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<h1>Random123/ReinterpretCtr.hpp</h1> </div>
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<a href="ReinterpretCtr_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">Copyright 2010-2011, D. E. Shaw Research.</span>
<a name="l00003"></a>00003 <span class="comment">All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment">modification, are permitted provided that the following conditions are</span>
<a name="l00007"></a>00007 <span class="comment">met:</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">* Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> notice, this list of conditions, and the following disclaimer.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment">* Redistributions in binary form must reproduce the above copyright</span>
<a name="l00013"></a>00013 <span class="comment"> notice, this list of conditions, and the following disclaimer in the</span>
<a name="l00014"></a>00014 <span class="comment"> documentation and/or other materials provided with the distribution.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment">* Neither the name of D. E. Shaw Research nor the names of its</span>
<a name="l00017"></a>00017 <span class="comment"> contributors may be used to endorse or promote products derived from</span>
<a name="l00018"></a>00018 <span class="comment"> this software without specific prior written permission.</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00021"></a>00021 <span class="comment">"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00022"></a>00022 <span class="comment">LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00023"></a>00023 <span class="comment">A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00024"></a>00024 <span class="comment">OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00025"></a>00025 <span class="comment">SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00026"></a>00026 <span class="comment">LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00027"></a>00027 <span class="comment">DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00028"></a>00028 <span class="comment">THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00029"></a>00029 <span class="comment">(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00030"></a>00030 <span class="comment">OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00031"></a>00031 <span class="comment">*/</span>
<a name="l00032"></a>00032 <span class="preprocessor">#ifndef __ReinterpretCtr_dot_hpp__</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#define __ReinterpretCtr_dot_hpp__</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="compilerfeatures_8h.html">features/compilerfeatures.h</a>"</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <cstring></span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">namespace </span>r123{
<a name="l00053"></a>00053 <span class="keyword">template</span> <<span class="keyword">typename</span> ToType, <span class="keyword">typename</span> CBRNG>
<a name="l00054"></a><a class="code" href="structr123_1_1ReinterpretCtr.html">00054</a> <span class="keyword">struct </span><a class="code" href="structr123_1_1ReinterpretCtr.html">ReinterpretCtr</a>{
<a name="l00055"></a><a class="code" href="structr123_1_1ReinterpretCtr.html#a26cf9e933b35411c37070c948085ba02">00055</a> <span class="keyword">typedef</span> ToType ctr_type;
<a name="l00056"></a><a class="code" href="structr123_1_1ReinterpretCtr.html#a470b21676ed709aa9d9ad524a67410f1">00056</a> <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::key_type key_type;
<a name="l00057"></a><a class="code" href="structr123_1_1ReinterpretCtr.html#ae0accaee618b5eb28a24acd516b3a4c6">00057</a> <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::ctr_type bctype;
<a name="l00058"></a><a class="code" href="structr123_1_1ReinterpretCtr.html#a4b0b69c1aa58d62bb22e51e16c586bee">00058</a> <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::ukey_type ukey_type;
<a name="l00059"></a>00059 R123_STATIC_ASSERT(<span class="keyword">sizeof</span>(ToType) == <span class="keyword">sizeof</span>(<a class="code" href="structr123_1_1ReinterpretCtr.html#ae0accaee618b5eb28a24acd516b3a4c6">bctype</a>) && <span class="keyword">sizeof</span>(<span class="keyword">typename</span> bctype::value_type) != 16,
<a name="l00060"></a>00060 <span class="stringliteral">"ReinterpretCtr: sizeof(ToType) is not the same as sizeof(CBRNG::ctr_type) or CBRNG::ctr_type::value_type looks like it might be __m128i"</span>);
<a name="l00061"></a>00061 <span class="comment">// It's amazingly difficult to safely do conversions with __m128i.</span>
<a name="l00062"></a>00062 <span class="comment">// If we use the operator() implementation below with a CBRNG</span>
<a name="l00063"></a>00063 <span class="comment">// whose ctr_type is r123array1xm128i, gcc4.6 optimizes away the</span>
<a name="l00064"></a>00064 <span class="comment">// memcpys, inlines the operator()(c,k), and produces assembly</span>
<a name="l00065"></a>00065 <span class="comment">// language that ends with an aesenclast instruction with a</span>
<a name="l00066"></a>00066 <span class="comment">// destination operand pointing to an unaligned memory address ...</span>
<a name="l00067"></a>00067 <span class="comment">// Segfault! See: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50444</span>
<a name="l00068"></a>00068 <span class="comment">// MSVC also produces code that crashes. We suspect a</span>
<a name="l00069"></a>00069 <span class="comment">// similar mechanism but haven't done the debugging necessary to</span>
<a name="l00070"></a>00070 <span class="comment">// be sure. We were able to 'fix' gcc4.6 by making bc a mutable</span>
<a name="l00071"></a>00071 <span class="comment">// data member rather than declaring it in the scope of</span>
<a name="l00072"></a>00072 <span class="comment">// operator(). That didn't fix the MSVC problems, though.</span>
<a name="l00073"></a>00073 <span class="comment">//</span>
<a name="l00074"></a>00074 <span class="comment">// Conclusion - don't touch __m128i, at least for now. The</span>
<a name="l00075"></a>00075 <span class="comment">// easiest (but highly imprecise) way to do that is the static</span>
<a name="l00076"></a>00076 <span class="comment">// assertion above that rejects bctype::value_types of size 16. -</span>
<a name="l00077"></a>00077 <span class="comment">// Sep 2011.</span>
<a name="l00078"></a><a class="code" href="structr123_1_1ReinterpretCtr.html#a91edc5103397372cc5509ad17c0fc83a">00078</a> <a class="code" href="structr123_1_1ReinterpretCtr.html#a26cf9e933b35411c37070c948085ba02">ctr_type</a> <a class="code" href="structr123_1_1ReinterpretCtr.html#a91edc5103397372cc5509ad17c0fc83a">operator()</a>(<a class="code" href="structr123_1_1ReinterpretCtr.html#a26cf9e933b35411c37070c948085ba02">ctr_type</a> c, <a class="code" href="structr123_1_1ReinterpretCtr.html#a470b21676ed709aa9d9ad524a67410f1">key_type</a> k){
<a name="l00079"></a>00079 <a class="code" href="structr123_1_1ReinterpretCtr.html#ae0accaee618b5eb28a24acd516b3a4c6">bctype</a> bc;
<a name="l00080"></a>00080 std::memcpy(&bc, &c, <span class="keyword">sizeof</span>(c));
<a name="l00081"></a>00081 CBRNG b;
<a name="l00082"></a>00082 bc = b(bc, k);
<a name="l00083"></a>00083 std::memcpy(&c, &bc, <span class="keyword">sizeof</span>(bc));
<a name="l00084"></a>00084 <span class="keywordflow">return</span> c;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 };
<a name="l00087"></a>00087 } <span class="comment">// namespace r123</span>
<a name="l00088"></a>00088 <span class="preprocessor">#endif</span>
</pre></div></div>
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