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https://sourceware.org/git/glibc.git
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253 lines
6.4 KiB
C
253 lines
6.4 KiB
C
/* Optimized, inlined string functions. S/390 version.
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Copyright (C) 2000, 2001, 2007, 2012 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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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# ifndef __extern_inline
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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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#define strlen(str) __strlen_g ((str))
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__STRING_INLINE size_t __strlen_g (const char *) __asm__ ("strlen");
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__STRING_INLINE size_t
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__strlen_g (const char *__str)
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{
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char *__ptr, *__tmp;
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__ptr = (char *) 0;
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__tmp = (char *) __str;
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__asm__ __volatile__ (" la 0,0\n"
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"0: srst %0,%1\n"
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" jo 0b\n"
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: "+&a" (__ptr), "+&a" (__tmp) :
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: "cc", "memory", "0" );
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return (size_t) (__ptr - __str);
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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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#define strcpy(dest, src) __strcpy_g ((dest), (src))
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__STRING_INLINE char *__strcpy_g (char *, const char *) __asm ("strcpy");
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__STRING_INLINE char *
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__strcpy_g (char *__dest, const char *__src)
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{
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char *tmp = __dest;
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__asm__ __volatile__ (" la 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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#define strncpy(dest, src, n) __strncpy_g ((dest), (src), (n))
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__STRING_INLINE char *__strncpy_g (char *, const char *, size_t)
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__asm__ ("strncpy");
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__STRING_INLINE char *
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__strncpy_g (char *__dest, const char *__src, size_t __n)
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{
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char *__ret = __dest;
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char *__ptr;
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size_t __diff;
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if (__n > 0) {
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__diff = (size_t) (__dest - __src);
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__ptr = (char *) __src;
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__asm__ __volatile__ (" j 1f\n"
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"0: la %0,1(%0)\n"
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"1: icm 0,1,0(%0)\n"
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" stc 0,0(%2,%0)\n"
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" jz 3f\n"
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#if defined(__s390x__)
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" brctg %1,0b\n"
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#else
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" brct %1,0b\n"
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#endif
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" j 4f\n"
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"2: la %0,1(%0)\n"
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" stc 0,0(%2,%0)\n"
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#if defined(__s390x__)
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"3: brctg %1,2b\n"
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#else
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"3: brct %1,2b\n"
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#endif
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"4:"
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: "+&a" (__ptr), "+&a" (__n) : "a" (__diff)
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: "cc", "memory", "0" );
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}
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return __ret;
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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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#define strcat(dest, src) __strcat_g ((dest), (src))
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__STRING_INLINE char *__strcat_g (char *, const char *) __asm__ ("strcat");
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__STRING_INLINE char *
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__strcat_g (char *__dest, const char *__src)
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{
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char *__ret = __dest;
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char *__ptr, *__tmp;
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/* Move __ptr to the end of __dest. */
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__ptr = (char *) 0;
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__tmp = __dest;
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__asm__ __volatile__ (" la 0,0\n"
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"0: srst %0,%1\n"
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" jo 0b\n"
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: "+&a" (__ptr), "+&a" (__tmp) :
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: "cc", "0" );
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/* Now do the copy. */
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__asm__ __volatile__ (" la 0,0\n"
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"0: mvst %0,%1\n"
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" jo 0b"
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: "+&a" (__ptr), "+&a" (__src) :
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: "cc", "memory", "0" );
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return __ret;
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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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#define strncat(dest, src, n) __strncat_g ((dest), (src), (n))
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__STRING_INLINE char *__strncat_g (char *, const char *, size_t)
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__asm__ ("strncat");
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__STRING_INLINE char *
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__strncat_g (char *__dest, const char *__src, size_t __n)
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{
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char *__ret = __dest;
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char *__ptr, *__tmp;
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size_t __diff;
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if (__n > 0) {
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/* Move __ptr to the end of __dest. */
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__ptr = (char *) 0;
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__tmp = __dest;
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__asm__ __volatile__ (" la 0,0\n"
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"0: srst %0,%1\n"
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" jo 0b\n"
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: "+&a" (__ptr), "+&a" (__tmp) :
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: "cc", "memory", "0" );
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__diff = (size_t) (__ptr - __src);
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__tmp = (char *) __src;
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__asm__ __volatile__ (" j 1f\n"
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"0: la %0,1(%0)\n"
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"1: icm 0,1,0(%0)\n"
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" stc 0,0(%2,%0)\n"
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" jz 2f\n"
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#if defined(__s390x__)
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" brctg %1,0b\n"
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#else
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" brct %1,0b\n"
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#endif
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" slr 0,0\n"
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" stc 0,1(%2,%0)\n"
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"2:"
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: "+&a" (__tmp), "+&a" (__n) : "a" (__diff)
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: "cc", "memory", "0" );
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}
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return __ret;
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}
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#endif
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/* Search N bytes of S for C. */
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#define _HAVE_STRING_ARCH_memchr 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE void *
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memchr (const void *__str, int __c, size_t __n)
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{
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char *__ptr, *__tmp;
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__tmp = (char *) __str;
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__ptr = (char *) __tmp + __n;
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__asm__ __volatile__ (" lhi 0,0xff\n"
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" nr 0,%2\n"
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"0: srst %0,%1\n"
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" jo 0b\n"
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" brc 13,1f\n"
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" la %0,0\n"
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"1:"
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: "+&a" (__ptr), "+&a" (__tmp) : "d" (__c)
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: "cc", "memory", "0" );
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return __ptr;
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}
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#endif
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/* Search N bytes of S for C. */
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#define _HAVE_STRING_ARCH_memchr 1
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#ifndef _FORCE_INLINES
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__STRING_INLINE int
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strcmp (const char *__s1, const char *__s2)
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{
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char *__p1, *__p2;
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int __ret;
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__p1 = (char *) __s1;
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__p2 = (char *) __s2;
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__asm__ __volatile__ (" slr 0,0\n"
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"0: clst %1,%2\n"
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" jo 0b\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (__ret), "+&a" (__p1), "+&a" (__p2) :
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: "cc", "memory", "0" );
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__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1;
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return __ret;
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}
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#endif
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#endif /* Use string inlines && GNU CC. */
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