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    <p>The Lua code base has the following snippet to do this (check in src/luaconf.h from www.lua.org). If you find (SO finds) a faster way, I'm sure they'd be thrilled.</p> <p>Oh, <code>lua_Number</code> means double. :)</p> <pre><code>/* @@ lua_number2int is a macro to convert lua_Number to int. @@ lua_number2integer is a macro to convert lua_Number to lua_Integer. ** CHANGE them if you know a faster way to convert a lua_Number to ** int (with any rounding method and without throwing errors) in your ** system. In Pentium machines, a naive typecast from double to int ** in C is extremely slow, so any alternative is worth trying. */ /* On a Pentium, resort to a trick */ #if defined(LUA_NUMBER_DOUBLE) &amp;&amp; !defined(LUA_ANSI) &amp;&amp; !defined(__SSE2__) &amp;&amp; \ (defined(__i386) || defined (_M_IX86) || defined(__i386__)) /* On a Microsoft compiler, use assembler */ #if defined(_MSC_VER) #define lua_number2int(i,d) __asm fld d __asm fistp i #define lua_number2integer(i,n) lua_number2int(i, n) /* the next trick should work on any Pentium, but sometimes clashes with a DirectX idiosyncrasy */ #else union luai_Cast { double l_d; long l_l; }; #define lua_number2int(i,d) \ { volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; } #define lua_number2integer(i,n) lua_number2int(i, n) #endif /* this option always works, but may be slow */ #else #define lua_number2int(i,d) ((i)=(int)(d)) #define lua_number2integer(i,d) ((i)=(lua_Integer)(d)) #endif </code></pre>
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