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Add m68k assembly routines for endianness conversion

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40986
This commit is contained in:
Patrice Mandin 2004-11-22 10:16:58 +00:00
parent 42648118e4
commit 9e6a139081
1 changed files with 12 additions and 0 deletions
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12
include/SDL_endian.h
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@ -79,6 +79,12 @@ static __inline__ Uint16 SDL_Swap16(Uint16 x)
__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
return result;
}
#elif defined(__GNUC__) && defined(__M68000__)
static __inline__ Uint16 SDL_Swap16(Uint16 x)
{
__asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
return x;
}
#else
static __inline__ Uint16 SDL_Swap16(Uint16 x) {
return((x<<8)|(x>>8));
@ -107,6 +113,12 @@ static __inline__ Uint32 SDL_Swap32(Uint32 x)
__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
return result;
}
#elif defined(__GNUC__) && defined(__M68000__)
static __inline__ Uint16 SDL_Swap32(Uint16 x)
{
__asm__("rorw #8,%0;\t\nswap %0;\t\nror #8,%0" : "=d" (x) : "0" (x) : "cc");
return x;
}
#else
static __inline__ Uint32 SDL_Swap32(Uint32 x) {
return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));