110 lines
2.9 KiB
ArmAsm
110 lines
2.9 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/strcmp.c will be
|
|
used. */
|
|
#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
|
|
|
|
#include "asm.h"
|
|
|
|
#ifdef __HS__
|
|
ENTRY (strcmp)
|
|
or r2, r0, r1
|
|
bmsk_s r2, r2, 1
|
|
brne r2, 0, @.Lcharloop
|
|
|
|
; s1 and s2 are word aligned
|
|
ld.ab r2, [r0, 4]
|
|
|
|
mov_s r12, 0x01010101
|
|
ror r11, r12
|
|
.align 4
|
|
.LwordLoop:
|
|
ld.ab r3, [r1, 4]
|
|
; Detect NULL char in str1
|
|
sub r4, r2, r12
|
|
ld.ab r5, [r0, 4]
|
|
bic r4, r4, r2
|
|
and r4, r4, r11
|
|
brne.d.nt r4, 0, .LfoundNULL
|
|
; Check if the read locations are the same
|
|
cmp r2, r3
|
|
beq.d .LwordLoop
|
|
mov.eq r2, r5
|
|
|
|
; A match is found, spot it out
|
|
#ifdef __LITTLE_ENDIAN__
|
|
swape r3, r3
|
|
mov_s r0, 1
|
|
swape r2, r2
|
|
#else
|
|
mov_s r0, 1
|
|
#endif
|
|
cmp_s r2, r3
|
|
j_s.d [blink]
|
|
bset.lo r0, r0, 31
|
|
|
|
.align 4
|
|
.LfoundNULL:
|
|
#ifdef __BIG_ENDIAN__
|
|
swape r4, r4
|
|
swape r2, r2
|
|
swape r3, r3
|
|
#endif
|
|
; Find null byte
|
|
ffs r0, r4
|
|
bmsk r2, r2, r0
|
|
bmsk r3, r3, r0
|
|
swape r2, r2
|
|
swape r3, r3
|
|
; make the return value
|
|
sub.f r0, r2, r3
|
|
mov.hi r0, 1
|
|
j_s.d [blink]
|
|
bset.lo r0, r0, 31
|
|
|
|
.align 4
|
|
.Lcharloop:
|
|
ldb.ab r2, [r0, 1]
|
|
ldb.ab r3, [r1, 1]
|
|
nop
|
|
breq r2, 0, .Lcmpend
|
|
breq r2, r3, .Lcharloop
|
|
|
|
.align 4
|
|
.Lcmpend:
|
|
j_s.d [blink]
|
|
sub r0, r2, r3
|
|
ENDFUNC (strcmp)
|
|
#endif /* __HS__ */
|
|
|
|
#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
|