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MFp4: Pentium-optimised implementation of wcscmp(). Performs significantly

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better than the code generated by gcc in many cases.
This commit is contained in:
Tim J. Robbins 2003-03-10 10:54:36 +00:00
parent f5bbe11124
commit 00d7d210f5
2 changed files with 80 additions and 1 deletions
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2
lib/libc/i386/string/Makefile.inc
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@ -3,4 +3,4 @@
MDSRCS+=bcmp.S bcopy.S bzero.S ffs.S index.S memchr.S memcmp.S memcpy.S \
memmove.S memset.S rindex.S strcat.S strchr.S strcmp.S strcpy.S \
strlen.S strncmp.S strrchr.S swab.S
strlen.S strncmp.S strrchr.S swab.S wcscmp.S

79
lib/libc/i386/string/wcscmp.S Normal file
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@ -0,0 +1,79 @@
/*-
* Copyright (c) 2003 Tim J. Robbins.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
/*
* int
* wcscmp(const wchar_t *s1, const wchar_t *s2) --
* Return an integer greater than, equal to, or less than 0, when
* the string s1 is greater than, equal to, or less than the string s2.
*/
ENTRY(wcscmp)
pushl %edi
pushl %esi
movl 12(%esp),%edi /* s1 */
movl 16(%esp),%esi /* s2 */
.p2align 4,0x90
top: movl (%edi),%eax
cmpl %eax,(%esi)
jne no0
testl %eax,%eax
jz same
movl 4(%edi),%eax
cmpl %eax,4(%esi)
jne no4
testl %eax,%eax
jz same
movl 8(%edi),%eax
cmpl %eax,8(%esi)
jne no8
testl %eax,%eax
jz same
movl 12(%edi),%eax
cmpl %eax,12(%esi)
jne no12
leal 16(%edi),%edi
leal 16(%esi),%esi
testl %eax,%eax
jnz top
.p2align 2,0x90
same: xorl %eax,%eax
popl %esi
popl %edi
ret
.p2align 2,0x90
no12: leal 4(%esi),%esi
.p2align 2,0x90
no8: leal 4(%esi),%esi
.p2align 2,0x90
no4: leal 4(%esi),%esi
.p2align 2,0x90
no0: subl (%esi),%eax
popl %esi
popl %edi
ret