/*

 * Copyright (c) 2014, Red Hat 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#define COPY_SMALL(from, to, count)                                     \

{                                                                       \

        long tmp0, tmp1, tmp2, tmp3;                                    \

        long tmp4, tmp5, tmp6, tmp7;                                    \

  __asm volatile(                                                       \

"       adr     %[t0], 0f;"                                             \

"       add     %[t0], %[t0], %[cnt], lsl #5;"                          \

"       br      %[t0];"                                                 \

"       .align  5;"                                                     \

"0:"                                                                    \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldr     %[t0], [%[s], #0];"                                     \

"       str     %[t0], [%[d], #0];"                                     \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       ldr     %[t2], [%[s], #16];"                                    \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       str     %[t2], [%[d], #16];"                                    \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       ldp     %[t2], %[t3], [%[s], #16];"                             \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       stp     %[t2], %[t3], [%[d], #16];"                             \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       ldp     %[t2], %[t3], [%[s], #16];"                             \

"       ldr     %[t4], [%[s], #32];"                                    \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       stp     %[t2], %[t3], [%[d], #16];"                             \

"       str     %[t4], [%[d], #32];"                                    \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       ldp     %[t2], %[t3], [%[s], #16];"                             \

"       ldp     %[t4], %[t5], [%[s], #32];"                             \

"2:"                                                                    \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       stp     %[t2], %[t3], [%[d], #16];"                             \

"       stp     %[t4], %[t5], [%[d], #32];"                             \

"       b       1f;"                                                    \

"       .align  5;"                                                     \

"       ldr     %[t6], [%[s], #0];"                                     \

"       ldp     %[t0], %[t1], [%[s], #8];"                              \

"       ldp     %[t2], %[t3], [%[s], #24];"                             \

"       ldp     %[t4], %[t5], [%[s], #40];"                             \

"       str     %[t6], [%[d]], #8;"                                     \

"       b       2b;"                                                    \

"       .align  5;"                                                     \

"       ldp     %[t0], %[t1], [%[s], #0];"                              \

"       ldp     %[t2], %[t3], [%[s], #16];"                             \

"       ldp     %[t4], %[t5], [%[s], #32];"                             \

"       ldp     %[t6], %[t7], [%[s], #48];"                             \

"       stp     %[t0], %[t1], [%[d], #0];"                              \

"       stp     %[t2], %[t3], [%[d], #16];"                             \

"       stp     %[t4], %[t5], [%[d], #32];"                             \

"       stp     %[t6], %[t7], [%[d], #48];"                             \

"1:"                                                                    \

                                                                        \

  : [s]"+r"(from), [d]"+r"(to), [cnt]"+r"(count),                       \

    [t0]"=&r"(tmp0), [t1]"=&r"(tmp1), [t2]"=&r"(tmp2), [t3]"=&r"(tmp3), \

    [t4]"=&r"(tmp4), [t5]"=&r"(tmp5), [t6]"=&r"(tmp6), [t7]"=&r"(tmp7)  \

  :                                                                     \

  : "memory", "cc");                                                    \

}

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

  __asm volatile( "prfm pldl1strm, [%[s], #0];" :: [s]"r"(from) : "memory");

  if (__builtin_expect(count <= 8, 1)) {

    COPY_SMALL(from, to, count);

    return;

  }

  _Copy_conjoint_words(from, to, count);

}

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

  if (__builtin_constant_p(count)) {

    memcpy(to, from, count * sizeof(HeapWord));

    return;

  }

  __asm volatile( "prfm pldl1strm, [%[s], #0];" :: [s]"r"(from) : "memory");

  if (__builtin_expect(count <= 8, 1)) {

    COPY_SMALL(from, to, count);

    return;

  }

  _Copy_disjoint_words(from, to, count);

}

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

  __asm volatile( "prfm pldl1strm, [%[s], #0];" :: [s]"r"(from) : "memory");

  if (__builtin_expect(count <= 8, 1)) {

    COPY_SMALL(from, to, count);

    return;

  }

  _Copy_disjoint_words(from, to, count);

}

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

  pd_conjoint_words(from, to, count);

}

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) {

  pd_conjoint_bytes(from, to, 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) {

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

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

}

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) {

  assert(!UseCompressedOops, "foo!");

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

  _Copy_arrayof_conjoint_jlongs(from, to, count);

}