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The code at http://mega-nerd.com/FPcast/ would appear to make Lua on Win32 using MSVC6 about .1% slower. > Has anyone tested the following on MSVC > > #if defined(__GNUC__) && defined(__i386) > #define lua_number2int(i,d) __asm__ ("fistpl %0":"=m"(i):"t"(d):"st")