ARM specific optimized string functions.

diff --git a/sysdeps/arm/bits/string.h b/sysdeps/arm/bits/string.h
new file mode 100644 (file)
index 0000000..8dce456
--- /dev/null
+++ b/sysdeps/arm/bits/string.h
@@ -0,0 +1,150 @@
+/* Optimized, inlined string functions.  ARM version.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   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
+
+/* We must defeat the generic optimized versions of these functions in
+   <bits/string2.h> since they don't work on the ARM.  */
+#define _HAVE_STRING_ARCH_strcpy 1
+#define _HAVE_STRING_ARCH_stpcpy 1
+
+/* We only provide optimizations if GNU CC is used and this is a little
+   endian system (the code below does not work on big endian machines).
+   With current versions of GCC these optimi\ations produce quite a large
+   amount of code so we only enable them if the user specifically asked
+   for it.  */
+#if !defined __NO_STRING_INLINES && defined __GNUC__ && __GNUC__ >= 2 \
+ && !defined __ARMEB__ && defined __USE_STRING_INLINES
+
+/* Copy SRC to DEST.  */
+#define strcpy(dest, src) \
+  (__extension__ (__builtin_constant_p (src)                                 \
+                 ? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8         \
+                    ? __strcpy_small (dest, src, strlen (src) + 1)           \
+                    : (char *) memcpy (dest, src, strlen (src) + 1))         \
+                 : strcpy (dest, src)))
+
+#define __strcpy_small(dest, src, srclen) \
+  (__extension__ ({ char *__dest = (char *) (dest);                          \
+                   const char *__src = (const char *) (src);                 \
+                   size_t __srclen = (srclen);                               \
+                   switch (__srclen)                                         \
+                     {                                                       \
+                     case 5:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 1:                                                 \
+                       *__dest++ = '\0';                                     \
+                       break;                                                \
+                     case 6:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 2:                                                 \
+                       *((unsigned short int *) __dest) =                    \
+                            __src[0];                                        \
+                       __dest += 2;                                          \
+                       break;                                                \
+                     case 7:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 3:                                                 \
+                       *((unsigned short int *) __dest) =                    \
+                            *((const unsigned short int *) (__src));         \
+                       __dest[2] = '\0';                                     \
+                       __dest += 3;                                          \
+                       break;                                                \
+                     case 8:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 4:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned short int *) (__src)) |        \
+                            (__src[2] << 16);                                \
+                       __dest += 4;                                          \
+                       break;                                                \
+                   }                                                         \
+                 (__dest - __srclen) ; }))
+
+/* Copy SRC to DEST, returning pointer to final NUL byte.  */
+#define __stpcpy(dest, src) \
+  (__extension__ (__builtin_constant_p (src)                                 \
+                 ? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8         \
+                    ? __stpcpy_small (dest, src, strlen (src) + 1)           \
+                    : ((char *) __mempcpy (dest, src, strlen (src) + 1) - 1))\
+                 : __stpcpy (dest, src)))
+
+#define __stpcpy_small(dest, src, srclen) \
+  (__extension__ ({ char *__dest = (char *) (dest);                          \
+                   const char *__src = (const char *) (src);                 \
+                   switch (srclen)                                           \
+                     {                                                       \
+                     case 5:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 1:                                                 \
+                       *__dest++ = '\0';                                     \
+                       break;                                                \
+                     case 6:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 2:                                                 \
+                       *((unsigned short int *) __dest) =                    \
+                            __src[0];                                        \
+                       __dest += 2;                                          \
+                       break;                                                \
+                     case 7:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 3:                                                 \
+                       *((unsigned short int *) __dest) =                    \
+                            *((const unsigned short int *) (__src));         \
+                       __dest[2] = '\0';                                     \
+                       __dest += 3;                                          \
+                       break;                                                \
+                     case 8:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned long int *) (__src));          \
+                       __dest += 4;                                          \
+                       __src += 4;                                           \
+                     case 4:                                                 \
+                       *((unsigned long int *) __dest) =                     \
+                            *((const unsigned short int *) (__src)) |        \
+                            (__src[2] << 16);                                \
+                       __dest += 4;                                          \
+                       break;                                                \
+                   }                                                         \
+                 __dest; }))
+
+#endif