From 4372980f5881e7d537a52e3c49588ce116088061 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Mon, 10 Feb 2014 10:54:47 -0500 Subject: Move tilegx, tilepro, and linux-generic from ports to libc. I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy, along with the linux-generic ports infrastructure. Beyond the README update, the move was just git mv ports/sysdeps/tile sysdeps/tile git mv ports/sysdeps/unix/sysv/linux/tile \ sysdeps/unix/sysv/linux/tile git mv ports/sysdeps/unix/sysv/linux/generic \ sysdeps/unix/sysv/linux/generic I updated the relevant ChangeLogs along the lines of the ARM move in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that there were no changes in "objdump -dr" output in the shared objects. --- sysdeps/tile/tilegx/strrchr.c | 68 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 sysdeps/tile/tilegx/strrchr.c (limited to 'sysdeps/tile/tilegx/strrchr.c') diff --git a/sysdeps/tile/tilegx/strrchr.c b/sysdeps/tile/tilegx/strrchr.c new file mode 100644 index 0000000000..f201cfa4fa --- /dev/null +++ b/sysdeps/tile/tilegx/strrchr.c @@ -0,0 +1,68 @@ +/* Copyright (C) 2011-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Chris Metcalf , 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 + . */ + +#include +#include +#include "string-endian.h" + +char * +strrchr (const char *s, int c) +{ + /* Get an aligned pointer. */ + const uintptr_t s_int = (uintptr_t) s; + const uint64_t *p = (const uint64_t *) (s_int & -8); + + /* Create eight copies of the byte for which we are looking. */ + const uint64_t goal = copy_byte(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). */ + const uint64_t before_mask = MASK (s_int); + uint64_t v = (*p | before_mask) ^ (goal & __insn_v1shrui (before_mask, 1)); + const char *found = NULL; + uint64_t zero_matches, goal_matches; + while (1) + { + /* Look for a terminating '\0'. */ + zero_matches = __insn_v1cmpeqi (v, 0); + + /* Look for the goal byte. */ + goal_matches = __insn_v1cmpeq (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 = CFZ (zero_matches); + goal_matches &= NULMASK (first_nul); + } + if (__builtin_expect (goal_matches != 0, 1)) + found = ((char *) p) + 7 - (REVCZ (goal_matches) >> 3); + } + + if (__builtin_expect (zero_matches != 0, 0)) + return (char *) found; + + v = *++p; + } +} +weak_alias (strrchr, rindex) +libc_hidden_builtin_def (strrchr) -- cgit v1.2.1