232 lines
6.3 KiB
C
232 lines
6.3 KiB
C
/* Optimized, inlined string functions. S/390 version.
|
|
Copyright (C) 2000, 2001 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
|
|
|
|
#ifndef __STRING_INLINE
|
|
# ifdef __cplusplus
|
|
# define __STRING_INLINE inline
|
|
# else
|
|
# define __STRING_INLINE extern __inline
|
|
# endif
|
|
#endif
|
|
|
|
#define _HAVE_STRING_ARCH_strlen 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE size_t
|
|
strlen (__const char *__str)
|
|
{
|
|
char *__ptr, *__tmp;
|
|
|
|
__ptr = (char *) 0;
|
|
__tmp = (char *) __str;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "0" );
|
|
return (size_t) (__ptr - __str);
|
|
}
|
|
#endif
|
|
|
|
/* Copy SRC to DEST. */
|
|
#define _HAVE_STRING_ARCH_strcpy 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE char *
|
|
strcpy (char *__dest, __const char *__src)
|
|
{
|
|
char *tmp = __dest;
|
|
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: mvst %0,%1\n"
|
|
" jo 0b"
|
|
: "+&a" (__dest), "+&a" (__src) :
|
|
: "cc", "memory", "0" );
|
|
return tmp;
|
|
}
|
|
#endif
|
|
|
|
#define _HAVE_STRING_ARCH_strncpy 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE char *
|
|
strncpy (char *__dest, __const char *__src, size_t __n)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr;
|
|
size_t __diff;
|
|
|
|
if (__n > 0) {
|
|
__diff = (size_t) (__dest - __src);
|
|
__ptr = (char *) __src;
|
|
__asm__ __volatile__ (" j 1f\n"
|
|
"0: la %0,1(%0)\n"
|
|
"1: icm 0,1,0(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
" jz 3f\n"
|
|
#if defined(__s390x__)
|
|
" brctg %1,0b\n"
|
|
#else
|
|
" brct %1,0b\n"
|
|
#endif
|
|
" j 4f\n"
|
|
"2: la %0,1(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
#if defined(__s390x__)
|
|
"3: brctg %1,2b\n"
|
|
#else
|
|
"3: brct %1,2b\n"
|
|
#endif
|
|
"4:"
|
|
: "+&a" (__ptr), "+&a" (__n) : "a" (__diff)
|
|
: "cc", "0" );
|
|
}
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Append SRC onto DEST. */
|
|
#define _HAVE_STRING_ARCH_strcat 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE char *
|
|
strcat(char *__dest, const char *__src)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr, *__tmp;
|
|
|
|
/* Move __ptr to the end of __dest. */
|
|
__ptr = (char *) 0;
|
|
__tmp = __dest;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "0" );
|
|
|
|
/* Now do the copy. */
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: mvst %0,%1\n"
|
|
" jo 0b"
|
|
: "+&a" (__ptr), "+&a" (__src) :
|
|
: "cc", "0" );
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Append no more than N characters from SRC onto DEST. */
|
|
#define _HAVE_STRING_ARCH_strncat 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE char *
|
|
strncat (char *__dest, __const char *__src, size_t __n)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr, *__tmp;
|
|
size_t __diff;
|
|
|
|
if (__n > 0) {
|
|
/* Move __ptr to the end of __dest. */
|
|
__ptr = (char *) 0;
|
|
__tmp = __dest;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "0" );
|
|
|
|
__diff = (size_t) (__ptr - __src);
|
|
__tmp = (char *) __src;
|
|
__asm__ __volatile__ (" j 1f\n"
|
|
"0: la %0,1(%0)\n"
|
|
"1: icm 0,1,0(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
" jz 2f\n"
|
|
#if defined(__s390x__)
|
|
" brctg %1,0b\n"
|
|
#else
|
|
" brct %1,0b\n"
|
|
#endif
|
|
" slr 0,0\n"
|
|
" stc 0,1(%2,%0)\n"
|
|
"2:"
|
|
: "+&a" (__tmp), "+&a" (__n) : "a" (__diff)
|
|
: "cc", "0" );
|
|
|
|
}
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Search N bytes of S for C. */
|
|
#define _HAVE_STRING_ARCH_memchr 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE void *
|
|
memchr (__const void *__str, int __c, size_t __n)
|
|
{
|
|
char *__ptr, *__tmp;
|
|
|
|
__tmp = (char *) __str;
|
|
__ptr = (char *) __tmp + __n;
|
|
__asm__ __volatile__ (" lhi 0,0xff\n"
|
|
" nr 0,%2\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
" brc 13,1f\n"
|
|
" la %0,0\n"
|
|
"1:"
|
|
: "+&a" (__ptr), "+&a" (__tmp) : "d" (__c)
|
|
: "cc", "0" );
|
|
return __ptr;
|
|
}
|
|
#endif
|
|
|
|
/* Search N bytes of S for C. */
|
|
#define _HAVE_STRING_ARCH_memchr 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE int
|
|
strcmp (__const char *__s1, __const char *__s2)
|
|
{
|
|
char *__p1, *__p2;
|
|
int __ret;
|
|
|
|
__p1 = (char *) __s1;
|
|
__p2 = (char *) __s2;
|
|
__asm__ __volatile__ (" slr 0,0\n"
|
|
"0: clst %1,%2\n"
|
|
" jo 0b\n"
|
|
" ipm %0\n"
|
|
" srl %0,28"
|
|
: "=d" (__ret), "+&a" (__p1), "+&a" (__p2) :
|
|
: "cc", "0" );
|
|
__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1;
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
#endif /* Use string inlines && GNU CC. */
|