/*

 * Copyright 1998-2007 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.

 *

 */

// For Sun Studio - implementation is in solaris_i486.il.

// For gcc - implementation is just below.

extern "C" u2 _raw_swap_u2(u2 x);

extern "C" u4 _raw_swap_u4(u4 x);

#ifdef AMD64

extern "C" u8 _raw_swap_u8(u8 x);

#else

extern "C" u8 _raw_swap_u8(u4 x, u4 y);

#endif // AMD64

// Efficient swapping of data bytes from Java byte

// ordering to native byte ordering and vice versa.

inline u2   Bytes::swap_u2(u2 x) {

  return _raw_swap_u2(x);

}

inline u4   Bytes::swap_u4(u4 x) {

  return _raw_swap_u4(x);

}

inline u8   Bytes::swap_u8(u8 x) {

#ifdef AMD64

  return _raw_swap_u8(x);

#else

  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));

#endif // AMD64

}

#ifndef AMD64

// Helper function for swap_u8

inline u8   Bytes::swap_u8_base(u4 x, u4 y) {

  return _raw_swap_u8(x, y);

}

#endif // !AMD64

#ifdef _GNU_SOURCE

extern "C" {

#ifdef AMD64

  inline u2 _raw_swap_u2(u2 x) {

    register unsigned short int __dest;

    __asm__ ("rorw $8, %w0": "=r" (__dest): "0" (x): "cc");

    return __dest;

  }

  inline u4 _raw_swap_u4(u4 x) {

    register unsigned int __dest;

    __asm__ ("bswap %0" : "=r" (__dest) : "0" (x));

    return __dest;

  }

  inline u8 _raw_swap_u8(u8 x) {

    register unsigned long  __dest;

    __asm__ ("bswap %q0" : "=r" (__dest) : "0" (x));

    return __dest;

  }

#else

  inline u2 _raw_swap_u2(u2 x) {

    u2 ret;

    __asm__ __volatile__ (

      "movw %0, %%ax;"

      "xchg %%al, %%ah;"

      "movw %%ax, %0"

      :"=r" (ret)      // output : register 0 => ret

      :"0"  (x)        // input  : x => register 0

      :"ax", "0"       // clobbered registers

    );

    return ret;

  }

  inline u4 _raw_swap_u4(u4 x) {

    u4 ret;

    __asm__ __volatile__ (

      "bswap %0"

      :"=r" (ret)      // output : register 0 => ret

      :"0"  (x)        // input  : x => register 0

      :"0"             // clobbered register

    );

    return ret;

  }

  inline u8 _raw_swap_u8(u4 x, u4 y) {

    return (((u8)_raw_swap_u4(x))<<32) | _raw_swap_u4(y);

  }

#endif // AMD64

}

#endif  //_GNU_SOURCE