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1 /*
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2 * Copyright 2006-2007 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 # include "incls/_precompiled.incl"
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26 # include "incls/_copy.cpp.incl"
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27
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28
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29 // Copy bytes; larger units are filled atomically if everything is aligned.
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30 void Copy::conjoint_memory_atomic(void* from, void* to, size_t size) {
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31 address src = (address) from;
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32 address dst = (address) to;
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33 uintptr_t bits = (uintptr_t) src | (uintptr_t) dst | (uintptr_t) size;
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34
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35 // (Note: We could improve performance by ignoring the low bits of size,
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36 // and putting a short cleanup loop after each bulk copy loop.
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37 // There are plenty of other ways to make this faster also,
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38 // and it's a slippery slope. For now, let's keep this code simple
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39 // since the simplicity helps clarify the atomicity semantics of
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40 // this operation. There are also CPU-specific assembly versions
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41 // which may or may not want to include such optimizations.)
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42
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43 if (bits % sizeof(jlong) == 0) {
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44 Copy::conjoint_jlongs_atomic((jlong*) src, (jlong*) dst, size / sizeof(jlong));
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45 } else if (bits % sizeof(jint) == 0) {
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46 Copy::conjoint_jints_atomic((jint*) src, (jint*) dst, size / sizeof(jint));
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47 } else if (bits % sizeof(jshort) == 0) {
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48 Copy::conjoint_jshorts_atomic((jshort*) src, (jshort*) dst, size / sizeof(jshort));
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49 } else {
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50 // Not aligned, so no need to be atomic.
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51 Copy::conjoint_bytes((void*) src, (void*) dst, size);
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52 }
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53 }
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54
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55
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56 // Fill bytes; larger units are filled atomically if everything is aligned.
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57 void Copy::fill_to_memory_atomic(void* to, size_t size, jubyte value) {
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58 address dst = (address) to;
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59 uintptr_t bits = (uintptr_t) to | (uintptr_t) size;
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60 if (bits % sizeof(jlong) == 0) {
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61 jlong fill = (julong)( (jubyte)value ); // zero-extend
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62 if (fill != 0) {
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63 fill += fill << 8;
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64 fill += fill << 16;
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65 fill += fill << 32;
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66 }
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67 //Copy::fill_to_jlongs_atomic((jlong*) dst, size / sizeof(jlong));
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68 for (uintptr_t off = 0; off < size; off += sizeof(jlong)) {
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69 *(jlong*)(dst + off) = fill;
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70 }
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71 } else if (bits % sizeof(jint) == 0) {
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72 jint fill = (juint)( (jubyte)value ); // zero-extend
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73 if (fill != 0) {
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74 fill += fill << 8;
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75 fill += fill << 16;
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76 }
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77 //Copy::fill_to_jints_atomic((jint*) dst, size / sizeof(jint));
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78 for (uintptr_t off = 0; off < size; off += sizeof(jint)) {
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79 *(jint*)(dst + off) = fill;
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80 }
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81 } else if (bits % sizeof(jshort) == 0) {
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82 jshort fill = (jushort)( (jubyte)value ); // zero-extend
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83 fill += fill << 8;
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84 //Copy::fill_to_jshorts_atomic((jshort*) dst, size / sizeof(jshort));
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85 for (uintptr_t off = 0; off < size; off += sizeof(jshort)) {
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86 *(jshort*)(dst + off) = fill;
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87 }
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88 } else {
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89 // Not aligned, so no need to be atomic.
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90 Copy::fill_to_bytes(dst, size, value);
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91 }
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92 }
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