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#ifndef __BSWAP_H__
# define __BSWAP_H__
# ifdef HAVE_BYTESWAP_H
# include <byteswap.h>
# else
# include <inttypes.h>
# ifdef ARCH_X86_64
# define LEGACY_REGS "=Q"
# else
# define LEGACY_REGS "=q"
# endif
# if defined(ARCH_X86) || defined(ARCH_X86_64)
static inline uint16_t
ByteSwap16(uint16_t x)
{
__asm("xchgb %b0,%h0":
LEGACY_REGS(x):
"0"(x));
return x;
}
# define bswap_16(x) ByteSwap16(x)
static inline uint32_t
ByteSwap32(uint32_t x)
{
# if __CPU__ > 386
__asm("bswap %0":
"=r"(x):
# else
__asm("xchgb %b0,%h0\n" " rorl $16,%0\n" " xchgb %b0,%h0":
LEGACY_REGS(x):
# endif
"0"(x));
return x;
}
# define bswap_32(x) ByteSwap32(x)
static inline uint64_t
ByteSwap64(uint64_t x)
{
# ifdef ARCH_X86_64
__asm("bswap %0":
"=r"(x):
"0"(x));
return x;
# else
register union
{
__extension__ uint64_t __ll;
uint32_t __l[2];
} __x;
asm("xchgl %0,%1":
"=r"(__x.__l[0]), "=r"(__x.__l[1]):
"0"(bswap_32((unsigned long) x)), "1"(bswap_32((unsigned long) (x >> 32))));
return __x.__ll;
# endif
}
# define bswap_64(x) ByteSwap64(x)
# elif defined(ARCH_SH4)
static inline uint16_t
ByteSwap16(uint16_t x)
{
__asm__("swap.b %0,%0": "=r"(x):"0"(x));
return x;
}
static inline uint32_t
ByteSwap32(uint32_t x)
{
__asm__("swap.b %0,%0\n" "swap.w %0,%0\n" "swap.b %0,%0\n": "=r"(x):"0"(x));
return x;
}
# define bswap_16(x) ByteSwap16(x)
# define bswap_32(x) ByteSwap32(x)
static inline uint64_t
ByteSwap64(uint64_t x)
{
union
{
uint64_t ll;
struct
{
uint32_t l,
h;
} l;
} r;
r.l.l = bswap_32(x);
r.l.h = bswap_32(x >> 32);
return r.ll;
}
# define bswap_64(x) ByteSwap64(x)
# else
# define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
# define bswap_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
static inline uint64_t
ByteSwap64(uint64_t x)
{
union
{
uint64_t ll;
uint32_t l[2];
} w , r;
w.ll = x;
r.l[0] = bswap_32(w.l[1]);
r.l[1] = bswap_32(w.l[0]);
return r.ll;
}
# define bswap_64(x) ByteSwap64(x)
# endif /* !ARCH_X86 */
# endif /* !HAVE_BYTESWAP_H */
// be2me ... BigEndian to MachineEndian
// le2me ... LittleEndian to MachineEndian
# ifdef WORDS_BIGENDIAN
# define be2me_16(x) (x)
# define be2me_32(x) (x)
# define be2me_64(x) (x)
# define le2me_16(x) bswap_16(x)
# define le2me_32(x) bswap_32(x)
# define le2me_64(x) bswap_64(x)
# else
# define be2me_16(x) bswap_16(x)
# define be2me_32(x) bswap_32(x)
# define be2me_64(x) bswap_64(x)
# define le2me_16(x) (x)
# define le2me_32(x) (x)
# define le2me_64(x) (x)
# endif
#endif /* __BSWAP_H__ */
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