93 lines
3.7 KiB
C++
93 lines
3.7 KiB
C++
|
/*
|
||
|
* Copyright 2006-2007 Sun Microsystems, Inc. All Rights Reserved.
|
||
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
||
|
*
|
||
|
* This code is free software; you can redistribute it and/or modify it
|
||
|
* under the terms of the GNU General Public License version 2 only, as
|
||
|
* published by the Free Software Foundation.
|
||
|
*
|
||
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
||
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
* version 2 for more details (a copy is included in the LICENSE file that
|
||
|
* accompanied this code).
|
||
|
*
|
||
|
* You should have received a copy of the GNU General Public License version
|
||
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
||
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
||
|
*
|
||
|
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
||
|
* CA 95054 USA or visit www.sun.com if you need additional information or
|
||
|
* have any questions.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
# include "incls/_precompiled.incl"
|
||
|
# include "incls/_copy.cpp.incl"
|
||
|
|
||
|
|
||
|
// Copy bytes; larger units are filled atomically if everything is aligned.
|
||
|
void Copy::conjoint_memory_atomic(void* from, void* to, size_t size) {
|
||
|
address src = (address) from;
|
||
|
address dst = (address) to;
|
||
|
uintptr_t bits = (uintptr_t) src | (uintptr_t) dst | (uintptr_t) size;
|
||
|
|
||
|
// (Note: We could improve performance by ignoring the low bits of size,
|
||
|
// and putting a short cleanup loop after each bulk copy loop.
|
||
|
// There are plenty of other ways to make this faster also,
|
||
|
// and it's a slippery slope. For now, let's keep this code simple
|
||
|
// since the simplicity helps clarify the atomicity semantics of
|
||
|
// this operation. There are also CPU-specific assembly versions
|
||
|
// which may or may not want to include such optimizations.)
|
||
|
|
||
|
if (bits % sizeof(jlong) == 0) {
|
||
|
Copy::conjoint_jlongs_atomic((jlong*) src, (jlong*) dst, size / sizeof(jlong));
|
||
|
} else if (bits % sizeof(jint) == 0) {
|
||
|
Copy::conjoint_jints_atomic((jint*) src, (jint*) dst, size / sizeof(jint));
|
||
|
} else if (bits % sizeof(jshort) == 0) {
|
||
|
Copy::conjoint_jshorts_atomic((jshort*) src, (jshort*) dst, size / sizeof(jshort));
|
||
|
} else {
|
||
|
// Not aligned, so no need to be atomic.
|
||
|
Copy::conjoint_bytes((void*) src, (void*) dst, size);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
// Fill bytes; larger units are filled atomically if everything is aligned.
|
||
|
void Copy::fill_to_memory_atomic(void* to, size_t size, jubyte value) {
|
||
|
address dst = (address) to;
|
||
|
uintptr_t bits = (uintptr_t) to | (uintptr_t) size;
|
||
|
if (bits % sizeof(jlong) == 0) {
|
||
|
jlong fill = (julong)( (jubyte)value ); // zero-extend
|
||
|
if (fill != 0) {
|
||
|
fill += fill << 8;
|
||
|
fill += fill << 16;
|
||
|
fill += fill << 32;
|
||
|
}
|
||
|
//Copy::fill_to_jlongs_atomic((jlong*) dst, size / sizeof(jlong));
|
||
|
for (uintptr_t off = 0; off < size; off += sizeof(jlong)) {
|
||
|
*(jlong*)(dst + off) = fill;
|
||
|
}
|
||
|
} else if (bits % sizeof(jint) == 0) {
|
||
|
jint fill = (juint)( (jubyte)value ); // zero-extend
|
||
|
if (fill != 0) {
|
||
|
fill += fill << 8;
|
||
|
fill += fill << 16;
|
||
|
}
|
||
|
//Copy::fill_to_jints_atomic((jint*) dst, size / sizeof(jint));
|
||
|
for (uintptr_t off = 0; off < size; off += sizeof(jint)) {
|
||
|
*(jint*)(dst + off) = fill;
|
||
|
}
|
||
|
} else if (bits % sizeof(jshort) == 0) {
|
||
|
jshort fill = (jushort)( (jubyte)value ); // zero-extend
|
||
|
fill += fill << 8;
|
||
|
//Copy::fill_to_jshorts_atomic((jshort*) dst, size / sizeof(jshort));
|
||
|
for (uintptr_t off = 0; off < size; off += sizeof(jshort)) {
|
||
|
*(jshort*)(dst + off) = fill;
|
||
|
}
|
||
|
} else {
|
||
|
// Not aligned, so no need to be atomic.
|
||
|
Copy::fill_to_bytes(dst, size, value);
|
||
|
}
|
||
|
}
|