random_well512a_simd/RandomWELL512a_SSE2.h

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2013-04-20 17:56:34 +00:00
// Copyright (c) 2013, Peter Pettersson
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
#ifndef RANDOM_WELL512A_SSE2_H
#define RANDOM_WELL512A_SSE2_H
#include <emmintrin.h> // SSE2 instrinsics.
class RandomWELL512a_SSE2
{
public:
RandomWELL512a_SSE2(int seed);
RandomWELL512a_SSE2(unsigned *seed);
unsigned GetUnsigned()
{
if (resultIndex < 4)
return result[resultIndex++];
GetUnsigned4(result);
resultIndex = 1;
return result[0];
}
double GetDouble()
{
const double kToFloat = 2.32830643653869628906e-10;
return GetUnsigned() * kToFloat;
}
void GetUnsigned4(unsigned *result4);
void GetDouble4(double *result4);
private:
__m128i xmm_state[16];
unsigned index;
// Helper to allow us to return one number per call.
unsigned result[4];
unsigned resultIndex;
};
#endif // RANDOM_WELL512A_SSE2_H