89 lines
3.5 KiB
C++
89 lines
3.5 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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#include "RandomWELL512a_SSE2.h"
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#include <stdlib.h> // Needed for rand().
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#include <memory.h> // Needed for memcpy().
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RandomWELL512a_SSE2::RandomWELL512a_SSE2(int seed)
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: index(0)
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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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RandomWELL512a_SSE2::RandomWELL512a_SSE2(unsigned *seed)
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: index(0)
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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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void RandomWELL512a_SSE2::GetUnsigned4(unsigned *result4)
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{
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// Calculations.
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#define MUTATE_LEFT(value, shift) _mm_xor_si128(value, _mm_slli_epi32(value, shift))
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#define MUTATE_RIGHT(value, shift) _mm_xor_si128(value, _mm_srli_epi32(value, shift))
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#define MUTATE_LEFT_MIX(value, shift, mix) _mm_xor_si128(value, _mm_and_si128(_mm_slli_epi32(value, shift), mix))
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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 z1 = _mm_xor_si128(MUTATE_LEFT(state_index, 16), MUTATE_LEFT(state_index_13, 15));
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__m128i z2 = MUTATE_RIGHT(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 = MUTATE_LEFT(state_index_15, 2);
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result1 = _mm_xor_si128(result1, MUTATE_LEFT(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, MUTATE_LEFT_MIX(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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#undef MUTATE_LEFT
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#undef MUTATE_RIGHT
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#undef MUTATE_LEFT_MIX
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}
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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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