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Diffstat (limited to 'include/ports/SkBarriers_x86.h')
-rw-r--r-- | include/ports/SkBarriers_x86.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/include/ports/SkBarriers_x86.h b/include/ports/SkBarriers_x86.h new file mode 100644 index 0000000000..56e2658e97 --- /dev/null +++ b/include/ports/SkBarriers_x86.h @@ -0,0 +1,39 @@ +/* + * Copyright 2014 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef SkBarriers_x86_DEFINED +#define SkBarriers_x86_DEFINED + +#ifdef SK_BUILD_FOR_WIN +# include <intrin.h> +static inline void sk_compiler_barrier() { _ReadWriteBarrier(); } +#else +static inline void sk_compiler_barrier() { asm volatile("" : : : "memory"); } +#endif + +template <typename T> +T sk_acquire_load(T* ptr) { + T val = *ptr; + // On x86, all loads are acquire loads, so we only need a compiler barrier. + sk_compiler_barrier(); + return val; +} + +template <typename T> +T sk_consume_load(T* ptr) { + // On x86, consume is the same as acquire, i.e. a normal load. + return sk_acquire_load(ptr); +} + +template <typename T> +void sk_release_store(T* ptr, T val) { + // On x86, all stores are release stores, so we only need a compiler barrier. + sk_compiler_barrier(); + *ptr = val; +} + +#endif//SkBarriers_x86_DEFINED |