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Diffstat (limited to 'sysdeps/tile/tilepro/strrchr.c')
| -rw-r--r-- | sysdeps/tile/tilepro/strrchr.c | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/sysdeps/tile/tilepro/strrchr.c b/sysdeps/tile/tilepro/strrchr.c deleted file mode 100644 index 49d0bfbea1..0000000000 --- a/sysdeps/tile/tilepro/strrchr.c +++ /dev/null @@ -1,73 +0,0 @@ -/* Copyright (C) 2011-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library. If not, see - <http://www.gnu.org/licenses/>. */ - -#include <string.h> -#include <stdint.h> - -char * -strrchr (const char *s, int c) -{ - /* Get an aligned pointer. */ - const uintptr_t s_int = (uintptr_t) s; - const uint32_t *p = (const uint32_t *) (s_int & -4); - - /* Create four copies of the byte for which we are looking. */ - const uint32_t goal = 0x01010101 * (uint8_t) c; - - /* Read the first aligned word, but force bytes before the string to - match neither zero nor goal (we make sure the high bit of each - byte is 1, and the low 7 bits are all the opposite of the goal - byte). Note that this shift count expression works because we - know shift counts are taken mod 32. */ - const uint32_t before_mask = (1 << (s_int << 3)) - 1; - uint32_t v = (*p | before_mask) ^ (goal & __insn_shrib (before_mask, 1)); - const char *found = NULL; - uint32_t zero_matches, goal_matches; - while (1) - { - /* Look for a terminating '\0'. */ - zero_matches = __insn_seqb (v, 0); - - /* Look for the goal byte. */ - goal_matches = __insn_seqb (v, goal); - - /* If we found the goal, record the last offset. */ - if (__builtin_expect (goal_matches != 0, 0)) - { - if (__builtin_expect (zero_matches != 0, 0)) - { - /* Clear any goal after the first zero. */ - int first_nul = __insn_ctz (zero_matches); - /* The number of top bits we need to clear is - 32 - (first_nul + 8). */ - int shift_amt = (24 - first_nul); - goal_matches <<= shift_amt; - goal_matches >>= shift_amt; - } - if (__builtin_expect (goal_matches != 0, 1)) - found = ((char *) p) + 3 - (__insn_clz (goal_matches) >> 3); - } - - if (__builtin_expect (zero_matches != 0, 0)) - return (char *) found; - - v = *++p; - } -} -weak_alias (strrchr, rindex) -libc_hidden_builtin_def (strrchr) |