154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/* Optimized, inlined string functions. 64 bit S/390 version.
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Copyright (C) 2001 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _STRING_H
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# error "Never use <bits/string.h> directly; include <string.h> instead."
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#endif
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/* The s390 processors can access unaligned multi-byte variables. */
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#define _STRING_ARCH_unaligned 1
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/* We only provide optimizations if the user selects them and if
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GNU CC is used. */
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#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
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&& defined __GNUC__ && __GNUC__ >= 2
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#ifndef __STRING_INLINE
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# ifdef __cplusplus
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# define __STRING_INLINE inline
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# else
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# define __STRING_INLINE extern __inline
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# endif
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#endif
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#define _HAVE_STRING_ARCH_strlen 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE size_t
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strlen (__const char *__str)
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{
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size_t __len;
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__asm__ __volatile__ (" sgr 0,0\n"
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" lgr %0,%1\n"
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"0: srst 0,%0\n"
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" jo 0b\n"
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" lgr %0,0\n"
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" sgr %0,%1"
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: "=&a" (__len) : "a" (__str)
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: "cc", "0" );
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return __len;
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}
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#endif
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/* Copy SRC to DEST. */
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#define _HAVE_STRING_ARCH_strcpy 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE char *
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strcpy (char *__dest, __const char *__src)
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{
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char *tmp = __dest;
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__asm__ __volatile__ (" sgr 0,0\n"
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"0: mvst %0,%1\n"
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" jo 0b"
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: "+&a" (__dest), "+&a" (__src) :
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: "cc", "memory", "0" );
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return tmp;
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}
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#endif
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#define _HAVE_STRING_ARCH_strncpy 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE char *
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strncpy (char *__dest, __const char *__src, size_t __n)
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{
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char *tmp = __dest;
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if (__n <= 0)
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return tmp;
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__asm__ __volatile (" slgr %0,%1\n"
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"0: icm 0,1,0(%1)\n"
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" stc 0,0(%0,%1)\n"
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" jz 2f\n"
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" la %1,1(%1)\n"
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" brct %2,0b\n"
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" j 3f\n"
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"1: la %1,1(%1)\n"
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" stc 0,0(%0,%1)\n"
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"2: brct %2,1b\n"
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"3:"
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: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
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: "cc", "memory", "0" );
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return tmp;
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}
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#endif
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/* Append SRC onto DEST. */
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#define _HAVE_STRING_ARCH_strcat 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE char *
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strcat(char *__dest, const char *__src)
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{
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char *tmp = __dest;
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__asm__ __volatile__ (" sgr 0,0\n"
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"0: srst 0,%0\n"
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" jo 0b\n"
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" lgr %0,0\n"
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" sgr 0,0\n"
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"1: mvst %0,%1\n"
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" jo 1b"
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: "+&a" (__dest), "+&a" (__src) :
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: "cc", "memory", "0" );
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return tmp;
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}
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#endif
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/* Append no more than N characters from SRC onto DEST. */
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#define _HAVE_STRING_ARCH_strncat 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE char *
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strncat (char *__dest, __const char *__src, size_t __n)
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{
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char *tmp = __dest;
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if (__n <= 0)
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return tmp;
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__asm__ __volatile__ (" sgr 0,0\n"
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"0: srst 0,%0\n"
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" jo 0b\n"
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" lgr %0,0\n"
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" slgr %0,%1\n"
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"1: icm 0,1,0(%1)\n"
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" stc 0,0(%0,%1)\n"
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" jz 2f\n"
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" la %1,1(%1)\n"
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" brct %2,1b\n"
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" la %0,0(%0,%1)\n"
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" xc 0(1,%0),0(%0)\n"
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"2:"
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: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
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: "cc", "memory", "0" );
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return tmp;
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}
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#endif
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#endif /* Use string inlines && GNU CC. */
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