src/hotspot/share/runtime/prefetch.inline.hpp - master - githubmirror/panama-vector

src/hotspot/share/runtime/prefetch.inline.hpp

48 строк2 KB

jonghoonpark

8372040: Remove Prefetch header vs inline header separation

10 янв 2026, 01:42

10 янв 2026, 01:42805866b

/*
 * Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_RUNTIME_PREFETCH_INLINE_HPP
#define SHARE_RUNTIME_PREFETCH_INLINE_HPP

#include "memory/allStatic.hpp"
#include "utilities/macros.hpp"

// If calls to prefetch methods are in a loop, the loop should be cloned
// such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
// say not to do prefetching, these methods aren't called.  At the very
// least, they take up a memory issue slot.  They should be implemented
// as inline assembly code: doing an actual call isn't worth the cost.

class Prefetch : AllStatic {
 public:
  // Prefetch anticipating read; must not fault, semantically a no-op
  static void read(const void* loc, intx interval);

  // Prefetch anticipating write; must not fault, semantically a no-op
  static void write(void* loc, intx interval);
};

#include OS_CPU_HEADER_INLINE(prefetch)

#endif // SHARE_RUNTIME_PREFETCH_INLINE_HPP