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Backed out commit 898992405fa7 because memset() does a byte fill and SDL_memset4() does a uint32 fill and this change breaks SDL_FillRect()

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Sam Lantinga 2013-07-09 07:13:58 -07:00
parent b2d7f92773
commit 98053e8a85
1 changed files with 25 additions and 1 deletions
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26
include/SDL_stdinc.h
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@ -257,9 +257,33 @@ extern DECLSPEC void *SDLCALL SDL_memset(void *dst, int c, size_t len);
/* Note that the semantics are different from memset() in that this is a 32-bit assignment */
SDL_FORCE_INLINE void SDL_memset4(void *dst, int val, size_t dwords)
{
SDL_memset(dst, val, dwords * 4);
#if defined(__GNUC__) && defined(i386)
int u0, u1, u2;
__asm__ __volatile__ (
"cld \n\t"
"rep ; stosl \n\t"
: "=&D" (u0), "=&a" (u1), "=&c" (u2)
: "0" (dst), "1" (val), "2" (SDL_static_cast(Uint32, dwords))
: "memory"
);
#else
size_t _n = (dwords + 3) / 4;
Uint32 *_p = SDL_static_cast(Uint32 *, dst);
Uint32 _val = (val);
if (dwords == 0)
return;
switch (dwords % 4)
{
case 0: do { *_p++ = _val;
case 3: *_p++ = _val;
case 2: *_p++ = _val;
case 1: *_p++ = _val;
} while ( --_n );
}
#endif
}
extern DECLSPEC void *SDLCALL SDL_memcpy(void *dst, const void *src, size_t len);
SDL_FORCE_INLINE void *SDL_memcpy4(void *dst, const void *src, size_t dwords)