69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// Copyright (c) 2013, Peter Pettersson
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// The views and conclusions contained in the software and documentation are those
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// of the authors and should not be interpreted as representing official policies,
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// either expressed or implied, of the FreeBSD Project.
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#ifndef RANDOM_WELL512A_SSE2_H
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#define RANDOM_WELL512A_SSE2_H
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#include <emmintrin.h> // SSE2 instrinsics.
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class RandomWELL512a_SSE2
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{
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public:
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RandomWELL512a_SSE2(int seed);
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RandomWELL512a_SSE2(unsigned *seed);
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unsigned GetUnsigned()
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{
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if (resultIndex < 4)
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return result[resultIndex++];
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GetUnsigned4(result);
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resultIndex = 1;
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return result[0];
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}
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double GetDouble()
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{
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const double kToFloat = 2.32830643653869628906e-10;
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return GetUnsigned() * kToFloat;
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}
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void GetUnsigned4(unsigned *result4);
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void GetDouble4(double *result4);
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private:
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__m128i xmm_state[16];
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unsigned index;
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// Helper to allow us to return one number per call.
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unsigned result[4];
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unsigned resultIndex;
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};
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#endif // RANDOM_WELL512A_SSE2_H
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