2 * Copyright 2014 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkBarriers_arm_DEFINED
9 #define SkBarriers_arm_DEFINED
11 static inline void sk_compiler_barrier() { asm volatile("" : : : "memory"); }
14 T sk_acquire_load(T* ptr) {
16 __sync_synchronize(); // Issue a full barrier, which is an overkill acquire barrier.
21 T sk_consume_load(T* ptr) {
23 // Unlike acquire, consume loads (data-dependent loads) are guaranteed not to reorder on ARM.
24 // No memory barrier is needed, so we just use a compiler barrier.
25 // C.f. http://preshing.com/20140709/the-purpose-of-memory_order_consume-in-cpp11/
26 sk_compiler_barrier();
31 void sk_release_store(T* ptr, T val) {
32 __sync_synchronize(); // Issue a full barrier, which is an overkill release barrier.
36 #endif//SkBarriers_x86_DEFINED