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/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
than N.
For SPARC v7.
Copyright (C) 1996,1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jj@ultra.linux.cz> and
David S. Miller <davem@caip.rutgers.edu>.
This version is developed using the same algorithm as the fast C
version which carries the following introduction:
Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
with help from Dan Sahlin (dan@sics.se) and
commentary by Jim Blandy (jimb@ai.mit.edu);
adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
and implemented by Roland McGrath (roland@ai.mit.edu).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
.text
.align 4
0: cmp %o2, 0
be 9f
sethi %hi(0x80808080), %o4
ldub [%o0], %g4
cmp %g4, %o1
be 1f
add %o0, 1, %o0
subcc %o2, 1, %o2
be 9f
andcc %o0, 3, %g0
be 4f
or %o4, %lo(0x80808080), %o3
ldub [%o0], %g4
cmp %g4, %o1
be 1f
add %o0, 1, %o0
subcc %o2, 1, %o2
be 9f
andcc %o0, 3, %g0
be 5f
sethi %hi(0x01010101), %o5
ldub [%o0], %g4
cmp %g4, %o1
be 1f
add %o0, 1, %o0
subcc %o2, 1, %o2
bne,a 7f
and %o2, 3, %g1
retl
clr %o0
1: retl
sub %o0, 1, %o0
ENTRY(__memchr)
andcc %o1, 0xff, %o1
sll %o1, 8, %g7
andcc %o0, 3, %g0
or %o1, %g7, %g7
sll %g7, 16, %o3
bne 0b
or %o3, %g7, %g2
sethi %hi(0x80808080), %o4
or %o4, %lo(0x80808080), %o3
4: sethi %hi(0x01010101), %o5
5: and %o2, 3, %g1
7: andcc %o2, 0xfffffffc, %o2
be 0f
or %o5, %lo(0x01010101), %g7
ld [%o0], %g4
6: xor %g4, %g2, %g5
add %o0, 4, %o0
sub %g5, %g7, %g5
andcc %g5, %o3, %g0
bne 8f
subcc %o2, 4, %o2
bne,a 6b
ld [%o0], %g4
0: cmp %g1, 0
1: be 9f
add %o0, 4, %o0
ldub [%o0 - 4], %g4
cmp %g4, %o1
be 4f
cmp %g1, 1
be 9f
ldub [%o0 - 3], %g4
cmp %g4, %o1
be 3f
cmp %g1, 2
be 9f
ldub [%o0 - 2], %g4
cmp %g4, %o1
be 2f
nop
9: retl
clr %o0
/* Check every byte. */
8: srl %g4, 24, %g5
and %g5, 0xff, %g5
cmp %g5, %o1
be 4f
srl %g4, 16, %g5
and %g5, 0xff, %g5
cmp %g5, %o1
be 3f
srl %g4, 8, %g5
and %g5, 0xff, %g5
cmp %g5, %o1
be 2f
and %g4, 0xff, %g5
cmp %g5, %o1
be 1f
cmp %o2, 0
bne,a 6b
ld [%o0], %g4
b 1b
cmp %g1, 0
1: retl
sub %o0, 1, %o0
2: retl
sub %o0, 2, %o0
3: retl
sub %o0, 3, %o0
4: retl
sub %o0, 4, %o0
END(__memchr)
weak_alias (__memchr, memchr)
#if !__BOUNDED_POINTERS__
weak_alias (__memchr, __ubp_memchr)
#endif
|
