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-rw-r--r--gcc-4.8.1/libatomic/load_n.c115
1 files changed, 0 insertions, 115 deletions
diff --git a/gcc-4.8.1/libatomic/load_n.c b/gcc-4.8.1/libatomic/load_n.c
deleted file mode 100644
index 8861bf4a2..000000000
--- a/gcc-4.8.1/libatomic/load_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_LDST)
-UTYPE
-SIZE(libat_load) (UTYPE *mptr, int smodel)
-{
- if (maybe_specialcase_relaxed(smodel))
- return __atomic_load_n (mptr, __ATOMIC_RELAXED);
- else if (maybe_specialcase_acqrel(smodel))
- /* Note that REL and ACQ_REL are not valid for loads. */
- return __atomic_load_n (mptr, __ATOMIC_ACQUIRE);
- else
- return __atomic_load_n (mptr, __ATOMIC_SEQ_CST);
-}
-
-#define DONE 1
-#endif /* HAVE_ATOMIC_LOAD */
-
-
-/* If we have compare-and-swap, use it to swap 0 with 0 and as a side
- effect load the original value. */
-#if !DONE && defined(atomic_compare_exchange_n)
-UTYPE
-SIZE(libat_load) (UTYPE *mptr, int smodel)
-{
- UTYPE t = 0;
-
- if (maybe_specialcase_relaxed(smodel))
- atomic_compare_exchange_n (mptr, &t, 0, true,
- __ATOMIC_RELAXED, __ATOMIC_RELAXED);
- else if (maybe_specialcase_acqrel(smodel))
- atomic_compare_exchange_n (mptr, &t, 0, true,
- __ATOMIC_ACQ_REL, __ATOMIC_ACQ_REL);
- else
- atomic_compare_exchange_n (mptr, &t, 0, true,
- __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
-
- return t;
-}
-
-#define DONE 1
-#endif /* atomic_compare_exchange_n */
-
-
-/* Similar, but only assume a word-sized compare-and-swap. */
-#if !DONE && N < WORDSIZE && defined(atomic_compare_exchange_w)
-UTYPE
-SIZE(libat_load) (UTYPE *mptr, int smodel)
-{
- UWORD shift, t, *wptr;
-
- pre_barrier (smodel);
-
- wptr = (UWORD *)((uintptr_t)mptr & -WORDSIZE);
- shift = (((uintptr_t)mptr % WORDSIZE) * CHAR_BIT) ^ SIZE(INVERT_MASK);
-
- /* Exchange 0 with 0, placing the old value of *WPTR in T. */
- t = 0;
- atomic_compare_exchange_w (wptr, &t, 0);
-
- post_barrier (smodel);
- return t >> shift;
-}
-
-#define DONE 1
-#endif /* HAVE_ATOMIC_CAS && N < WORDSIZE */
-
-
-/* Otherwise, fall back to some sort of protection mechanism. */
-#if !DONE
-UTYPE
-SIZE(libat_load) (UTYPE *mptr, int smodel)
-{
- UTYPE ret;
- UWORD magic;
-
- pre_seq_barrier (smodel);
- magic = protect_start (mptr);
-
- ret = *mptr;
-
- protect_end (mptr, magic);
- post_seq_barrier (smodel);
-
- return ret;
-}
-#endif
-
-EXPORT_ALIAS (SIZE(load));