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/*
* 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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