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/*
* Copyright (c) 2002 ARM Ltd
* 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. The name of the company may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
*
* Adapted for uClibc from NetBSD memcmp.S, version 1.2 2003/04/05
* by Erik Andersen <andersen@codepoet.org>
*/
#include <features.h>
#include <bits/arm_asm.h>
#include <bits/arm_bx.h>
.text
.global memcmp
.type memcmp,%function
.align 4
#if defined(THUMB1_ONLY)
.thumb_func
memcmp:
cmp r2, #0
bne 1f
mov r0, #0
bx lr
1:
push {r4}
add r4, r0, r2
2:
ldrb r2, [r0]
add r0, r0, #1
ldrb r3, [r1]
add r1, r1, #1
cmp r4, r0
beq 3f
cmp r2, r3
beq 2b
3:
sub r0, r2, r3
pop {r4}
bx lr
#else
memcmp:
/* if ((len - 1) < 0) return 0 */
subs r2, r2, #1
IT(tt, mi)
movmi r0, #0
#if defined(__USE_BX__)
bxmi lr
#else
movmi pc, lr
#endif
/* ip == last src address to compare */
add ip, r0, r2
1:
ldrb r2, [r0], #1
ldrb r3, [r1], #1
cmp ip, r0
IT(t, cs)
cmpcs r2, r3
beq 1b
sub r0, r2, r3
#if defined(__USE_BX__)
bx lr
#else
mov pc, lr
#endif
#endif
.size memcmp,.-memcmp
libc_hidden_def(memcmp)
#ifdef __UCLIBC_SUSV3_LEGACY__
strong_alias(memcmp,bcmp)
#endif
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