diff options
Diffstat (limited to 'sysdeps/alpha/strchr.c')
-rw-r--r-- | sysdeps/alpha/strchr.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/sysdeps/alpha/strchr.c b/sysdeps/alpha/strchr.c deleted file mode 100644 index 69afa4b87f..0000000000 --- a/sysdeps/alpha/strchr.c +++ /dev/null @@ -1,84 +0,0 @@ -/* Copyright (C) 1992, 1993, 1994, 1995 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> - -/* Return the length of the null-terminated string STR. Scan for - the null terminator quickly by testing eight bytes at a time. */ - -char * -strchr (const char *str, int c) -{ - const char *char_ptr; - const unsigned long int *longword_ptr; - unsigned long int charmask; - - 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 = str; ((unsigned long int) char_ptr & 7) != 0; ++char_ptr) - if (*char_ptr == c) - return (char *) char_ptr; - else if (*char_ptr == '\0') - return NULL; - - 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, zero; - - /* Set bits in ZERO if bytes in LONGWORD are zero. */ - asm ("cmpbge $31, %1, %0" : "=r" (zero) : "r" (longword)); - - /* 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 (zero || (ge & le)) - { - /* Which of the bytes was the C? */ - - char *cp = (char *) (longword_ptr - 1); - int i; - - for (i = 0; i < 8; i++) - { - if (cp[i] == c) - return &cp[i]; - if (cp[i] == 0) - return NULL; - } - return NULL; - } - } -} - -#ifdef weak_alias -#undef index -weak_alias (strchr, index) -#endif |