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1 /*
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2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // If calls to prefetch methods are in a loop, the loop should be cloned
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26 // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
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27 // say not to do prefetching, these methods aren't called. At the very
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28 // least, they take up a memory issue slot. They should be implemented
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29 // as inline assembly code: doing an actual call isn't worth the cost.
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30
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31 class Prefetch : AllStatic {
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32 public:
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33 enum style {
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34 do_none, // Do no prefetching
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35 do_read, // Do read prefetching
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36 do_write // Do write prefetching
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37 };
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38
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39 // Prefetch anticipating read; must not fault, semantically a no-op
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40 static void read(void* loc, intx interval);
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41
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42 // Prefetch anticipating write; must not fault, semantically a no-op
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43 static void write(void* loc, intx interval);
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44 };
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