copy_ppc.hpp

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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef CPU_PPC_COPY_PPC_HPP
#define CPU_PPC_COPY_PPC_HPP

#ifndef PPC64
#error "copy currently only implemented for PPC64"
#endif

// Inline functions for memory copy and fill.

static void pd_conjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
  (void)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: (void)memcpy(to, from, count * HeapWordSize);
           break;
  }
}

static void pd_disjoint_words_atomic(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: while (count-- > 0) {
             *to++ = *from++;
           }
           break;
  }
}

static void pd_aligned_conjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
  (void)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) {
  (void)memmove(to, from, count);
}

static void pd_conjoint_bytes_atomic(const void* from, void* to, size_t count) {
  (void)memmove(to, from, count);
}

// Template for atomic, element-wise copy.
template <class T>
static void copy_conjoint_atomic(const T* from, T* to, size_t count) {
  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_conjoint_jshorts_atomic(const jshort* from, jshort* to, size_t count) {
  // TODO: contribute optimized version.
  copy_conjoint_atomic<jshort>(from, to, count);
}

static void pd_conjoint_jints_atomic(const jint* from, jint* to, size_t count) {
  // TODO: contribute optimized version.
  copy_conjoint_atomic<jint>(from, to, count);
}

static void pd_conjoint_jlongs_atomic(const jlong* from, jlong* to, size_t count) {
  copy_conjoint_atomic<jlong>(from, to, count);
}

static void pd_conjoint_oops_atomic(const oop* from, oop* to, size_t count) {
  copy_conjoint_atomic<oop>(from, to, count);
}

static void pd_arrayof_conjoint_bytes(const HeapWord* from, HeapWord* to, size_t count) {
  pd_conjoint_bytes_atomic(from, to, count);
}

static void pd_arrayof_conjoint_jshorts(const HeapWord* from, HeapWord* to, size_t count) {
  // TODO: contribute optimized version.
  pd_conjoint_jshorts_atomic((const jshort*)from, (jshort*)to, count);
}

static void pd_arrayof_conjoint_jints(const HeapWord* from, HeapWord* to, size_t count) {
  // TODO: contribute optimized version.
  pd_conjoint_jints_atomic((const jint*)from, (jint*)to, count);
}

static void pd_arrayof_conjoint_jlongs(const HeapWord* from, HeapWord* to, size_t count) {
  pd_conjoint_jlongs_atomic((const jlong*)from, (jlong*)to, count);
}

static void pd_arrayof_conjoint_oops(const HeapWord* from, HeapWord* to, size_t count) {
  pd_conjoint_oops_atomic((const oop*)from, (oop*)to, count);
}

static void pd_fill_to_words(HeapWord* tohw, size_t count, juint value) {
  julong* to = (julong*)tohw;
  julong  v  = ((julong)value << 32) | value;
  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) {
  (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);
}

#endif // CPU_PPC_COPY_PPC_HPP