/*

 * Copyright 2003-2008 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.

 *

 */

// Inline functions for memory copy and fill.

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

  (void)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: (void)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) {

  (void)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) {

  (void)memmove(to, from, count);

}

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

  (void)memmove(to, from, count);

}

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

  // FIXME

  (void)memmove(to, from, count << LogBytesPerShort);

}

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

  // FIXME

  (void)memmove(to, from, count << LogBytesPerInt);

}

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

#ifdef _LP64

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

  pd_conjoint_oops_atomic((oop*)from, (oop*)to, count);

#else

  // Guarantee use of ldd/std via some asm code, because compiler won't.

  // See solaris_sparc.il.

  _Copy_conjoint_jlongs_atomic(from, to, count);

#endif

}

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

  // Do better than this: inline memmove body  NEEDS CLEANUP

  if (from > to) {

    while (count-- > 0) {

      // Copy forwards

      *to++ = *from++;

    }

  } else {

    from += count - 1;

    to   += count - 1;

    while (count-- > 0) {

      // Copy backwards

      *to-- = *from--;

    }

  }

}

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

  pd_conjoint_bytes_atomic(from, to, count);

}

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

  pd_conjoint_jshorts_atomic((jshort*)from, (jshort*)to, count);

}

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

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

}

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

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

}

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

  pd_conjoint_oops_atomic((oop*)from, (oop*)to, count);

}

static void pd_fill_to_words(HeapWord* tohw, size_t count, juint value) {

#ifdef _LP64

  guarantee(mask_bits((uintptr_t)tohw, right_n_bits(LogBytesPerLong)) == 0,

         "unaligned fill words");

  julong* to = (julong*)tohw;

  julong  v  = ((julong)value << 32) | value;

  while (count-- > 0) {

    *to++ = v;

  }

#else // _LP64

  juint* to = (juint*)tohw;

  while (count-- > 0) {

    *to++ = value;

  }

#endif // _LP64

}

static void pd_fill_to_aligned_words(HeapWord* tohw, size_t count, juint value) {

  assert(MinObjAlignmentInBytes == BytesPerLong, "need alternate implementation");

   julong* to = (julong*)tohw;

   julong  v  = ((julong)value << 32) | value;

   // If count is odd, odd will be equal to 1 on 32-bit platform

   // and be equal to 0 on 64-bit platform.

   size_t odd = count % (BytesPerLong / HeapWordSize) ;

   size_t aligned_count = align_object_size(count - odd) / HeapWordsPerLong;

   julong* end = ((julong*)tohw) + aligned_count - 1;

   while (to <= end) {

     DEBUG_ONLY(count -= BytesPerLong / HeapWordSize ;)

     *to++ = v;

   }

   assert(count == odd, "bad bounds on loop filling to aligned words");

   if (odd) {

     *((juint*)to) = value;

   }

}

static void pd_fill_to_bytes(void* to, size_t count, jubyte value) {

  (void)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) {

  (void)memset(to, 0, count);

}