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ARM specific optimized string functions.
This commit is contained in:
Ulrich Drepper
parent
33a6c3dded
commit
64082f3e9c
150
sysdeps/arm/bits/string.h
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150
sysdeps/arm/bits/string.h
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/* Optimized, inlined string functions. ARM version.
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Copyright (C) 1998 Free Software Foundation, Inc.
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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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/* We must defeat the generic optimized versions of these functions in
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<bits/string2.h> since they don't work on the ARM. */
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#define _HAVE_STRING_ARCH_strcpy 1
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#define _HAVE_STRING_ARCH_stpcpy 1
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/* We only provide optimizations if GNU CC is used and this is a little
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endian system (the code below does not work on big endian machines).
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With current versions of GCC these optimi\ations produce quite a large
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amount of code so we only enable them if the user specifically asked
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for it. */
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#if !defined __NO_STRING_INLINES && defined __GNUC__ && __GNUC__ >= 2 \
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&& !defined __ARMEB__ && defined __USE_STRING_INLINES
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/* Copy SRC to DEST. */
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#define strcpy(dest, src) \
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(__extension__ (__builtin_constant_p (src) \
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? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
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? __strcpy_small (dest, src, strlen (src) + 1) \
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: (char *) memcpy (dest, src, strlen (src) + 1)) \
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: strcpy (dest, src)))
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#define __strcpy_small(dest, src, srclen) \
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(__extension__ ({ char *__dest = (char *) (dest); \
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const char *__src = (const char *) (src); \
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size_t __srclen = (srclen); \
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switch (__srclen) \
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{ \
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case 5: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 1: \
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*__dest++ = '\0'; \
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break; \
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case 6: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 2: \
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*((unsigned short int *) __dest) = \
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__src[0]; \
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__dest += 2; \
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break; \
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case 7: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 3: \
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*((unsigned short int *) __dest) = \
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*((const unsigned short int *) (__src)); \
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__dest[2] = '\0'; \
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__dest += 3; \
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break; \
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case 8: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 4: \
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*((unsigned long int *) __dest) = \
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*((const unsigned short int *) (__src)) | \
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(__src[2] << 16); \
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__dest += 4; \
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break; \
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} \
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(__dest - __srclen) ; }))
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/* Copy SRC to DEST, returning pointer to final NUL byte. */
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#define __stpcpy(dest, src) \
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(__extension__ (__builtin_constant_p (src) \
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? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
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? __stpcpy_small (dest, src, strlen (src) + 1) \
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: ((char *) __mempcpy (dest, src, strlen (src) + 1) - 1))\
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: __stpcpy (dest, src)))
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#define __stpcpy_small(dest, src, srclen) \
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(__extension__ ({ char *__dest = (char *) (dest); \
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const char *__src = (const char *) (src); \
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switch (srclen) \
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{ \
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case 5: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 1: \
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*__dest++ = '\0'; \
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break; \
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case 6: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 2: \
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*((unsigned short int *) __dest) = \
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__src[0]; \
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__dest += 2; \
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break; \
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case 7: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 3: \
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*((unsigned short int *) __dest) = \
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*((const unsigned short int *) (__src)); \
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__dest[2] = '\0'; \
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__dest += 3; \
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break; \
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case 8: \
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*((unsigned long int *) __dest) = \
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*((const unsigned long int *) (__src)); \
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__dest += 4; \
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__src += 4; \
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case 4: \
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*((unsigned long int *) __dest) = \
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*((const unsigned short int *) (__src)) | \
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(__src[2] << 16); \
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__dest += 4; \
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break; \
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} \
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__dest; }))
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#endif
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