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author | Dan Albert <danalbert@google.com> | 2016-02-24 13:48:45 -0800 |
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committer | Dan Albert <danalbert@google.com> | 2016-02-24 13:51:18 -0800 |
commit | b9de1157289455b0ca26daff519d4a0ddcd1fa13 (patch) | |
tree | 4c56cc0a34b91f17033a40a455f26652304f7b8d /gcc-4.8.3/libatomic/store_n.c | |
parent | 098157a754787181cfa10e71325832448ddcea98 (diff) | |
download | toolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.tar.gz toolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.tar.bz2 toolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.zip |
Update 4.8.1 to 4.8.3.
My previous drop was the wrong version. The platform mingw is
currently using 4.8.3, not 4.8.1 (not sure how I got that wrong).
From ftp://ftp.gnu.org/gnu/gcc/gcc-4.8.3/gcc-4.8.3.tar.bz2.
Bug: http://b/26523949
Change-Id: Id85f1bdcbbaf78c7d0b5a69e74c798a08f341c35
Diffstat (limited to 'gcc-4.8.3/libatomic/store_n.c')
-rw-r--r-- | gcc-4.8.3/libatomic/store_n.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/gcc-4.8.3/libatomic/store_n.c b/gcc-4.8.3/libatomic/store_n.c new file mode 100644 index 000000000..062c01415 --- /dev/null +++ b/gcc-4.8.3/libatomic/store_n.c @@ -0,0 +1,112 @@ +/* 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) +void +SIZE(libat_store) (UTYPE *mptr, UTYPE newval, int smodel) +{ + if (maybe_specialcase_relaxed(smodel)) + __atomic_store_n (mptr, newval, __ATOMIC_RELAXED); + else if (maybe_specialcase_acqrel(smodel)) + /* Note that ACQ and ACQ_REL are not valid for store. */ + __atomic_store_n (mptr, newval, __ATOMIC_RELEASE); + else + __atomic_store_n (mptr, newval, __ATOMIC_SEQ_CST); +} + +#define DONE 1 +#endif /* HAVE_ATOMIC_STORE */ + +/* If we have compare-and-swap, use it perform the store. */ +#if !DONE && defined(atomic_compare_exchange_n) +void +SIZE(libat_store) (UTYPE *mptr, UTYPE newval, int smodel) +{ + UTYPE oldval; + + pre_barrier (smodel); + + oldval = *mptr; + while (!atomic_compare_exchange_n (mptr, &oldval, newval, true, + __ATOMIC_RELAXED, __ATOMIC_RELAXED)) + continue; + + post_barrier (smodel); +} + +#define DONE 1 +#endif /* atomic_compare_exchange_n */ + + +/* 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) +void +SIZE(libat_store) (UTYPE *mptr, UTYPE newval, int smodel) +{ + UWORD mask, shift, woldval, wnewval, t, *wptr; + + pre_barrier (smodel); + + wptr = (UWORD *)((uintptr_t)mptr & -WORDSIZE); + shift = (((uintptr_t)mptr % WORDSIZE) * CHAR_BIT) ^ SIZE(INVERT_MASK); + mask = SIZE(MASK) << shift; + + wnewval = (UWORD)newval << shift; + woldval = __atomic_load_n (wptr, __ATOMIC_RELAXED); + do + { + t = (woldval & ~mask) | wnewval; + } + while (!atomic_compare_exchange_w (wptr, &woldval, t)); + + post_barrier (smodel); +} + +#define DONE 1 +#endif /* N < WORDSIZE && atomic_compare_exchange_w */ + + +/* Otherwise, fall back to some sort of protection mechanism. */ +#if !DONE +void +SIZE(libat_store) (UTYPE *mptr, UTYPE newval, int smodel) +{ + UWORD magic; + + pre_seq_barrier (smodel); + magic = protect_start (mptr); + + *mptr = newval; + + protect_end (mptr, magic); + post_seq_barrier (smodel); +} +#endif + +EXPORT_ALIAS (SIZE(store)); |