The MMX and 3DNow! instructions can't be compiled by 64-bit Visual Studio.

a17d0eb5 · Sam Lantinga · 4030919e · a17d0eb5
Commit a17d0eb5 authored Mar 08, 2011 by Sam Lantinga
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SDL_cpuinfo.h include/SDL_cpuinfo.h +2 -0

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--- a/include/SDL_cpuinfo.h
+++ b/include/SDL_cpuinfo.h
@@ -35,8 +35,10 @@
 /* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
 #if defined(_MSC_VER) && (_MSC_VER >= 1500) && !defined(_WIN32_WCE)
 #include <intrin.h>
+#ifndef _WIN64
 #define __MMX__
 #define __3dNOW__
+#endif
 #define __SSE__
 #define __SSE2__
 #elif defined(__MINGW64_VERSION_MAJOR)