/*

 * Copyright (c) 2003, 2010, 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_VM_COPY_ZERO_HPP

#define CPU_ZERO_VM_COPY_ZERO_HPP

// Inline functions for memory copy and fill.

static void pd_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {

  memmove(to, from, count * HeapWordSize);

}

static void pd_disjoint_words(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(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:

    while (count-- > 0) {

      *to++ = *from++;

    }

    break;

  }

}

static void pd_aligned_conjoint_words(HeapWord* from,

                                      HeapWord* to,

                                      size_t count) {

  memmove(to, from, count * HeapWordSize);

}

static void pd_aligned_disjoint_words(HeapWord* from,

                                      HeapWord* to,

                                      size_t count) {

  pd_disjoint_words(from, to, count);

}

static void pd_conjoint_bytes(void* from, void* to, size_t count) {

  memmove(to, from, count);

}

static void pd_conjoint_bytes_atomic(void* from, void* to, size_t count) {

  memmove(to, from, count);

}

static void pd_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {

  _Copy_conjoint_jshorts_atomic(from, to, count);

}

static void pd_conjoint_jints_atomic(jint* from, jint* to, size_t count) {

  _Copy_conjoint_jints_atomic(from, to, count);

}

static void pd_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {

  _Copy_conjoint_jlongs_atomic(from, to, count);

}

static void pd_conjoint_oops_atomic(oop* from, oop* to, size_t count) {

#ifdef _LP64

  assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");

  _Copy_conjoint_jlongs_atomic((jlong*)from, (jlong*)to, count);

#else

  assert(BytesPerInt == BytesPerOop, "jints and oops must be the same size");

  _Copy_conjoint_jints_atomic((jint*)from, (jint*)to, count);

#endif // _LP64

}

static void pd_arrayof_conjoint_bytes(HeapWord* from,

                                      HeapWord* to,

                                      size_t    count) {

  _Copy_arrayof_conjoint_bytes(from, to, count);

}

static void pd_arrayof_conjoint_jshorts(HeapWord* from,

                                        HeapWord* to,

                                        size_t    count) {

  _Copy_arrayof_conjoint_jshorts(from, to, count);

}

static void pd_arrayof_conjoint_jints(HeapWord* from,

                                      HeapWord* to,

                                      size_t    count) {

  _Copy_arrayof_conjoint_jints(from, to, count);

}

static void pd_arrayof_conjoint_jlongs(HeapWord* from,

                                       HeapWord* to,

                                       size_t    count) {

  _Copy_arrayof_conjoint_jlongs(from, to, count);

}

static void pd_arrayof_conjoint_oops(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_VM_COPY_ZERO_HPP