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<hr><h1>fast_mem.cpp</h1><a href="fast__mem_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2000-2002 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025
00026 <font class="preprocessor">#include "<a class="code" href="stdmisc_8h.html">stdmisc.h</a>"</font>
00027
00028 <font class="preprocessor">#include "<a class="code" href="fast__mem_8h.html">nel/misc/fast_mem.h</a>"</font>
00029 <font class="preprocessor">#include "<a class="code" href="system__info_8h.html">nel/misc/system_info.h</a>"</font>
00030
00031
00032 <font class="keyword">namespace </font>NLMISC
00033 {
00034
00035 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00036 <font class="preprocessor"></font>
00037
00038 <font class="comment">// ***************************************************************************</font>
00039 <font class="keywordtype">void</font> *CFastMem::memcpySSE(<font class="keywordtype">void</font> *dest, <font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, size_t nbytes)
00040 {
00041 _asm
00042 {
00043 mov esi, <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>
00044 mov edi, dest
00045 mov ebx, nbytes
00046
00047 <font class="comment">// edx takes number of bytes%64</font>
00048 mov edx, ebx
00049 and edx, 63
00050
00051 <font class="comment">// ebx takes number of bytes/64</font>
00052 shr ebx, 6
00053 jz byteCopy
00054
00055
00056 loop4k: <font class="comment">// flush 4k into temporary buffer </font>
00057 push esi
00058 mov ecx, ebx
00059 <font class="comment">// copy per block of 64 bytes. Must not override 64*64= 4096 bytes.</font>
00060 cmp ecx, 64
00061 jle skipMiniMize
00062 mov ecx, 64
00063 skipMiniMize:
00064 <font class="comment">// eax takes the number of 64bytes packet for this block.</font>
00065 mov eax, ecx
00066
00067 loopMemToL1:
00068 prefetchnta 64[ESI] <font class="comment">// Prefetch next loop, non-temporal </font>
00069 prefetchnta 96[ESI]
00070
00071 movq mm1, 0[ESI] <font class="comment">// Read in source data </font>
00072 movq mm2, 8[ESI]
00073 movq mm3, 16[ESI]
00074 movq mm4, 24[ESI]
00075 movq mm5, 32[ESI]
00076 movq mm6, 40[ESI]
00077 movq mm7, 48[ESI]
00078 movq mm0, 56[ESI]
00079
00080 add esi, 64
00081 dec ecx
00082 jnz loopMemToL1
00083
00084 pop esi <font class="comment">// Now copy from L1 to system memory </font>
00085 mov ecx, eax
00086
00087 loopL1ToMem:
00088 movq mm1, 0[ESI] <font class="comment">// Read in source data from L1 </font>
00089 movq mm2, 8[ESI]
00090 movq mm3, 16[ESI]
00091 movq mm4, 24[ESI]
00092 movq mm5, 32[ESI]
00093 movq mm6, 40[ESI]
00094 movq mm7, 48[ESI]
00095 movq mm0, 56[ESI]
00096
00097 movntq 0[EDI], mm1 <font class="comment">// Non-temporal stores </font>
00098 movntq 8[EDI], mm2
00099 movntq 16[EDI], mm3
00100 movntq 24[EDI], mm4
00101 movntq 32[EDI], mm5
00102 movntq 40[EDI], mm6
00103 movntq 48[EDI], mm7
00104 movntq 56[EDI], mm0
00105
00106 add esi, 64
00107 add edi, 64
00108 dec ecx
00109 jnz loopL1ToMem
00110
00111 <font class="comment">// Do next 4k block </font>
00112 sub ebx, eax
00113 jnz loop4k
00114
00115 emms
00116
00117 byteCopy:
00118 <font class="comment">// Do last bytes with std cpy</font>
00119 mov ecx, edx
00120 rep movsb
00121 }
00122 <font class="keywordflow">return</font> dest;
00123 }
00124
00125 <font class="comment">// ***************************************************************************</font>
00126 <font class="keywordtype">void</font> CFastMem::precacheSSE(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00127 {
00128 _asm
00129 {
00130 mov esi, <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>
00131 mov ecx, nbytes
00132 <font class="comment">// 64 bytes per pass</font>
00133 shr ecx, 6
00134 jz endLabel
00135
00136 loopMemToL1:
00137 prefetchnta 64[ESI] <font class="comment">// Prefetch next loop, non-temporal </font>
00138 prefetchnta 96[ESI]
00139
00140 movq mm1, 0[ESI] <font class="comment">// Read in source data </font>
00141 movq mm2, 8[ESI]
00142 movq mm3, 16[ESI]
00143 movq mm4, 24[ESI]
00144 movq mm5, 32[ESI]
00145 movq mm6, 40[ESI]
00146 movq mm7, 48[ESI]
00147 movq mm0, 56[ESI]
00148
00149 add esi, 64
00150 dec ecx
00151 jnz loopMemToL1
00152
00153 emms
00154
00155 endLabel:
00156 }
00157 }
00158
00159 <font class="comment">// ***************************************************************************</font>
00160 <font class="keywordtype">void</font> CFastMem::precacheMMX(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00161 {
00162 _asm
00163 {
00164 mov esi, <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>
00165 mov ecx, nbytes
00166 <font class="comment">// 64 bytes per pass</font>
00167 shr ecx, 6
00168 jz endLabel
00169
00170 loopMemToL1:
00171 movq mm1, 0[ESI] <font class="comment">// Read in source data </font>
00172 movq mm2, 8[ESI]
00173 movq mm3, 16[ESI]
00174 movq mm4, 24[ESI]
00175 movq mm5, 32[ESI]
00176 movq mm6, 40[ESI]
00177 movq mm7, 48[ESI]
00178 movq mm0, 56[ESI]
00179
00180 add esi, 64
00181 dec ecx
00182 jnz loopMemToL1
00183
00184 emms
00185
00186 endLabel:
00187 }
00188 }
00189
00190
00191 <font class="comment">// ***************************************************************************</font>
00192 <font class="keywordtype">void</font> CFastMem::precache(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00193 {
00194 <font class="keywordflow">if</font>(<a class="code" href="classNLMISC_1_1CSystemInfo.html#d5">NLMISC::CSystemInfo::hasSSE</a>())
00195 precacheSSE(<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, nbytes);
00196 <font class="keywordflow">else</font> <font class="keywordflow">if</font>(<a class="code" href="classNLMISC_1_1CSystemInfo.html#d4">NLMISC::CSystemInfo::hasMMX</a>())
00197 precacheMMX(<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, nbytes);
00198 }
00199
00200
00201 <font class="preprocessor">#else</font>
00202 <font class="preprocessor"></font>
00203
00204 <font class="comment">// ***************************************************************************</font>
<a name="l00205"></a><a class="code" href="classNLMISC_1_1CFastMem.html#d1">00205</a> <font class="keywordtype">void</font> *CFastMem::memcpySSE(<font class="keywordtype">void</font> *dst, <font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, size_t nbytes)
00206 {
00207 <font class="comment">// Use std memcpy.</font>
00208 <font class="keywordflow">return</font> memcpy(dst, <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, nbytes);
00209 }
<a name="l00210"></a><a class="code" href="classNLMISC_1_1CFastMem.html#d2">00210</a> <font class="keywordtype">void</font> CFastMem::precacheSSE(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00211 {
00212 <font class="comment">// no-op.</font>
00213 }
<a name="l00214"></a><a class="code" href="classNLMISC_1_1CFastMem.html#d3">00214</a> <font class="keywordtype">void</font> CFastMem::precacheMMX(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00215 {
00216 <font class="comment">// no-op.</font>
00217 }
<a name="l00218"></a><a class="code" href="classNLMISC_1_1CFastMem.html#d0">00218</a> <font class="keywordtype">void</font> CFastMem::precache(<font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, uint nbytes)
00219 {
00220 <font class="comment">// no-op.</font>
00221 }
00222
00223 <font class="preprocessor">#endif</font>
00224 <font class="preprocessor"></font>
00225 <font class="keyword">typedef</font> <font class="keywordtype">void</font> *(*memcpyPtr)(<font class="keywordtype">void</font> *dts, <font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, size_t nbytes);
00226
00227 <font class="keyword">static</font> <a class="code" href="namespaceNLMISC.html#a193">memcpyPtr</a> <a class="code" href="namespaceNLMISC.html#a295">findBestmemcpy</a> ()
00228 {
00229 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00230 <font class="preprocessor"></font> <font class="keywordflow">if</font> (CSystemInfo::hasSSE ())
00231 <font class="keywordflow">return</font> CFastMem::memcpySSE;
00232 <font class="keywordflow">else</font>
00233 return ::memcpy;
00234 <font class="preprocessor">#else // NL_OS_WINDOWS</font>
00235 <font class="preprocessor"></font> return ::memcpy;
00236 <font class="preprocessor">#endif // NL_OS_WINDOWS</font>
00237 <font class="preprocessor"></font>}
00238
00239 <font class="keywordtype">void</font> *(*CFastMem::memcpy)(<font class="keywordtype">void</font> *dts, <font class="keyword">const</font> <font class="keywordtype">void</font> *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, size_t nbytes) = <a class="code" href="namespaceNLMISC.html#a295">findBestmemcpy</a> ();
00240
00241 } <font class="comment">// NLMISC</font>
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