45 lines
1.8 KiB
C++
45 lines
1.8 KiB
C++
/*
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* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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// If calls to prefetch methods are in a loop, the loop should be cloned
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// such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
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// say not to do prefetching, these methods aren't called. At the very
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// least, they take up a memory issue slot. They should be implemented
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// as inline assembly code: doing an actual call isn't worth the cost.
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class Prefetch : AllStatic {
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public:
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enum style {
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do_none, // Do no prefetching
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do_read, // Do read prefetching
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do_write // Do write prefetching
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};
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// Prefetch anticipating read; must not fault, semantically a no-op
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static void read(void* loc, intx interval);
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// Prefetch anticipating write; must not fault, semantically a no-op
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static void write(void* loc, intx interval);
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};
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