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 /*

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  * Copyright 2012, 2013 SAP AG. 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

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  */

 #ifndef CPU_PPC_VM_BYTES_PPC_HPP

 #define CPU_PPC_VM_BYTES_PPC_HPP

 #include "memory/allocation.hpp"

 class Bytes: AllStatic {

  public:

   // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering

   // PowerPC needs to check for alignment.

   // can I count on address always being a pointer to an unsigned char? Yes

   // Returns true, if the byte ordering used by Java is different from the nativ byte ordering

   // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.

   static inline bool is_Java_byte_ordering_different() { return false; }

   // Thus, a swap between native and Java ordering is always a no-op:

   static inline u2   swap_u2(u2 x)  { return x; }

   static inline u4   swap_u4(u4 x)  { return x; }

   static inline u8   swap_u8(u8 x)  { return x; }

   static inline u2   get_native_u2(address p) {

     return (intptr_t(p) & 1) == 0

              ?   *(u2*)p

              :   ( u2(p[0]) << 8 )

                | ( u2(p[1])      );

   }

   static inline u4   get_native_u4(address p) {

     switch (intptr_t(p) & 3) {

      case 0:  return *(u4*)p;

      case 2:  return (  u4( ((u2*)p)[0] ) << 16  )

                    | (  u4( ((u2*)p)[1] )        );

     default:  return ( u4(p[0]) << 24 )

                    | ( u4(p[1]) << 16 )

                    | ( u4(p[2]) <<  8 )

                    |   u4(p[3]);

     }

   }

   static inline u8   get_native_u8(address p) {

     switch (intptr_t(p) & 7) {

       case 0:  return *(u8*)p;

       case 4:  return (  u8( ((u4*)p)[0] ) << 32  )

                     | (  u8( ((u4*)p)[1] )        );

       case 2:  return (  u8( ((u2*)p)[0] ) << 48  )

                     | (  u8( ((u2*)p)[1] ) << 32  )

                     | (  u8( ((u2*)p)[2] ) << 16  )

                     | (  u8( ((u2*)p)[3] )        );

      default:  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]);

     }

   }

   static inline void put_native_u2(address p, u2 x) {

     if ( (intptr_t(p) & 1) == 0 ) { *(u2*)p = x; }

     else {

       p[0] = x >> 8;

       p[1] = x;

     }

   }

   static inline void put_native_u4(address p, u4 x) {

     switch ( intptr_t(p) & 3 ) {

     case 0:  *(u4*)p = x;

               break;

     case 2:  ((u2*)p)[0] = x >> 16;

              ((u2*)p)[1] = x;

              break;

     default: ((u1*)p)[0] = x >> 24;

              ((u1*)p)[1] = x >> 16;

              ((u1*)p)[2] = x >>  8;

              ((u1*)p)[3] = x;

              break;

     }

   }

   static inline void put_native_u8(address p, u8 x) {

     switch ( intptr_t(p) & 7 ) {

     case 0:  *(u8*)p = x;

              break;

     case 4:  ((u4*)p)[0] = x >> 32;

              ((u4*)p)[1] = x;

              break;

     case 2:  ((u2*)p)[0] = x >> 48;

              ((u2*)p)[1] = x >> 32;

              ((u2*)p)[2] = x >> 16;

              ((u2*)p)[3] = x;

              break;

     default: ((u1*)p)[0] = x >> 56;

              ((u1*)p)[1] = x >> 48;

              ((u1*)p)[2] = x >> 40;

              ((u1*)p)[3] = x >> 32;

              ((u1*)p)[4] = x >> 24;

              ((u1*)p)[5] = x >> 16;

              ((u1*)p)[6] = x >>  8;

              ((u1*)p)[7] = x;

     }

   }

   // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)

   // (no byte-order reversal is needed since Power CPUs are big-endian oriented).

   static inline u2   get_Java_u2(address p) { return get_native_u2(p); }

   static inline u4   get_Java_u4(address p) { return get_native_u4(p); }

   static inline u8   get_Java_u8(address p) { return get_native_u8(p); }

   static inline void put_Java_u2(address p, u2 x)     { put_native_u2(p, x); }

   static inline void put_Java_u4(address p, u4 x)     { put_native_u4(p, x); }

   static inline void put_Java_u8(address p, u8 x)     { put_native_u8(p, x); }

 };

 #endif // CPU_PPC_VM_BYTES_PPC_HPP