asm/asi.h>
|
|
#ifndef XCC
|
|
#define XCC xcc
|
|
#define USE_BPR
|
|
.register %g2, #scratch
|
|
.register %g3, #scratch
|
|
#endif
|
|
|
|
/* 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(__rawmemchr)
|
|
and %o1, 0xff, %o1 /* IEU0 Group */
|
|
sethi %hi(0x01010101), %g1 /* IEU1 */
|
|
ldub [%o0], %o3 /* Load */
|
|
sll %o1, 8, %o4 /* IEU0 Group */
|
|
|
|
or %g1, %lo(0x01010101), %g1 /* IEU1 */
|
|
sllx %g1, 32, %g2 /* IEU0 Group */
|
|
or %o4, %o1, %o4 /* IEU1 */
|
|
andcc %o0, 7, %g0 /* IEU1 Group */
|
|
|
|
sll %o4, 16, %g5 /* IEU0 */
|
|
or %o4, %g5, %o4 /* IEU0 Group */
|
|
or %g1, %g2, %g1 /* IEU1 */
|
|
bne,pn %icc, 32f /* CTI */
|
|
|
|
sllx %o4, 32, %g5 /* IEU0 Group */
|
|
cmp %o3, %o1 /* IEU1 */
|
|
be,pn %icc, 30f /* CTI */
|
|
sllx %g1, 7, %g2 /* IEU0 Group */
|
|
|
|
18: ldx [%o0], %o3 /* Load */
|
|
or %o4, %g5, %o4 /* IEU1 */
|
|
add %o0, 8, %o0 /* IEU0 Group */
|
|
19: xor %o3, %o4, %o3 /* IEU0 Group */
|
|
|
|
sub %o3, %g1, %o2 /* IEU0 Group */
|
|
#ifdef EIGHTBIT_NOT_RARE
|
|
andn %o2, %o3, %o5 /* IEU0 Group */
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o5, %g2, %g0 /* IEU1 Group */
|
|
#else
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o2, %g2, %g0 /* IEU1 Group */
|
|
#endif
|
|
be,pt %xcc, 19b /* CTI */
|
|
|
|
add %o0, 8, %o0 /* IEU0 */
|
|
addcc %o2, %g1, %g3 /* IEU1 Group */
|
|
srlx %o2, 32, %o2 /* IEU0 */
|
|
20: andcc %o2, %g2, %g0 /* IEU1 Group */
|
|
|
|
be,pn %xcc, 21f /* CTI */
|
|
srlx %g3, 56, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 29f /* CTI */
|
|
|
|
srlx %g3, 48, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 28f /* CTI */
|
|
srlx %g3, 40, %o2 /* IEU0 */
|
|
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 27f /* CTI */
|
|
srlx %g3, 32, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
|
|
be,pn %icc, 26f /* CTI */
|
|
21: srlx %g3, 24, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 25f /* CTI */
|
|
|
|
srlx %g3, 16, %o2 /* IEU0 */
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 24f /* CTI */
|
|
srlx %g3, 8, %o2 /* IEU0 */
|
|
|
|
andcc %o2, 0xff, %g0 /* IEU1 Group */
|
|
be,pn %icc, 23f /* CTI */
|
|
xor %o3, %o4, %o3 /* IEU0 */
|
|
andcc %g3, 0xff, %g0 /* IEU1 Group */
|
|
|
|
be,pn %icc, 22f /* CTI */
|
|
sub %o3, %g1, %o2 /* IEU0 */
|
|
ldxa [%o0] ASI_PNF, %o3 /* Load */
|
|
andcc %o2, %g2, %g0 /* IEU1 Group */
|
|
|
|
be,pt %xcc, 19b /* CTI */
|
|
add %o0, 8, %o0 /* IEU0 */
|
|
addcc %o2, %g1, %g3 /* IEU1 Group */
|
|
ba,pt %xcc, 20b /* CTI */
|
|
|
|
srlx %o2, 32, %o2 /* IEU0 */
|
|
|
|
.align 16
|
|
22: retl /* CTI+IEU1 Group */
|
|
add %o0, -9, %o0 /* IEU0 */
|
|
23: retl /* CTI+IEU1 Group */
|
|
add %o0, -10, %o0 /* IEU0 */
|
|
|
|
24: retl /* CTI+IEU1 Group */
|
|
add %o0, -11, %o0 /* IEU0 */
|
|
25: retl /* CTI+IEU1 Group */
|
|
add %o0, -12, %o0 /* IEU0 */
|
|
|
|
26: retl /* CTI+IEU1 Group */
|
|
add %o0, -13, %o0 /* IEU0 */
|
|
27: retl /* CTI+IEU1 Group */
|
|
add %o0, -14, %o0 /* IEU0 */
|
|
|
|
28: retl /* CTI+IEU1 Group */
|
|
add %o0, -15, %o0 /* IEU0 */
|
|
29: retl /* CTI+IEU1 Group */
|
|
add %o0, -16, %o0 /* IEU0 */
|
|
|
|
30: retl /* CTI+IEU1 Group */
|
|
nop /* IEU0 */
|
|
|
|
.align 16
|
|
32: andcc %o0, 7, %g0 /* IEU1 Group */
|
|
be,a,pn %icc, 18b /* CTI */
|
|
sllx %g1, 7, %g2 /* IEU0 */
|
|
add %o0, 1, %o0 /* IEU0 Group */
|
|
|
|
cmp %o3, %o1 /* IEU1 */
|
|
bne,a,pt %icc, 32b /* CTI */
|
|
lduba [%o0] ASI_PNF, %o3 /* Load */
|
|
retl /* CTI+IEU1 Group */
|
|
|
|
add %o0, -1, %o0 /* IEU0 */
|
|
END(__rawmemchr)
|
|
|
|
libc_hidden_def (__rawmemchr)
|
|
weak_alias (__rawmemchr, rawmemchr)
|