cpu_8cpp-source.html

著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00087"></a>00087         longjmp(s_jmpNoSSE2, 1);
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 <span class="preprocessor">#endif</span>
<a name="l00090"></a>00090 <span class="preprocessor"></span>
<a name="l00091"></a>00091 <span class="preprocessor">#elif _MSC_VER &gt;= 1400 &amp;&amp; CRYPTOPP_BOOL_X64</span>
<a name="l00092"></a>00092 <span class="preprocessor"></span>
<a name="l00093"></a>00093 <span class="keywordtype">bool</span> CpuId(word32 input, word32 *output)
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095         __cpuid((<span class="keywordtype">int</span> *)output, input);
<a name="l00096"></a>00096         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 
<a name="l00099"></a>00099 <span class="preprocessor">#endif</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span>
<a name="l00101"></a>00101 <span class="preprocessor">#ifdef CRYPTOPP_CPUID_AVAILABLE</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span>
<a name="l00103"></a>00103 <span class="keyword">static</span> <span class="keywordtype">bool</span> TrySSE2()
<a name="l00104"></a>00104 {
<a name="l00105"></a>00105 <span class="preprocessor">#if CRYPTOPP_BOOL_X64</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span>        <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00107"></a>00107 <span class="preprocessor">#elif defined(_MSC_VER)</span>
<a name="l00108"></a>00108 <span class="preprocessor"></span>    __try
<a name="l00109"></a>00109         {
<a name="l00110"></a>00110 <span class="preprocessor">#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE</span>
<a name="l00111"></a>00111 <span class="preprocessor"></span>        AS2(por xmm0, xmm0)        <span class="comment">// executing SSE2 instruction</span>
<a name="l00112"></a>00112 <span class="preprocessor">#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span>                __mm128i x = _mm_setzero_si128();
<a name="l00114"></a>00114                 <span class="keywordflow">return</span> _mm_cvtsi128_si32(x) == 0;
<a name="l00115"></a>00115 <span class="preprocessor">#endif</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span>        }
<a name="l00117"></a>00117     __except (1)
<a name="l00118"></a>00118         {
<a name="l00119"></a>00119                 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00120"></a>00120     }
<a name="l00121"></a>00121         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00122"></a>00122 <span class="preprocessor">#elif defined(__GNUC__)</span>
<a name="l00123"></a>00123 <span class="preprocessor"></span>        SigHandler oldHandler = signal(SIGILL, SigIllHandlerSSE2);
<a name="l00124"></a>00124         <span class="keywordflow">if</span> (oldHandler == SIG_ERR)
<a name="l00125"></a>00125                 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00126"></a>00126 
<a name="l00127"></a>00127         <span class="keywordtype">bool</span> result = <span class="keyword">true</span>;
<a name="l00128"></a>00128         <span class="keywordflow">if</span> (setjmp(s_jmpNoSSE2))
<a name="l00129"></a>00129                 result = <span class="keyword">false</span>;
<a name="l00130"></a>00130         <span class="keywordflow">else</span>
<a name="l00131"></a>00131         {
<a name="l00132"></a>00132 <span class="preprocessor">#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE</span>
<a name="l00133"></a>00133 <span class="preprocessor"></span>                __asm __volatile (<span class="stringliteral">"por %xmm0, %xmm0"</span>);
<a name="l00134"></a>00134 <span class="preprocessor">#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span>                __mm128i x = _mm_setzero_si128();
<a name="l00136"></a>00136                 result = _mm_cvtsi128_si32(x) == 0;
<a name="l00137"></a>00137 <span class="preprocessor">#endif</span>
<a name="l00138"></a>00138 <span class="preprocessor"></span>        }
<a name="l00139"></a>00139 
<a name="l00140"></a>00140         signal(SIGILL, oldHandler);
<a name="l00141"></a>00141         <span class="keywordflow">return</span> result;
<a name="l00142"></a>00142 <span class="preprocessor">#else</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span>        <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00144"></a>00144 <span class="preprocessor">#endif</span>
<a name="l00145"></a>00145 <span class="preprocessor"></span>}
<a name="l00146"></a>00146 
<a name="l00147"></a>00147 <span class="keywordtype">bool</span> g_x86DetectionDone = <span class="keyword">false</span>;
<a name="l00148"></a>00148 <span class="keywordtype">bool</span> g_hasSSE2 = <span class="keyword">false</span>, g_hasSSSE3 = <span class="keyword">false</span>, g_hasMMX = <span class="keyword">false</span>, g_isP4 = <span class="keyword">false</span>;
<a name="l00149"></a>00149 word32 g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
<a name="l00150"></a>00150 
<a name="l00151"></a>00151 <span class="keywordtype">void</span> DetectX86Features()
<a name="l00152"></a>00152 {
<a name="l00153"></a>00153         word32 cpuid[4], cpuid1[4];
<a name="l00154"></a>00154         <span class="keywordflow">if</span> (!CpuId(0, cpuid))
<a name="l00155"></a>00155                 <span class="keywordflow">return</span>;
<a name="l00156"></a>00156         <span class="keywordflow">if</span> (!CpuId(1, cpuid1))
<a name="l00157"></a>00157                 <span class="keywordflow">return</span>;
<a name="l00158"></a>00158 
<a name="l00159"></a>00159         g_hasMMX = (cpuid1[3] &amp; (1 &lt;&lt; 23)) != 0;
<a name="l00160"></a>00160         <span class="keywordflow">if</span> ((cpuid1[3] &amp; (1 &lt;&lt; 26)) != 0)
<a name="l00161"></a>00161                 g_hasSSE2 = TrySSE2();
<a name="l00162"></a>00162         g_hasSSSE3 = g_hasSSE2 &amp;&amp; (cpuid1[2] &amp; (1&lt;&lt;9));
<a name="l00163"></a>00163 
<a name="l00164"></a>00164         <a class="code" href="gf2n_8h.html#cd9c045f0b5c2a7595a8a0872dc80f59">std::swap</a>(cpuid[2], cpuid[3]);
<a name="l00165"></a>00165         <span class="keywordflow">if</span> (memcmp(cpuid+1, <span class="stringliteral">"GenuineIntel"</span>, 12) == 0)
<a name="l00166"></a>00166         {
<a name="l00167"></a>00167                 g_isP4 = ((cpuid1[0] &gt;&gt; 8) &amp; 0xf) == 0xf;
<a name="l00168"></a>00168                 g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
<a name="l00169"></a>00169         }
<a name="l00170"></a>00170         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (memcmp(cpuid+1, <span class="stringliteral">"AuthenticAMD"</span>, 12) == 0)
<a name="l00171"></a>00171         {
<a name="l00172"></a>00172                 CpuId(0x80000005, cpuid);
<a name="l00173"></a>00173                 g_cacheLineSize = GETBYTE(cpuid[2], 0);
<a name="l00174"></a>00174         }
<a name="l00175"></a>00175 
<a name="l00176"></a>00176         <span class="keywordflow">if</span> (!g_cacheLineSize)
<a name="l00177"></a>00177                 g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
<a name="l00178"></a>00178 
<a name="l00179"></a>00179         g_x86DetectionDone = <span class="keyword">true</span>;
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181 
<a name="l00182"></a>00182 <span class="preprocessor">#endif</span>
<a name="l00183"></a>00183 <span class="preprocessor"></span>
<a name="l00184"></a>00184 NAMESPACE_END
<a name="l00185"></a>00185 
<a name="l00186"></a>00186 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:20 2007 for Crypto++ by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address>
</body>
</html>