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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>NeL: NLMISC::CFastMem class Reference</title>
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<h1>NLMISC::CFastMem Class Reference</h1><code>#include <<a class="el" href="a05703.html">fast_mem.h</a>></code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Functions for Fast Memory manipulation with Pentium-class processors. From <a href="http://www.sgi.com/developers/technology/irix/resources/asc_cpu.html">http://www.sgi.com/developers/technology/irix/resources/asc_cpu.html</a> <dl compact><dt><b>Author:</b></dt><dd>Lionel Berenguier <p>
Nevrax France </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>2002 </dd></dl>
<p>
<p>
Definition at line <a class="el" href="a05703.html#l00044">44</a> of file <a class="el" href="a05703.html">fast_mem.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>void * </td><td class="memItemRight" valign=bottom><a class="el" href="a02515.html#NLMISC_1_1CFastMeme0">memcpySSE</a> (void *dst, const void *<a class="el" href="a04223.html#a652">src</a>, size_t nbytes)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a02515.html#NLMISC_1_1CFastMeme1">precache</a> (const void *<a class="el" href="a04223.html#a652">src</a>, <a class="el" href="a04558.html#a15">uint</a> nbytes)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a02515.html#NLMISC_1_1CFastMeme2">precacheMMX</a> (const void *<a class="el" href="a04223.html#a652">src</a>, <a class="el" href="a04558.html#a15">uint</a> nbytes)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a02515.html#NLMISC_1_1CFastMeme3">precacheSSE</a> (const void *<a class="el" href="a04223.html#a652">src</a>, <a class="el" href="a04558.html#a15">uint</a> nbytes)</td></tr>
<tr><td colspan=2><br><h2>Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void *(* </td><td class="memItemRight" valign=bottom><a class="el" href="a02515.html#NLMISC_1_1CFastMems0">memcpy</a> )(void *dts, const void *<a class="el" href="a04223.html#a652">src</a>, size_t nbytes)</td></tr>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMeme0" doxytag="NLMISC::CFastMem::memcpySSE" ></a><p>
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<td class="md" nowrap valign="top"> void * NLMISC::CFastMem::memcpySSE </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void * </td>
<td class="mdname" nowrap> <em>dst</em>, </td>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const void * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>size_t </td>
<td class="mdname" nowrap> <em>nbytes</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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<p>
Fast memcpy using SSE instructions: prefetchnta and movntq. Can be called only if SSE and MMX is supported NB: Copy per block of 4K through L1 cache Result is typically 420 Mo/s instead of 150 Mo/s.
<p>
Definition at line <a class="el" href="a05702.html#l00205">205</a> of file <a class="el" href="a05702.html">fast_mem.cpp</a>.
<p>
References <a class="el" href="a05702.html#l00239">memcpy</a>, and <a class="el" href="a05646.html#l01124">src</a>.
<p>
<div class="fragment"><pre>00206 {
00207 <span class="comment">// Use std memcpy.</span>
00208 <span class="keywordflow">return</span> <a class="code" href="a02515.html#NLMISC_1_1CFastMems0">memcpy</a>(dst, src, nbytes);
00209 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CFastMeme1" doxytag="NLMISC::CFastMem::precache" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CFastMem::precache </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const void * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>nbytes</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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</td>
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<p>
Fast precaching of memory in L1 cache using SSE or MMX where available (NB: others methods don't do the test) nbytes should not override 4K
<p>
Definition at line <a class="el" href="a05702.html#l00218">218</a> of file <a class="el" href="a05702.html">fast_mem.cpp</a>.
<p>
References <a class="el" href="a05646.html#l01124">src</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
<div class="fragment"><pre>00219 {
00220 <span class="comment">// no-op.</span>
00221 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CFastMeme2" doxytag="NLMISC::CFastMem::precacheMMX" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CFastMem::precacheMMX </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const void * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>nbytes</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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</td>
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<p>
Fast precaching of memory in L1 cache using MMX instructions only: movq Result is typically 720 Mo/s (surely slower because of overhead). Hence prefer <a class="el" href="a02515.html#NLMISC_1_1CFastMeme3">precacheSSE()</a> when available. nbytes should not override 4K
<p>
Definition at line <a class="el" href="a05702.html#l00214">214</a> of file <a class="el" href="a05702.html">fast_mem.cpp</a>.
<p>
References <a class="el" href="a05646.html#l01124">src</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
<div class="fragment"><pre>00215 {
00216 <span class="comment">// no-op.</span>
00217 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CFastMeme3" doxytag="NLMISC::CFastMem::precacheSSE" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CFastMem::precacheSSE </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const void * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>nbytes</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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<table cellspacing=5 cellpadding=0 border=0>
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</td>
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<p>
Fast precaching of memory in L1 cache using MMX/SSE instructions: movq and prefetchnta Result is typically 880 Mo/s (surely slower because of overhead). nbytes should not override 4K
<p>
Definition at line <a class="el" href="a05702.html#l00210">210</a> of file <a class="el" href="a05702.html">fast_mem.cpp</a>.
<p>
References <a class="el" href="a05646.html#l01124">src</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
<div class="fragment"><pre>00211 {
00212 <span class="comment">// no-op.</span>
00213 }
</pre></div> </td>
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<hr><h2>Field Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMems0" doxytag="NLMISC::CFastMem::memcpy" ></a><p>
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<td class="md" nowrap valign="top"> void *(* <a class="el" href="a02515.html#NLMISC_1_1CFastMems0">NLMISC::CFastMem::memcpy</a>)(void *dts, const void *<a class="el" href="a04223.html#a652">src</a>, size_t nbytes)=findBestmemcpy()<code> [static]</code>
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<p>
This is a function pointer that points on the best memcpy function available depending of the OS and proc. In the best case, it will use <a class="el" href="a02515.html#NLMISC_1_1CFastMeme0">memcpySSE()</a>, and in worst case, it'll use the libc <a class="el" href="a02515.html#NLMISC_1_1CFastMems0">memcpy()</a> Simply use it this way: CFastMem::memcpy(dst, src, size);
<p>
Definition at line <a class="el" href="a05702.html#l00239">239</a> of file <a class="el" href="a05702.html">fast_mem.cpp</a>.
<p>
Referenced by <a class="el" href="a05612.html#l00125">NLSOUND::CContextSoundContainer< NbJoker, UseRandom, Shift >::init()</a>, and <a class="el" href="a05702.html#l00205">memcpySSE()</a>. </td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a05703.html">fast_mem.h</a><li><a class="el" href="a05702.html">fast_mem.cpp</a></ul>
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