[FFmpeg-devel] m68k code for bswap

[ami_stuff]

Hi,

Here is m68k asm-optimized code for bswap.
Maybe someone with more knowledge can add it to "libavutil/bswap.h" file.

#ifndef ENDIAN_H
#define ENDIAN_H

#ifdef __X86__
#define LITTLE_ENDIAN 1
#endif

#ifdef __M68K__ // use 68k inline routines

int64 endian64(__reg("d0/d1") int64) =
    "\tmove.l\td1,d2\n"
    "\tmove.l\td0,d1\n"
    "\tmove.l\td2,d0\n"
    "\trol.w\t#8,d0\n"
    "\trol.w\t#8,d1\n"
    "\tswap\td0\n"
    "\tswap\td1\n"
    "\trol.w\t#8,d0\n"
    "\trol.w\t#8,d1";

int32 endian32(__reg("d0") int32) =
    "\trol.w\t#8,d0\n"
    "\tswap\td0\n"
    "\trol.w\t#8,d0";

int16 endian16(__reg("d0") int16) =
    "\trol.w\t#8,d0";

#else // use generic C routines

#define endian32(A) \
(((uint32)(A&0xFF000000)>>24)+((uint32)(A&0xFF0000)>>8))+((uint32)(A&0xFF00)<<8) \
+((uint32)(A&0xFF)<<24))

#define endian16(A) \
(((uint32)(A&0xFF00)>>8))+((uint32)(A&0xFF)<<8))

#endif

#ifdef LITTLE_ENDIAN

#define be2nat16(A) endian16(A)
#define be2nat32(A) endian32(A)

#define le2nat16(A) (A)
#define le2nat32(A) (A)

#define nat2be16(A) endian16(A)
#define nat2be32(A) endian32(A)

#define nat2le16(A) (A)
#define nat2le32(A) (A)

#else

#define be2nat16(A) (A)
#define be2nat32(A) (A)

#define le2nat16(A) endian16(A)
#define le2nat32(A) endian32(A)

#define nat2be16(A) (A)
#define nat2be32(A) (A)

#define nat2le16(A) endian16(A)
#define nat2le32(A) endian32(A)

#endif

#endif /* ENDIAN_H */

The website's owner is author of the m68k asm-inlines.

http://web.archive.org/web/20050216094707/http://a500.org/downloads/source/endian.h

Regards