1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkBarriers_x86_DEFINED 9 #define SkBarriers_x86_DEFINED 10 11 #ifdef SK_BUILD_FOR_WIN 12 # include <intrin.h> 13 static inline void sk_compiler_barrier() { _ReadWriteBarrier(); } 14 #else 15 static inline void sk_compiler_barrier() { asm volatile("" : : : "memory"); } 16 #endif 17 18 template <typename T> 19 T sk_acquire_load(T* ptr) { 20 T val = *ptr; 21 // On x86, all loads are acquire loads, so we only need a compiler barrier. 22 sk_compiler_barrier(); 23 return val; 24 } 25 26 template <typename T> 27 T sk_consume_load(T* ptr) { 28 // On x86, consume is the same as acquire, i.e. a normal load. 29 return sk_acquire_load(ptr); 30 } 31 32 template <typename T> 33 void sk_release_store(T* ptr, T val) { 34 // On x86, all stores are release stores, so we only need a compiler barrier. 35 sk_compiler_barrier(); 36 *ptr = val; 37 } 38 39 #endif//SkBarriers_x86_DEFINED 40
