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Add i386 assembly versions of bcmp & memcmp

This commit is contained in:
jtc 1993-06-17 23:00:41 +00:00
parent 0837b9168a
commit 276bb25851
3 changed files with 124 additions and 1 deletions
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60
lib/libc/i386/string/bcmp.s Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (c) 1993 Winning Strategies, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "DEFS.h"
/*
* bcmp (void *b1, void *b2, size_t len)
*
* Written by:
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
*/
/*
* XXX should compare by words
*/
#include "DEFS.h"
ENTRY(bcmp)
pushl %edi
pushl %esi
movl 12(%esp),%edi
movl 16(%esp),%esi
movl 20(%esp),%ecx
xorl %eax,%eax /* clear return value */
cld /* set compare direction forward */
repe /* compare! */
cmpsb
je L1 /* matches! */
incl %eax
L1: popl %esi
popl %edi
ret

63
lib/libc/i386/string/memcmp.s Normal file
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@ -0,0 +1,63 @@
/*
* Copyright (c) 1993 Winning Strategies, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "DEFS.h"
/*
* memcmp (void *b1, void *b2, size_t len)
*
* Written by:
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
*/
/*
* XXX should compare by words
*/
#include "DEFS.h"
ENTRY(memcmp)
pushl %edi
pushl %esi
movl 12(%esp),%edi
movl 16(%esp),%esi
movl 20(%esp),%ecx
xorl %eax,%eax /* clear return value */
cld /* set compare direction forward */
repe /* compare! */
cmpsb
je L1 /* matches! */
movsbl -1(%edi),%eax /* unsigned comparison */
movsbl -1(%esi),%edx
subl %edx,%eax
L1: popl %esi
popl %edi
ret

2
lib/libc/string/Makefile.inc
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@ -12,7 +12,7 @@ SRCS+= bcmp.s bcopy.s bzero.s ffs.s index.s memchr.c memcmp.c memset.c \
strncat.c strncmp.s strncpy.s strpbrk.c strsep.c \
strspn.c strstr.c
.elif (${MACHINE} == "i386")
SRCS+= bcmp.c bcopy.s bzero.s ffs.s index.s memchr.s memcmp.c memset.s \
SRCS+= bcmp.s bcopy.s bzero.s ffs.s index.s memchr.s memcmp.s memset.s \
rindex.s strcat.s strcmp.s strcpy.s strcspn.c strlen.s \
strncat.c strncmp.s strncpy.c strpbrk.c strsep.c \
strspn.c strstr.c