/*

 * Copyright (c) 1998, 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_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP

#define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP

#pragma warning(disable: 4035) // Disable warning 4035: no return value

// 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

  address p = (address) &x;

  return  ( (u2(p[0]) << 8 ) | ( u2(p[1])) );

#else

  __asm {

    mov ax, x

    xchg al, ah

  }

  // no return statement needed, result is already in ax

  // compiler warning C4035 disabled via warning pragma

#endif // AMD64

}

inline u4 Bytes::swap_u4(u4 x) {

#ifdef AMD64

  address p = (address) &x;

  return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;

#else

  __asm {

    mov eax, x

    bswap eax

  }

  // no return statement needed, result is already in eax

  // compiler warning C4035 disabled via warning pragma

#endif // AMD64

}

#ifdef AMD64

inline u8 Bytes::swap_u8(u8 x) {

  address p = (address) &x;

  return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |

           (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8)  | u8(p[7])) ;

}

#else

// Helper function for swap_u8

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

  __asm {

    mov eax, y

    mov edx, x

    bswap eax

    bswap edx

  }

  // no return statement needed, result is already in edx:eax

  // compiler warning C4035 disabled via warning pragma

}

inline u8 Bytes::swap_u8(u8 x) {

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

}

#endif // AMD64

#pragma warning(default: 4035) // Enable warning 4035: no return value

#endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP