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/* Optimized, inlined string functions. S/390 version.
Copyright (C) 2000-2013 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#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
# ifndef __extern_inline
# define __STRING_INLINE inline
# else
# define __STRING_INLINE __extern_inline
# endif
#endif
#define _HAVE_STRING_ARCH_strlen 1
#ifndef _FORCE_INLINES
#define strlen(str) __strlen_g ((str))
__STRING_INLINE size_t __strlen_g (const char *) __asm__ ("strlen");
__STRING_INLINE size_t
__strlen_g (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", "memory", "0" );
return (size_t) (__ptr - __str);
}
#endif
/* Copy SRC to DEST. */
#define _HAVE_STRING_ARCH_strcpy 1
#ifndef _FORCE_INLINES
#define strcpy(dest, src) __strcpy_g ((dest), (src))
__STRING_INLINE char *__strcpy_g (char *, const char *) __asm ("strcpy");
__STRING_INLINE char *
__strcpy_g (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
#define strncpy(dest, src, n) __strncpy_g ((dest), (src), (n))
__STRING_INLINE char *__strncpy_g (char *, const char *, size_t)
__asm__ ("strncpy");
__STRING_INLINE char *
__strncpy_g (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", "memory", "0" );
}
return __ret;
}
#endif
/* Append SRC onto DEST. */
#define _HAVE_STRING_ARCH_strcat 1
#ifndef _FORCE_INLINES
#define strcat(dest, src) __strcat_g ((dest), (src))
__STRING_INLINE char *__strcat_g (char *, const char *) __asm__ ("strcat");
__STRING_INLINE char *
__strcat_g (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", "memory", "0" );
return __ret;
}
#endif
/* Append no more than N characters from SRC onto DEST. */
#define _HAVE_STRING_ARCH_strncat 1
#ifndef _FORCE_INLINES
#define strncat(dest, src, n) __strncat_g ((dest), (src), (n))
__STRING_INLINE char *__strncat_g (char *, const char *, size_t)
__asm__ ("strncat");
__STRING_INLINE char *
__strncat_g (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", "memory", "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", "memory", "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", "memory", "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", "memory", "0" );
__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1;
return __ret;
}
#endif
#endif /* Use string inlines && GNU CC. */
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