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removed a useless restriction from Watcom version of SDL_Swap32() 

also did a little whitespace tidy-up.
This commit is contained in:
Ozkan Sezer 2021-02-24 20:03:50 +03:00
parent b8d2185277
commit 55a385a333
1 changed files with 21 additions and 33 deletions
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24
include/SDL_endian.h
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@ -178,19 +178,10 @@ SDL_Swap32(Uint32 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
#elif defined(_MSC_VER)
#pragma intrinsic(_byteswap_ulong)
#define SDL_Swap32(x) _byteswap_ulong(x)
@ -211,18 +202,16 @@ SDL_Swap32(Uint32 x)
SDL_FORCE_INLINE Uint64
SDL_Swap64(Uint64 x)
{
union
{
struct
{
union {
struct {
Uint32 a, b;
} s;
Uint64 u;
} v;
v.u = x;
__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
"1"(v.s.
b));
__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
: "=r"(v.s.a), "=r"(v.s.b)
: "0" (v.s.a), "1"(v.s.b));
return v.u;
}
#elif defined(__GNUC__) && defined(__x86_64__)
@ -264,8 +253,7 @@ SDL_Swap64(Uint64 x)
SDL_FORCE_INLINE float
SDL_SwapFloat(float x)
{
union
{
union {
float f;
Uint32 ui32;
} swapper;