diff options
Diffstat (limited to 'sysdeps/alpha/memchr.c')
-rw-r--r-- | sysdeps/alpha/memchr.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/sysdeps/alpha/memchr.c b/sysdeps/alpha/memchr.c deleted file mode 100644 index a911302ea6..0000000000 --- a/sysdeps/alpha/memchr.c +++ /dev/null @@ -1,86 +0,0 @@ -/* Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc. - -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., 675 Mass Ave, -Cambridge, MA 02139, USA. */ - -#include <string.h> - -/* Search no more than N bytes of S for C. */ - -void * -memchr (const void *s, int c, size_t n) -{ - const char *char_ptr; - const unsigned long int *longword_ptr; - unsigned long int charmask; - size_t x; - - c = (unsigned char) c; - - /* Handle the first few characters by reading one character at a time. - Do this until STR is aligned on a 8-byte border. */ - for (char_ptr = s; n > 0 && ((unsigned long int) char_ptr & 7) != 0; - --n, ++char_ptr) - if (*char_ptr == c) - return (void *) char_ptr; - - if (n == (size_t)0) - return NULL; - - x = n; - - longword_ptr = (unsigned long int *) char_ptr; - - /* Set up a longword, each of whose bytes is C. */ - charmask = c | (c << 8); - charmask |= charmask << 16; - charmask |= charmask << 32; - - for (;;) - { - const unsigned long int longword = *longword_ptr++; - int ge, le; - - if (x < 4) - x = (size_t) 0; - else - x -= 4; - - /* Set bits in GE if bytes in CHARMASK are >= bytes in LONGWORD. */ - asm ("cmpbge %1, %2, %0" : "=r" (ge) : "r" (charmask), "r" (longword)); - - /* Set bits in LE if bytes in CHARMASK are <= bytes in LONGWORD. */ - asm ("cmpbge %2, %1, %0" : "=r" (le) : "r" (charmask), "r" (longword)); - - /* Bytes that are both <= and >= are == to C. */ - if (ge & le) - { - /* Which of the bytes was the C? */ - - unsigned char *cp = (unsigned char *) (longword_ptr - 1); - int i; - - for (i = 0; i < 7; i++) - if (cp[i] == c) - return &cp[i]; - return &cp[7]; - } - - if (x == (size_t)0) - break; - } - - return NULL; -} |