diff options
Diffstat (limited to 'gcc-4.8.1/libatomic/tas_n.c')
-rw-r--r-- | gcc-4.8.1/libatomic/tas_n.c | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/gcc-4.8.1/libatomic/tas_n.c b/gcc-4.8.1/libatomic/tas_n.c deleted file mode 100644 index a16d387d8..000000000 --- a/gcc-4.8.1/libatomic/tas_n.c +++ /dev/null @@ -1,115 +0,0 @@ -/* Copyright (C) 2012-2013 Free Software Foundation, Inc. - Contributed by Richard Henderson <rth@redhat.com>. - - This file is part of the GNU Atomic Library (libatomic). - - Libatomic is free software; you can redistribute it and/or modify it - under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - Libatomic 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 General Public License for - more details. - - Under Section 7 of GPL version 3, you are granted additional - permissions described in the GCC Runtime Library Exception, version - 3.1, as published by the Free Software Foundation. - - You should have received a copy of the GNU General Public License and - a copy of the GCC Runtime Library Exception along with this program; - see the files COPYING3 and COPYING.RUNTIME respectively. If not, see - <http://www.gnu.org/licenses/>. */ - -#include "libatomic_i.h" - - -/* If we support the builtin, just use it. */ -#if !DONE && SIZE(HAVE_ATOMIC_TAS) -bool -SIZE(libat_test_and_set) (UTYPE *mptr, int smodel) -{ - if (maybe_specialcase_relaxed(smodel)) - return __atomic_test_and_set (mptr, __ATOMIC_RELAXED); - else if (maybe_specialcase_acqrel(smodel)) - return __atomic_test_and_set (mptr, __ATOMIC_ACQ_REL); - else - return __atomic_test_and_set (mptr, __ATOMIC_SEQ_CST); -} - -#define DONE 1 -#endif /* HAVE_ATOMIC_TAS */ - - -/* If this type is smaller than word-sized, fall back to a word-sized - compare-and-swap loop. */ -#if !DONE && N <= WORDSIZE && defined(atomic_compare_exchange_w) -bool -SIZE(libat_test_and_set) (UTYPE *mptr, int smodel) -{ - UWORD wval, woldval, shift, *wptr, t; - - pre_barrier (smodel); - - if (N < WORDSIZE) - { - wptr = (UWORD *)((uintptr_t)mptr & -WORDSIZE); - shift = SIZE(INVERT_MASK); - } - else - { - wptr = (UWORD *)mptr; - shift = 0; - } - - wval = (UWORD)__GCC_ATOMIC_TEST_AND_SET_TRUEVAL << shift; - woldval = __atomic_load_n (wptr, __ATOMIC_RELAXED); - do - { - t = woldval | wval; - } - while (!atomic_compare_exchange_w (wptr, &woldval, t, true, - __ATOMIC_RELAXED, __ATOMIC_RELAXED)); - - post_barrier (smodel); - return woldval != 0; -} - -#define DONE 1 -#endif /* HAVE_ATOMIC_CAS && N < WORDSIZE */ - - -/* Otherwise, fall back to some sort of protection mechanism. */ -#if !DONE && N == 1 -bool -SIZE(libat_test_and_set) (UTYPE *mptr, int smodel) -{ - UTYPE oldval; - UWORD magic; - - pre_seq_barrier (smodel); - magic = protect_start (mptr); - - oldval = *mptr; - *mptr = __GCC_ATOMIC_TEST_AND_SET_TRUEVAL; - - protect_end (mptr, magic); - post_seq_barrier (smodel); - - return oldval != 0; -} - -#define DONE 1 -#endif /* N == 1 */ - - -#if !DONE -bool -SIZE(libat_test_and_set) (UTYPE *mptr, int smodel UNUSED) -{ - return libat_test_and_set_1 ((U_1 *)mptr, smodel); -} -#endif - -EXPORT_ALIAS (SIZE(test_and_set)); |