| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef QUICHE_QUIC_PLATFORM_API_QUIC_PREFETCH_H_ |
| #define QUICHE_QUIC_PLATFORM_API_QUIC_PREFETCH_H_ |
| |
| #include "net/quic/platform/impl/quic_prefetch_impl.h" |
| |
| namespace quic { |
| |
| // Move data into the cache before it is read, or "prefetch" it. |
| // |
| // The value of `addr` is the address of the memory to prefetch. If |
| // the target and compiler support it, data prefetch instructions are |
| // generated. If the prefetch is done some time before the memory is |
| // read, it may be in the cache by the time the read occurs. |
| // |
| // The function names specify the temporal locality heuristic applied, |
| // using the names of Intel prefetch instructions: |
| // |
| // T0 - high degree of temporal locality; data should be left in as |
| // many levels of the cache possible |
| // T1 - moderate degree of temporal locality |
| // T2 - low degree of temporal locality |
| // Nta - no temporal locality, data need not be left in the cache |
| // after the read |
| // |
| // Incorrect or gratuitous use of these functions can degrade |
| // performance, so use them only when representative benchmarks show |
| // an improvement. |
| |
| inline void QuicPrefetchT0(const void* addr) { |
| return QuicPrefetchT0Impl(addr); |
| } |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_PLATFORM_API_QUIC_PREFETCH_H_ |
