1 /* 2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // If calls to prefetch methods are in a loop, the loop should be cloned 26 // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval 27 // say not to do prefetching, these methods aren't called. At the very 28 // least, they take up a memory issue slot. They should be implemented 29 // as inline assembly code: doing an actual call isn't worth the cost. 30 31 class Prefetch : AllStatic { 32 public: 33 enum style { 34 do_none, // Do no prefetching 35 do_read, // Do read prefetching 36 do_write // Do write prefetching 37 }; 38 39 // Prefetch anticipating read; must not fault, semantically a no-op 40 static void read(void* loc, intx interval); 41 42 // Prefetch anticipating write; must not fault, semantically a no-op 43 static void write(void* loc, intx interval); 44 };