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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/libatomic/gload.c | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/libatomic/gload.c')
-rw-r--r-- | gcc-4.9/libatomic/gload.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/gcc-4.9/libatomic/gload.c b/gcc-4.9/libatomic/gload.c new file mode 100644 index 000000000..420033710 --- /dev/null +++ b/gcc-4.9/libatomic/gload.c @@ -0,0 +1,100 @@ +/* Copyright (C) 2012-2014 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 natively support the load, and if we're unconcerned with extra + barriers (e.g. fully in-order cpu for which barriers are a nop), then + go ahead and expand the operation inline. */ +#if !defined(WANT_SPECIALCASE_RELAXED) && !defined(__OPTIMIZE_SIZE__) +# define EXACT_INLINE(N, DEST, SRC, DONE) \ + if (C2(HAVE_ATOMIC_LDST_,N)) \ + { \ + DEST = __atomic_load_n (SRC, __ATOMIC_SEQ_CST); \ + DONE; \ + } +#else +# define EXACT_INLINE(N, DEST, SRC, DONE) +#endif + + +#define EXACT_(N, DEST, SRC, DONE) \ + do { \ + EXACT_INLINE (N, DEST, SRC, DONE); \ + DEST = C3(local_,load_,N) (SRC, smodel); \ + DONE; \ + } while (0) + +#define EXACT(N) \ + do { \ + if (!C2(HAVE_INT,N)) break; \ + if ((uintptr_t)mptr & (N - 1)) break; \ + EXACT_(N, *PTR(N,rptr), PTR(N,mptr), return); \ + } while (0) + +#define LARGER(N) \ + do { \ + if (!C2(HAVE_INT,N)) break; \ + r = (uintptr_t)mptr & (N - 1); \ + a = (uintptr_t)mptr & -N; \ + if (r + n <= N) \ + EXACT_ (N, u.C2(i,N), PTR(N,a), goto Lfinish); \ + } while (0) + + +void +libat_load (size_t n, void *mptr, void *rptr, int smodel) +{ + union max_size_u u; + uintptr_t r, a; + + switch (n) + { + case 0: return; + case 1: EXACT(1); goto L4; + case 2: EXACT(2); goto L4; + case 4: EXACT(4); goto L8; + case 8: EXACT(8); goto L16; + case 16: EXACT(16); break; + + case 3: L4: LARGER(4); /* FALLTHRU */ + case 5 ... 7: L8: LARGER(8); /* FALLTHRU */ + case 9 ... 15: L16: LARGER(16); break; + + Lfinish: + memcpy (rptr, u.b + r, n); + return; + } + + pre_seq_barrier (smodel); + libat_lock_n (mptr, n); + + memcpy (rptr, mptr, n); + + libat_unlock_n (mptr, n); + post_seq_barrier (smodel); +} + +EXPORT_ALIAS (load); |