hotspot/src/os_cpu/windows_x86/vm/copy_windows_x86.inline.hpp
author twisti
Fri, 30 Nov 2012 15:23:16 -0800
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8003240: x86: move MacroAssembler into separate file Reviewed-by: kvn
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/*
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 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef OS_CPU_WINDOWS_X86_VM_COPY_WINDOWS_X86_INLINE_HPP
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#define OS_CPU_WINDOWS_X86_VM_COPY_WINDOWS_X86_INLINE_HPP
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static void pd_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
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  (void)memmove(to, from, count * HeapWordSize);
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}
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static void pd_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
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#ifdef AMD64
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  switch (count) {
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  case 8:  to[7] = from[7];
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  case 7:  to[6] = from[6];
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  case 6:  to[5] = from[5];
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  case 5:  to[4] = from[4];
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  case 4:  to[3] = from[3];
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  case 3:  to[2] = from[2];
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  case 2:  to[1] = from[1];
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  case 1:  to[0] = from[0];
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  case 0:  break;
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  default:
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    (void)memcpy(to, from, count * HeapWordSize);
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    break;
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  }
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#else
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  (void)memcpy(to, from, count * HeapWordSize);
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#endif // AMD64
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}
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static void pd_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) {
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  switch (count) {
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  case 8:  to[7] = from[7];
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  case 7:  to[6] = from[6];
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  case 6:  to[5] = from[5];
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  case 5:  to[4] = from[4];
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  case 4:  to[3] = from[3];
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  case 3:  to[2] = from[2];
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  case 2:  to[1] = from[1];
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  case 1:  to[0] = from[0];
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  case 0:  break;
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  default: while (count-- > 0) {
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             *to++ = *from++;
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           }
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           break;
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  }
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}
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static void pd_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
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  (void)memmove(to, from, count * HeapWordSize);
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}
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static void pd_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
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  pd_disjoint_words(from, to, count);
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}
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static void pd_conjoint_bytes(void* from, void* to, size_t count) {
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  (void)memmove(to, from, count);
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}
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static void pd_conjoint_bytes_atomic(void* from, void* to, size_t count) {
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  pd_conjoint_bytes(from, to, count);
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}
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static void pd_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
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  if (from > to) {
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    while (count-- > 0) {
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      // Copy forwards
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      *to++ = *from++;
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    }
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  } else {
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    from += count - 1;
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    to   += count - 1;
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    while (count-- > 0) {
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      // Copy backwards
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      *to-- = *from--;
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    }
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  }
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}
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static void pd_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
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  if (from > to) {
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    while (count-- > 0) {
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      // Copy forwards
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      *to++ = *from++;
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    }
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  } else {
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    from += count - 1;
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    to   += count - 1;
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    while (count-- > 0) {
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      // Copy backwards
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      *to-- = *from--;
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    }
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  }
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}
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static void pd_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
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#ifdef AMD64
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  assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
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  pd_conjoint_oops_atomic((oop*)from, (oop*)to, count);
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#else
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  // Guarantee use of fild/fistp or xmm regs via some asm code, because compilers won't.
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  __asm {
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    mov    eax, from;
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    mov    edx, to;
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    mov    ecx, count;
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    cmp    eax, edx;
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    jbe    downtest;
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    jmp    uptest;
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  up:
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    fild   qword ptr [eax];
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    fistp  qword ptr [edx];
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    add    eax, 8;
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    add    edx, 8;
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  uptest:
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    sub    ecx, 1;
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    jge    up;
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    jmp    done;
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  down:
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    fild   qword ptr [eax][ecx*8];
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    fistp  qword ptr [edx][ecx*8];
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  downtest:
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    sub    ecx, 1;
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    jge    down;
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  done:;
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  }
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#endif // AMD64
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}
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static void pd_conjoint_oops_atomic(oop* from, oop* to, size_t count) {
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  // Do better than this: inline memmove body  NEEDS CLEANUP
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  if (from > to) {
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    while (count-- > 0) {
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      // Copy forwards
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      *to++ = *from++;
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    }
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  } else {
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    from += count - 1;
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    to   += count - 1;
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    while (count-- > 0) {
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      // Copy backwards
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      *to-- = *from--;
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    }
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  }
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}
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static void pd_arrayof_conjoint_bytes(HeapWord* from, HeapWord* to, size_t count) {
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#ifdef AMD64
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  pd_conjoint_bytes_atomic(from, to, count);
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#else
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  pd_conjoint_bytes(from, to, count);
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#endif // AMD64
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}
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static void pd_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) {
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  pd_conjoint_jshorts_atomic((jshort*)from, (jshort*)to, count);
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}
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static void pd_arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) {
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  pd_conjoint_jints_atomic((jint*)from, (jint*)to, count);
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}
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static void pd_arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) {
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  pd_conjoint_jlongs_atomic((jlong*)from, (jlong*)to, count);
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}
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static void pd_arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) {
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  pd_conjoint_oops_atomic((oop*)from, (oop*)to, count);
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}
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#endif // OS_CPU_WINDOWS_X86_VM_COPY_WINDOWS_X86_INLINE_HPP