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/* Optimized, inlined string functions. s390 version.
Copyright (C) 2000 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _STRING_H
# error "Never use <bits/string.h> directly; include <string.h> instead."
#endif
/* The s390 processors can access unaligned multi-byte variables. */
#define _STRING_ARCH_unaligned 1
/* We only provide optimizations if the user selects them and if
GNU CC is used. */
#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
&& defined __GNUC__ && __GNUC__ >= 2
#ifdef __cplusplus
# define __STRING_INLINE inline
#else
# define __STRING_INLINE extern __inline
#endif
#define _HAVE_STRING_ARCH_strlen 1
__STRING_INLINE size_t
strlen (__const char *__str)
{
size_t __len;
__asm__ __volatile__ (" sr 0,0\n"
" lr %0,%1\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" sr %0,%1"
: "=&a" (__len) : "a" (__str)
: "cc", "0" );
return __len;
}
/* Copy SRC to DEST. */
#define _HAVE_STRING_ARCH_strcpy 1
__STRING_INLINE char *
strcpy (char *__dest, __const char *__src)
{
char *tmp = __dest;
__asm__ __volatile__ (" sr 0,0\n"
"0: mvst %0,%1\n"
" jo 0b"
: "+&a" (__dest), "+&a" (__src) :
: "cc", "memory", "0" );
return tmp;
}
#define _HAVE_STRING_ARCH_strncpy 1
__STRING_INLINE char *
strncpy (char *__dest, __const char *__src, size_t __n)
{
char *tmp = __dest;
if (__n <= 0)
return tmp;
__asm__ __volatile (" slr %0,%1\n"
"0: icm 0,1,0(%1)\n"
" stc 0,0(%0,%1)\n"
" jz 2f\n"
" la %1,1(%1)\n"
" brct %2,0b\n"
" j 3f\n"
"1: la %1,1(%1)\n"
" stc 0,0(%0,%1)\n"
"2: brct %2,1b\n"
"3:"
: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
: "cc", "memory", "0" );
return tmp;
}
/* Append SRC onto DEST. */
#define _HAVE_STRING_ARCH_strcat 1
__STRING_INLINE char *
strcat(char *__dest, const char *__src)
{
char *tmp = __dest;
__asm__ __volatile__ (" sr 0,0\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" sr 0,0\n"
"1: mvst %0,%1\n"
" jo 1b"
: "+&a" (__dest), "+&a" (__src) :
: "cc", "memory", "0" );
return tmp;
}
/* Append no more than N characters from SRC onto DEST. */
#define _HAVE_STRING_ARCH_strncat 1
__STRING_INLINE char *
strncat (char *__dest, __const char *__src, size_t __n)
{
char *tmp = __dest;
if (__n <= 0)
return tmp;
__asm__ __volatile__ (" sr 0,0\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" slr %0,%1\n"
"1: icm 0,1,0(%1)\n"
" stc 0,0(%0,%1)\n"
" jz 2f\n"
" la %1,1(%1)\n"
" brct %2,1b\n"
" la %0,0(%0,%1)\n"
" xc 0(1,%0),0(%0)\n"
"2:"
: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
: "cc", "memory", "0" );
return tmp;
}
#endif /* Use string inlines && GNU CC. */
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