116 lines
3.2 KiB
ArmAsm
116 lines
3.2 KiB
ArmAsm
/*
|
|
Copyright (c) 2015, Synopsys, Inc. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
1) Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
2) Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
|
|
3) Neither the name of the Synopsys, Inc., nor the names of its contributors
|
|
may be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* This implementation is optimized for performance. For code size a generic
|
|
implementation of this function from newlib/libc/string/strlen.c will be
|
|
used. */
|
|
#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
|
|
|
|
#include "asm.h"
|
|
#if (defined (__ARC700__) || defined (__EM__) || defined (__HS__)) \
|
|
&& defined (__ARC_NORM__) && defined (__Xbarrel_shifter)
|
|
|
|
ENTRY (strlen)
|
|
or r3,r0,7
|
|
ld r2,[r3,-7]
|
|
ld.a r6,[r3,-3]
|
|
mov r4,0x01010101
|
|
; uses long immediate
|
|
#ifdef __LITTLE_ENDIAN__
|
|
asl_s r1,r0,3
|
|
btst_s r0,2
|
|
asl r7,r4,r1
|
|
ror r5,r4
|
|
sub r1,r2,r7
|
|
bic_s r1,r1,r2
|
|
mov.eq r7,r4
|
|
sub r12,r6,r7
|
|
bic r12,r12,r6
|
|
or.eq r12,r12,r1
|
|
and r12,r12,r5
|
|
brne r12,0,.Learly_end
|
|
#else /* BIG ENDIAN */
|
|
ror r5,r4
|
|
btst_s r0,2
|
|
mov_s r1,31
|
|
sub3 r7,r1,r0
|
|
sub r1,r2,r4
|
|
bic_s r1,r1,r2
|
|
bmsk r1,r1,r7
|
|
sub r12,r6,r4
|
|
bic r12,r12,r6
|
|
bmsk.ne r12,r12,r7
|
|
or.eq r12,r12,r1
|
|
and r12,r12,r5
|
|
brne r12,0,.Learly_end
|
|
#endif /* ENDIAN */
|
|
|
|
.Loop:
|
|
ld_s r2,[r3,4]
|
|
ld.a r6,[r3,8]
|
|
; stall for load result
|
|
sub r1,r2,r4
|
|
bic_s r1,r1,r2
|
|
sub r12,r6,r4
|
|
bic r12,r12,r6
|
|
or_l r12,r12,r1
|
|
and r12,r12,r5
|
|
breq_l r12,0,.Loop
|
|
.Lend:
|
|
and.f r1,r1,r5
|
|
sub.ne r3,r3,4
|
|
mov.eq r1,r12
|
|
#ifdef __LITTLE_ENDIAN__
|
|
sub_s r2,r1,1
|
|
bic_s r2,r2,r1
|
|
norm r1,r2
|
|
sub_s r0,r0,3
|
|
lsr_s r1,r1,3
|
|
sub r0,r3,r0
|
|
j_s.d [blink]
|
|
sub_l r0,r0,r1
|
|
#else /* BIG ENDIAN */
|
|
lsr_s r1,r1,7
|
|
mov.eq r2,r6
|
|
bic_s r1,r1,r2
|
|
norm r1,r1
|
|
sub r0,r3,r0
|
|
lsr_s r1,r1,3
|
|
j_s.d [blink]
|
|
add_l r0,r0,r1
|
|
#endif /* ENDIAN */
|
|
.Learly_end:
|
|
b.d .Lend
|
|
sub_s.ne r1,r1,r1
|
|
ENDFUNC (strlen)
|
|
#endif /* (__ARC700__ || __EM__ || __HS__) && __ARC_NORM__ && _Xbarrel_shifter */
|
|
|
|
#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
|