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