/*

 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. 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.

 *

 */

#ifndef OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP

#define OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP

#include <byteswap.h>

// Efficient swapping of data bytes from Java byte

// ordering to native byte ordering and vice versa.

inline u2   Bytes::swap_u2(u2 x) {

#ifdef AMD64

  return bswap_16(x);

#else

  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;

#endif // AMD64

}

inline u4   Bytes::swap_u4(u4 x) {

#ifdef AMD64

  return bswap_32(x);

#else

  u4 ret;

  __asm__ __volatile__ (

    "bswap %0"

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

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

    :"0"             // clobbered register

  );

  return ret;

#endif // AMD64

}

#ifdef AMD64

inline u8 Bytes::swap_u8(u8 x) {

#ifdef SPARC_WORKS

  // workaround for SunStudio12 CR6615391

  __asm__ __volatile__ (

    "bswapq %0"

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

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

    :"0"             // clobbered register

  );

  return x;

#else

  return bswap_64(x);

#endif

}

#else

// Helper function for swap_u8

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

  return (((u8)swap_u4(x))<<32) | swap_u4(y);

}

inline u8 Bytes::swap_u8(u8 x) {

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

}

#endif // !AMD64

#endif // OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP