Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/utilities/copy.cpp
src/share/vm/utilities/copy.cpp
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| 1 /* | |
| 2 * Copyright (c) 2006, 2010, 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 #include "precompiled.hpp" | |
| 26 #include "runtime/sharedRuntime.hpp" | |
| 27 #include "utilities/copy.hpp" | |
| 28 | |
| 29 | |
| 30 // Copy bytes; larger units are filled atomically if everything is aligned. | |
| 31 void Copy::conjoint_memory_atomic(void* from, void* to, size_t size) { | |
| 32 address src = (address) from; | |
| 33 address dst = (address) to; | |
| 34 uintptr_t bits = (uintptr_t) src | (uintptr_t) dst | (uintptr_t) size; | |
| 35 | |
| 36 // (Note: We could improve performance by ignoring the low bits of size, | |
| 37 // and putting a short cleanup loop after each bulk copy loop. | |
| 38 // There are plenty of other ways to make this faster also, | |
| 39 // and it's a slippery slope. For now, let's keep this code simple | |
| 40 // since the simplicity helps clarify the atomicity semantics of | |
| 41 // this operation. There are also CPU-specific assembly versions | |
| 42 // which may or may not want to include such optimizations.) | |
| 43 | |
| 44 if (bits % sizeof(jlong) == 0) { | |
| 45 Copy::conjoint_jlongs_atomic((jlong*) src, (jlong*) dst, size / sizeof(jlong)); | |
| 46 } else if (bits % sizeof(jint) == 0) { | |
| 47 Copy::conjoint_jints_atomic((jint*) src, (jint*) dst, size / sizeof(jint)); | |
| 48 } else if (bits % sizeof(jshort) == 0) { | |
| 49 Copy::conjoint_jshorts_atomic((jshort*) src, (jshort*) dst, size / sizeof(jshort)); | |
| 50 } else { | |
| 51 // Not aligned, so no need to be atomic. | |
| 52 Copy::conjoint_jbytes((void*) src, (void*) dst, size); | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 | |
| 57 // Fill bytes; larger units are filled atomically if everything is aligned. | |
| 58 void Copy::fill_to_memory_atomic(void* to, size_t size, jubyte value) { | |
| 59 address dst = (address) to; | |
| 60 uintptr_t bits = (uintptr_t) to | (uintptr_t) size; | |
| 61 if (bits % sizeof(jlong) == 0) { | |
| 62 jlong fill = (julong)( (jubyte)value ); // zero-extend | |
| 63 if (fill != 0) { | |
| 64 fill += fill << 8; | |
| 65 fill += fill << 16; | |
| 66 fill += fill << 32; | |
| 67 } | |
| 68 //Copy::fill_to_jlongs_atomic((jlong*) dst, size / sizeof(jlong)); | |
| 69 for (uintptr_t off = 0; off < size; off += sizeof(jlong)) { | |
| 70 *(jlong*)(dst + off) = fill; | |
| 71 } | |
| 72 } else if (bits % sizeof(jint) == 0) { | |
| 73 jint fill = (juint)( (jubyte)value ); // zero-extend | |
| 74 if (fill != 0) { | |
| 75 fill += fill << 8; | |
| 76 fill += fill << 16; | |
| 77 } | |
| 78 //Copy::fill_to_jints_atomic((jint*) dst, size / sizeof(jint)); | |
| 79 for (uintptr_t off = 0; off < size; off += sizeof(jint)) { | |
| 80 *(jint*)(dst + off) = fill; | |
| 81 } | |
| 82 } else if (bits % sizeof(jshort) == 0) { | |
| 83 jshort fill = (jushort)( (jubyte)value ); // zero-extend | |
| 84 fill += fill << 8; | |
| 85 //Copy::fill_to_jshorts_atomic((jshort*) dst, size / sizeof(jshort)); | |
| 86 for (uintptr_t off = 0; off < size; off += sizeof(jshort)) { | |
| 87 *(jshort*)(dst + off) = fill; | |
| 88 } | |
| 89 } else { | |
| 90 // Not aligned, so no need to be atomic. | |
| 91 Copy::fill_to_bytes(dst, size, value); | |
| 92 } | |
| 93 } |
