126 lines
4.2 KiB
C++
126 lines
4.2 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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#include <stdlib.h> // Needed for rand().
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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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double GetDouble();
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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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inline RandomWELL512a_SSE2::RandomWELL512a_SSE2(int seed)
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: index(0)
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, resultIndex(4)
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{
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srand(seed);
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for (int i = 0; i < 16; ++i)
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xmm_state[i] = _mm_set_epi32(rand(), rand(), rand(), rand());
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}
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inline RandomWELL512a_SSE2::RandomWELL512a_SSE2(unsigned *seed)
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: index(0)
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, resultIndex(4)
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{
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for (int i = 0; i < 16; ++i)
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xmm_state[i] = _mm_set_epi32(seed[i + 48], seed[i + 32], seed[i + 16], seed[i]);
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}
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inline unsigned RandomWELL512a_SSE2::GetUnsigned()
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{
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if (resultIndex >= 4)
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{
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GetUnsigned4(result);
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resultIndex = 0;
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}
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return result[resultIndex++];
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}
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inline double RandomWELL512a_SSE2::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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inline void RandomWELL512a_SSE2::GetUnsigned4(unsigned *result4)
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{
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unsigned index_15 = (index + 15) & 15;
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__m128i state_index = xmm_state[index];
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__m128i state_index_9 = xmm_state[(index + 9) & 15];
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__m128i state_index_13 = xmm_state[(index + 13) & 15];
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__m128i state_index_15 = xmm_state[index_15];
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const __m128i kMix = _mm_set1_epi32(0xda442d24);
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__m128i left = _mm_xor_si128(state_index, _mm_slli_epi32(state_index, 16));
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__m128i right = _mm_xor_si128(state_index_13, _mm_slli_epi32(state_index_13, 15));
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__m128i z1 = _mm_xor_si128(left, right);
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__m128i z2 = _mm_xor_si128(state_index_9, _mm_srli_epi32(state_index_9, 11));
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__m128i result0 = _mm_xor_si128(z1, z2);
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xmm_state[index] = result0;
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__m128i result1 = _mm_xor_si128(state_index_15, _mm_slli_epi32(state_index_15, 2));
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result1 = _mm_xor_si128(result1, _mm_xor_si128(z1, _mm_slli_epi32(z1, 18)));
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result1 = _mm_xor_si128(result1, _mm_slli_epi32(z2, 28));
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result1 = _mm_xor_si128(result1, _mm_xor_si128(result0, _mm_and_si128(_mm_slli_epi32(result0, 5), kMix)));
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index = index_15;
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xmm_state[index] = result1;
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_mm_storeu_si128((__m128i *)result4, result1);
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}
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inline void RandomWELL512a_SSE2::GetDouble4(double *result4)
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{
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unsigned unsignedResult[4];
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GetUnsigned4(unsignedResult);
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const double kToFloat = 2.32830643653869628906e-10;
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for (unsigned loop = 0; loop < 4; ++loop)
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result4[loop] = unsignedResult[loop] * kToFloat;
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}
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#endif // RANDOM_WELL512A_SSE2_H
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