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Diffstat (limited to 'libtransport/includes/hicn/transport/portability/cache.h')
-rw-r--r-- | libtransport/includes/hicn/transport/portability/cache.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/libtransport/includes/hicn/transport/portability/cache.h b/libtransport/includes/hicn/transport/portability/cache.h new file mode 100644 index 000000000..ae113c7d6 --- /dev/null +++ b/libtransport/includes/hicn/transport/portability/cache.h @@ -0,0 +1,87 @@ +/* + * Copyright (c) 2022 Cisco and/or its affiliates. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#pragma once + +#include <hicn/transport/portability/platform.h> + +namespace transport { +namespace portability { +namespace cache { + +/** + * @Prefetch utilities + */ + +/* Default cache line size of 64 bytes. */ +#ifndef LOG2_CACHE_LINE_BYTES +static constexpr const std::size_t klog2_cache_line_bytes = 6; +#else +static constexpr const std::size_t klog2_cache_line_bytes = + LOG2_CACHE_LINE_BYTES; +#endif + +/* How much data prefetch instruction prefetches */ +#ifndef LOG2_CACHE_PREFETCH_BYTES +static constexpr const std::size_t klog2_cache_prefetch_bytes = + klog2_cache_line_bytes; +#else +static constexpr const std::size_t klog2_cache_prefetch_bytes = + LOG2_CACHE_PREFETCH_BYTES; +#endif + +/* Default cache line fill buffers. */ +#ifndef N_PREFETCHES +static constexpr const std::size_t kn_prefetches = 16; +#else +static constexpr const std::size_t kn_prefetches = N_PREFETCHES; +#endif + +static constexpr const std::size_t kcache_line_bytes = + (1 << klog2_cache_line_bytes); +static constexpr const std::size_t kcache_prefetch_bytes = + (1 << klog2_cache_prefetch_bytes); + +static constexpr const int READ = 0; +static constexpr const int LOAD = 0; /* alias for read */ +static constexpr const int WRITE = 1; +static constexpr const int STORE = 1; /* alias for write */ + +#if defined(__GNUC__) || defined(__clang__) +// Clang & GCC + +template <int type> +static inline void _prefetch(uint8_t *addr, std::size_t n, std::size_t size) { + if (size > n * kcache_prefetch_bytes) { + __builtin_prefetch(addr + n * kcache_prefetch_bytes, type, + /* locality */ 3); + } +} + +template <typename T, int type> +static inline void prefetch(T *addr, std::size_t size) { + uint8_t *_addr = reinterpret_cast<uint8_t *>(addr); + + _prefetch<type>(_addr, 0, size); + _prefetch<type>(_addr, 1, size); + _prefetch<type>(_addr, 2, size); + _prefetch<type>(_addr, 3, size); +} +#endif + +} // namespace cache +} // namespace portability +} // namespace transport
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