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SDL_endian.h: add SDL_Swap16 and SDL_Swap32 for Watcom/x86 as inline asm

Partially fixes Bugzilla #3758.
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sezero committed Aug 18, 2017
1 parent eccbe36 commit fbda68ea7b3c71195823c85ca41c8afadb00a725
Showing with 21 additions and 0 deletions.
  1. +21 −0 include/SDL_endian.h
@@ -96,6 +96,12 @@ SDL_Swap16(Uint16 x)
__asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
return x;
}
#elif defined(__WATCOMC__) && defined(__386__)
extern _inline Uint16 SDL_Swap16(Uint16);
#pragma aux SDL_Swap16 = \
"xchg al, ah" \
parm [ax] \
modify [ax];
#else
SDL_FORCE_INLINE Uint16
SDL_Swap16(Uint16 x)
@@ -136,6 +142,21 @@ SDL_Swap32(Uint32 x)
__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
return x;
}
#elif defined(__WATCOMC__) && defined(__386__)
extern _inline Uint32 SDL_Swap32(Uint32);
#ifndef __SW_3 /* 486+ */
#pragma aux SDL_Swap32 = \
"bswap eax" \
parm [eax] \
modify [eax];
#else /* 386-only */
#pragma aux SDL_Swap32 = \
"xchg al, ah" \
"ror eax, 16" \
"xchg al, ah" \
parm [eax] \
modify [eax];
#endif
#else
SDL_FORCE_INLINE Uint32
SDL_Swap32(Uint32 x)

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