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/*
* Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright 2007 Red Hat, Inc.
* 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef CPU_ZERO_COPY_ZERO_HPP
#define CPU_ZERO_COPY_ZERO_HPP
// Inline functions for memory copy and fill.
static void pd_conjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
memmove(to, from, count * HeapWordSize);
}
static void pd_disjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
switch (count) {
case 8: to[7] = from[7];
case 7: to[6] = from[6];
case 6: to[5] = from[5];
case 5: to[4] = from[4];
case 4: to[3] = from[3];
case 3: to[2] = from[2];
case 2: to[1] = from[1];
case 1: to[0] = from[0];
case 0: break;
default:
memcpy(to, from, count * HeapWordSize);
break;
}
}
static void pd_disjoint_words_atomic(const HeapWord* from,
HeapWord* to,
size_t count) {
shared_disjoint_words_atomic(from, to, count);
}
static void pd_aligned_conjoint_words(const HeapWord* from,
HeapWord* to,
size_t count) {
memmove(to, from, count * HeapWordSize);
}
static void pd_aligned_disjoint_words(const HeapWord* from,
HeapWord* to,
size_t count) {
pd_disjoint_words(from, to, count);
}
static void pd_conjoint_bytes(const void* from, void* to, size_t count) {
memmove(to, from, count);
}
static void pd_conjoint_bytes_atomic(const void* from, void* to, size_t count) {
memmove(to, from, count);
}
static void pd_conjoint_jshorts_atomic(const jshort* from, jshort* to, size_t count) {
_Copy_conjoint_jshorts_atomic(from, to, count);
}
static void pd_conjoint_jints_atomic(const jint* from, jint* to, size_t count) {
_Copy_conjoint_jints_atomic(from, to, count);
}
static void pd_conjoint_jlongs_atomic(const jlong* from, jlong* to, size_t count) {
_Copy_conjoint_jlongs_atomic(from, to, count);
}
static void pd_conjoint_oops_atomic(const oop* from, oop* to, size_t count) {
#ifdef _LP64
assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
_Copy_conjoint_jlongs_atomic((const jlong*)from, (jlong*)to, count);
#else
assert(BytesPerInt == BytesPerOop, "jints and oops must be the same size");
_Copy_conjoint_jints_atomic((const jint*)from, (jint*)to, count);
#endif // _LP64
}
static void pd_arrayof_conjoint_bytes(const HeapWord* from,
HeapWord* to,
size_t count) {
_Copy_arrayof_conjoint_bytes(from, to, count);
}
static void pd_arrayof_conjoint_jshorts(const HeapWord* from,
HeapWord* to,
size_t count) {
_Copy_arrayof_conjoint_jshorts(from, to, count);
}
static void pd_arrayof_conjoint_jints(const HeapWord* from,
HeapWord* to,
size_t count) {
_Copy_arrayof_conjoint_jints(from, to, count);
}
static void pd_arrayof_conjoint_jlongs(const HeapWord* from,
HeapWord* to,
size_t count) {
_Copy_arrayof_conjoint_jlongs(from, to, count);
}
static void pd_arrayof_conjoint_oops(const HeapWord* from,
HeapWord* to,
size_t count) {
#ifdef _LP64
assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
_Copy_arrayof_conjoint_jlongs(from, to, count);
#else
assert(BytesPerInt == BytesPerOop, "jints and oops must be the same size");
_Copy_arrayof_conjoint_jints(from, to, count);
#endif // _LP64
}
static void pd_fill_to_words(HeapWord* tohw, size_t count, juint value) {
#ifdef _LP64
julong* to = (julong*) tohw;
julong v = ((julong) value << 32) | value;
#else
juint* to = (juint*) tohw;
juint v = value;
#endif // _LP64
while (count-- > 0) {
*to++ = v;
}
}
static void pd_fill_to_aligned_words(HeapWord* tohw,
size_t count,
juint value) {
pd_fill_to_words(tohw, count, value);
}
static void pd_fill_to_bytes(void* to, size_t count, jubyte value) {
memset(to, value, count);
}
static void pd_zero_to_words(HeapWord* tohw, size_t count) {
pd_fill_to_words(tohw, count, 0);
}
static void pd_zero_to_bytes(void* to, size_t count) {
memset(to, 0, count);
}
#endif // CPU_ZERO_COPY_ZERO_HPP
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