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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>NeL: NLMISC::CCpuInfo___ struct Reference</title>
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<h1>NLMISC::CCpuInfo___ Struct Reference</h1><code>#include <<a class="el" href="a05616.html">cpu_info.h</a>></code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
This helps to know wether cpu has some features such as mmx, sse ... <dl compact><dt><b>Author:</b></dt><dd>Nicolas Vizerie <p>
Nevrax France </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>2001 </dd></dl>
<p>
<p>
Definition at line <a class="el" href="a05616.html#l00041">41</a> of file <a class="el" href="a05616.html">cpu_info.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a02421.html#NLMISC_1_1CCpuInfo______e0">hasCPUID</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a02421.html#NLMISC_1_1CCpuInfo______e1">hasMMX</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a02421.html#NLMISC_1_1CCpuInfo______e2">hasSSE</a> (void)</td></tr>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NLMISC_1_1CCpuInfo______e0" doxytag="NLMISC::CCpuInfo___::hasCPUID" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CCpuInfo___::hasCPUID </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
test wether the cpuid instruction is supported (always false on non intel architectures)
<p>
Definition at line <a class="el" href="a05615.html#l00108">108</a> of file <a class="el" href="a05615.html">cpu_info.cpp</a>.
<p>
References <a class="el" href="a05981.html#l00100">uint32</a>.
<p>
<div class="fragment"><pre>00109 {
00110 <span class="preprocessor"> #ifdef NL_OS_WINDOWS</span>
00111 <span class="preprocessor"></span> <a class="code" href="a04558.html#a11">uint32</a> result;
00112 __asm
00113 {
00114 pushad
00115 pushfd
00116 <span class="comment">// If ID bit of EFLAGS can change, then cpuid is available</span>
00117 pushfd
00118 pop eax <span class="comment">// Get EFLAG</span>
00119 mov ecx,eax
00120 xor eax,0x200000 <span class="comment">// Flip ID bit</span>
00121 push eax
00122 popfd <span class="comment">// Write EFLAGS</span>
00123 pushfd
00124 pop eax <span class="comment">// read back EFLAG</span>
00125 xor eax,ecx
00126 je noCpuid <span class="comment">// no flip -> no CPUID instr.</span>
00127
00128 popfd <span class="comment">// restore state</span>
00129 popad
00130 mov result, 1
00131 jmp CPUIDPresent
00132
00133 noCpuid:
00134 popfd <span class="comment">// restore state</span>
00135 popad
00136 mov result, 0
00137 CPUIDPresent:
00138 }
00139 <span class="keywordflow">return</span> result == 1;
00140 <span class="preprocessor"> #else</span>
00141 <span class="preprocessor"></span> <span class="keywordflow">return</span> <span class="keyword">false</span>;
00142 <span class="preprocessor"> #endif</span>
00143 <span class="preprocessor"></span>}
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CCpuInfo______e1" doxytag="NLMISC::CCpuInfo___::hasMMX" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CCpuInfo___::hasMMX </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
helps to know wether the processor features mmx instruction set This is initialized at started, so its fast (always false on not 0x86 architecture ...)
<p>
Definition at line <a class="el" href="a05615.html#l00144">144</a> of file <a class="el" href="a05615.html">cpu_info.cpp</a>.
<p>
References <a class="el" href="a05615.html#l00105">NLMISC::HasMMX</a>.
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<div class="fragment"><pre>00144 { <span class="keywordflow">return</span> <a class="code" href="a05378.html#a5">HasMMX</a>; }
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<a class="anchor" name="NLMISC_1_1CCpuInfo______e2" doxytag="NLMISC::CCpuInfo___::hasSSE" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CCpuInfo___::hasSSE </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
helps to know wether the processor has streaming SIMD instructions (the OS must supports it) This is initialized at started, so its fast (always false on not 0x86 architecture ...)
<p>
Definition at line <a class="el" href="a05615.html#l00145">145</a> of file <a class="el" href="a05615.html">cpu_info.cpp</a>.
<p>
References <a class="el" href="a05615.html#l00106">NLMISC::HasSSE</a>.
<p>
<div class="fragment"><pre>00145 { <span class="keywordflow">return</span> <a class="code" href="a05378.html#a6">HasSSE</a>; }
</pre></div> </td>
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<hr>The documentation for this struct was generated from the following files:<ul>
<li><a class="el" href="a05616.html">cpu_info.h</a><li><a class="el" href="a05615.html">cpu_info.cpp</a></ul>
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