Commit fbda68ea7b3c71195823c85ca41c8afadb00a725
2017-08-17T21:32:00
SDL_endian.h: add SDL_Swap16 and SDL_Swap32 for Watcom/x86 as inline asm Partially fixes Bugzilla #3758.
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diff --git a/include/SDL_endian.h b/include/SDL_endian.h
index 2b06e8c..3eda7f2 100644
--- a/include/SDL_endian.h
+++ b/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)