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159 lines
5.7 KiB
C
159 lines
5.7 KiB
C
// CPU Byte Order Utilities
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// Game_Music_Emu 0.5.2
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#ifndef BLARGG_ENDIAN
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#define BLARGG_ENDIAN
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#include "blargg_common.h"
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// BLARGG_CPU_CISC: Defined if CPU has very few general-purpose registers (< 16)
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#if defined (_M_IX86) || defined (_M_IA64) || defined (__i486__) || \
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defined (__x86_64__) || defined (__ia64__) || defined (__i386__)
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#define BLARGG_CPU_X86 1
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#define BLARGG_CPU_CISC 1
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#endif
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#if defined (__powerpc__) || defined (__ppc__) || defined (__POWERPC__) || defined (__powerc)
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#define BLARGG_CPU_POWERPC 1
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#endif
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// BLARGG_BIG_ENDIAN, BLARGG_LITTLE_ENDIAN: Determined automatically, otherwise only
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// one may be #defined to 1. Only needed if something actually depends on byte order.
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#if !defined (BLARGG_BIG_ENDIAN) && !defined (BLARGG_LITTLE_ENDIAN)
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#ifdef __GLIBC__
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// GCC handles this for us
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#include <endian.h>
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define BLARGG_LITTLE_ENDIAN 1
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define BLARGG_BIG_ENDIAN 1
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#endif
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#else
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#if !defined(MSB_FIRST) || defined (__LITTLE_ENDIAN__) || BLARGG_CPU_X86 || \
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(defined (LITTLE_ENDIAN) && LITTLE_ENDIAN+0 != 1234)
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#define BLARGG_LITTLE_ENDIAN 1
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#endif
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#if defined (MSB_FIRST) || defined (__BIG_ENDIAN__) || defined (WORDS_BIGENDIAN) || \
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defined (__mips__) || defined (__sparc__) || BLARGG_CPU_POWERPC || \
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(defined (BIG_ENDIAN) && BIG_ENDIAN+0 != 4321)
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#define BLARGG_BIG_ENDIAN 1
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#else
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// No endian specified; assume little-endian, since it's most common
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#define BLARGG_LITTLE_ENDIAN 1
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#endif
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#endif
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#endif
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#if BLARGG_LITTLE_ENDIAN && BLARGG_BIG_ENDIAN
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#undef BLARGG_LITTLE_ENDIAN
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#undef BLARGG_BIG_ENDIAN
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#endif
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inline void blargg_verify_byte_order()
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{
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#ifndef NDEBUG
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#if BLARGG_BIG_ENDIAN
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volatile int i = 1;
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assert( *(volatile char*) &i == 0 );
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#elif BLARGG_LITTLE_ENDIAN
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volatile int i = 1;
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assert( *(volatile char*) &i != 0 );
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#endif
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#endif
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}
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inline unsigned get_le16( void const* p ) {
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return ((unsigned char const*) p) [1] * 0x100u +
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((unsigned char const*) p) [0];
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}
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inline unsigned get_be16( void const* p ) {
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return ((unsigned char const*) p) [0] * 0x100u +
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((unsigned char const*) p) [1];
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}
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inline blargg_ulong get_le32( void const* p ) {
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return ((unsigned char const*) p) [3] * 0x01000000u +
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((unsigned char const*) p) [2] * 0x00010000u +
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((unsigned char const*) p) [1] * 0x00000100u +
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((unsigned char const*) p) [0];
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}
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inline blargg_ulong get_be32( void const* p ) {
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return ((unsigned char const*) p) [0] * 0x01000000u +
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((unsigned char const*) p) [1] * 0x00010000u +
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((unsigned char const*) p) [2] * 0x00000100u +
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((unsigned char const*) p) [3];
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}
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inline void set_le16( void* p, unsigned n ) {
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((unsigned char*) p) [1] = (unsigned char) (n >> 8);
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((unsigned char*) p) [0] = (unsigned char) n;
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}
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inline void set_be16( void* p, unsigned n ) {
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((unsigned char*) p) [0] = (unsigned char) (n >> 8);
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((unsigned char*) p) [1] = (unsigned char) n;
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}
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inline void set_le32( void* p, blargg_ulong n ) {
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((unsigned char*) p) [3] = (unsigned char) (n >> 24);
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((unsigned char*) p) [2] = (unsigned char) (n >> 16);
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((unsigned char*) p) [1] = (unsigned char) (n >> 8);
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((unsigned char*) p) [0] = (unsigned char) n;
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}
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inline void set_be32( void* p, blargg_ulong n ) {
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((unsigned char*) p) [0] = (unsigned char) (n >> 24);
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((unsigned char*) p) [1] = (unsigned char) (n >> 16);
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((unsigned char*) p) [2] = (unsigned char) (n >> 8);
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((unsigned char*) p) [3] = (unsigned char) n;
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}
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#if BLARGG_NONPORTABLE
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// Optimized implementation if byte order is known
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#if BLARGG_LITTLE_ENDIAN
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#define GET_LE16( addr ) (*(BOOST::uint16_t*) (addr))
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#define GET_LE32( addr ) (*(BOOST::uint32_t*) (addr))
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#define SET_LE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
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#define SET_LE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
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#elif BLARGG_BIG_ENDIAN
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#define GET_BE16( addr ) (*(BOOST::uint16_t*) (addr))
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#define GET_BE32( addr ) (*(BOOST::uint32_t*) (addr))
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#define SET_BE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
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#define SET_BE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
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#endif
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#if BLARGG_CPU_POWERPC && defined (__MWERKS__)
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// PowerPC has special byte-reversed instructions
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// to do: assumes that PowerPC is running in big-endian mode
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// to do: implement for other compilers which don't support these macros
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#define GET_LE16( addr ) (__lhbrx( (addr), 0 ))
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#define GET_LE32( addr ) (__lwbrx( (addr), 0 ))
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#define SET_LE16( addr, data ) (__sthbrx( (data), (addr), 0 ))
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#define SET_LE32( addr, data ) (__stwbrx( (data), (addr), 0 ))
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#endif
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#endif
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#ifndef GET_LE16
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#define GET_LE16( addr ) get_le16( addr )
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#define GET_LE32( addr ) get_le32( addr )
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#define SET_LE16( addr, data ) set_le16( addr, data )
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#define SET_LE32( addr, data ) set_le32( addr, data )
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#endif
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#ifndef GET_BE16
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#define GET_BE16( addr ) get_be16( addr )
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#define GET_BE32( addr ) get_be32( addr )
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#define SET_BE16( addr, data ) set_be16( addr, data )
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#define SET_BE32( addr, data ) set_be32( addr, data )
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#endif
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// auto-selecting versions
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inline void set_le( BOOST::uint16_t* p, unsigned n ) { SET_LE16( p, n ); }
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inline void set_le( BOOST::uint32_t* p, blargg_ulong n ) { SET_LE32( p, n ); }
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inline void set_be( BOOST::uint16_t* p, unsigned n ) { SET_BE16( p, n ); }
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inline void set_be( BOOST::uint32_t* p, blargg_ulong n ) { SET_BE32( p, n ); }
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inline unsigned get_le( BOOST::uint16_t* p ) { return GET_LE16( p ); }
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inline blargg_ulong get_le( BOOST::uint32_t* p ) { return GET_LE32( p ); }
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inline unsigned get_be( BOOST::uint16_t* p ) { return GET_BE16( p ); }
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inline blargg_ulong get_be( BOOST::uint32_t* p ) { return GET_BE32( p ); }
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#endif
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