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Add arm asm version of memcmp, basically it's strncmp.S without the 

check for *src != 0
This commit is contained in:
chris 2002-11-23 14:26:04 +00:00
parent 9d672e72f5
commit 0caaced5a9
2 changed files with 61 additions and 3 deletions
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6
lib/libc/arch/arm/string/Makefile.inc
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@ -1,8 +1,8 @@
# $NetBSD: Makefile.inc,v 1.4 2002/11/23 03:10:27 chris Exp $
# $NetBSD: Makefile.inc,v 1.5 2002/11/23 14:26:04 chris Exp $
SRCS+= memcpy.S _memcpy.S bcopy.S memmove.S memset.S bzero.S ffs.S strcmp.S
SRCS+= strncmp.S
SRCS+= bcmp.c index.c memchr.c memcmp.c \
SRCS+= strncmp.S memcmp.S
SRCS+= bcmp.c index.c memchr.c \
rindex.c strcat.c strcpy.c strcspn.c strlen.c \
strncat.c strncpy.c strpbrk.c strsep.c \
strspn.c strstr.c swab.c

58
lib/libc/arch/arm/string/memcmp.S Normal file
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@ -0,0 +1,58 @@
/* $NetBSD: memcmp.S,v 1.1 2002/11/23 14:26:04 chris Exp $ */
/*
* 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.
*/
#include <machine/asm.h>
RCSID("$NetBSD: memcmp.S,v 1.1 2002/11/23 14:26:04 chris Exp $")
ENTRY(memcmp)
/* if ((len - 1) < 0) return 0 */
subs r2, r2, #1
movmi r0, #0
#ifdef __APCS_26__
movmis pc, 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
cmpcs r2, r3
beq 1b
sub r0, r2, r3
#ifdef __APCS_26__
movs pc, lr
#else
mov pc, lr
#endif