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#ifndef _KVI_STRASM_H_
#define _KVI_STRASM_H_
//=============================================================================
//
// File : kvi_strasm.h
// Creation date : Sun Jun 18 2000 18:38:26 by Szymon Stefanek
//
// This file is part of the KVirc irc client distribution
// Copyright (C) 1999-2000 Szymon Stefanek (pragma at kvirc dot net)
//
// This program is FREE software. You can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your opinion) any later version.
//
// This program is distributed in the HOPE that it will be USEFUL,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, write to the Free Software Foundation,
// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================
//=============================================================================
//
// Inline assembly implementations of the commonly used string functions
// These will work only on i386 based machines and can be compiled
// only by gcc
//
//=============================================================================
extern inline bool kvi_strEqualCS(const char * str1,const char * str2)
{
// An instruction pattern is really useful in this case.
// When inlining, GCC can optimize to load esi and edi
// directly with the strings , without pushing and getting it
// from the stack...
bool eax;
__asm__ __volatile__ (
" cld\n"
"1:\n"
" lodsb %%ds:(%%esi),%%al\n"
" scasb %%es:(%%edi),%%al\n"
" jne 2f\n"
" testb %%al,%%al\n"
" jne 1b\n"
" movl $0x1,%%eax\n"
" jmp 3f\n"
"2:\n"
" xorl %%eax,%%eax\n"
"3:"
: "=a" (eax), "=&S" (str1), "=&D" (str2)
: "1" (str1), "2" (str2)
);
return eax;
}
extern inline bool kvi_strEqualCSN(const char * str1,const char * str2,int len)
{
bool eax;
__asm__ __volatile__ (
"1:\n"
" decl %3\n"
" js 2f\n"
" movb (%1),%%al\n"
" incl %1\n"
" cmpb %%al,(%2)\n"
" jne 3f\n"
" incl %2\n"
" testb %%al,%%al\n"
" jne 1b\n"
"2:\n"
" movl $0x1,%%eax\n"
" jmp 4f\n"
"3:\n"
" xorl %%eax,%%eax\n"
"4:\n"
: "=a" (eax), "=r" (str1), "=r" (str2), "=r" (len)
: "1" (str1), "2" (str2), "3" (len)
);
return eax;
}
// OPTIMIZATION
// The following two functions are used to compare a variable string with one in that
// only A-Z<->a-z case insensivity is significant.
// For example
// kvi_strEqualNoLocalCI("a string that does not contain any strange char",str2)
// will always give the correct result
// These will NOT work with localizable characters:
// 'a' with umlaut will be not equal to 'A' with umlaut
extern inline bool kvi_strEqualNoLocaleCI(const char *str1,const char *str2)
{
// Trivial implementation
// Ignores completely locales....only A-Z chars are transformed to a-z
// Anyway...it will work for IRC :)
int reg;
bool eax;
__asm__ __volatile__ (
"1:\n"
" movb (%2),%%al\n"
" cmpb $65,%%al\n"
" jb 2f\n"
" cmpb $90,%%al\n"
" ja 2f\n"
" addb $32,%%al\n"
"2:\n"
" movb (%3),%b1\n"
" cmpb $65,%b1\n"
" jb 3f\n"
" cmpb $90,%b1\n"
" ja 3f\n"
" addb $32,%b1\n"
"3:\n"
" cmpb %%al,%b1\n"
" jne 4f\n"
" incl %2\n"
" incl %3\n"
" testb %%al,%%al\n"
" jne 1b\n"
" movl $1,%%eax\n"
" jmp 5f\n"
"4:\n"
" xorl %%eax,%%eax\n"
"5:\n"
: "=a" (eax), "=q" (reg), "=r" (str1), "=r" (str2)
: "2" (str1), "3" (str2)
);
return eax;
}
extern inline bool kvi_strEqualNoLocaleCIN(const char *str1,const char *str2,int len)
{
int reg;
bool eax;
__asm__ __volatile__ (
"1:\n"
" decl %4\n"
" js 4f\n"
" movb (%2),%%al\n"
" cmpb $65,%%al\n"
" jb 2f\n"
" cmpb $90,%%al\n"
" ja 2f\n"
" addb $32,%%al\n"
"2:\n"
" movb (%3),%b1\n"
" cmpb $65,%b1\n"
" jb 3f\n"
" cmpb $90,%b1\n"
" ja 3f\n"
" addb $32,%b1\n"
"3:\n"
" cmpb %%al,%b1\n"
" jne 5f\n"
" incl %2\n"
" incl %3\n"
" testb %%al,%%al\n"
" jne 1b\n"
"4:\n"
" movl $1,%%eax\n"
" jmp 6f\n"
"5:\n"
" xorl %%eax,%%eax\n"
"6:\n"
: "=a" (eax), "=q" (reg), "=r" (str1), "=r" (str2), "=r" (len)
: "2" (str1), "3" (str2), "4" (len)
);
return eax;
}
extern inline int kvi_strLen(const char * str)
{
int ecx;
__asm__ __volatile__(
" cld\n"
" repne\n"
" scasb\n"
" notl %0\n"
" decl %0"
: "=c" (ecx), "=&D" (str)
: "0" (0xffffffff), "1" (str), "a" (0)
);
return ecx;
}
#endif //_KVI_STRASM_H_
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