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80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
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/* Copyright (c) 2021, NVIDIA CORPORATION. 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
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MONTECARLO_REDUCTION_CUH
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#define MONTECARLO_REDUCTION_CUH
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#include <cooperative_groups.h>
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namespace cg = cooperative_groups;
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////////////////////////////////////////////////////////////////////////////////
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// This function calculates total sum for each of the two input arrays.
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// SUM_N must be power of two
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// Unrolling provides a bit of a performance improvement for small
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// to medium path counts.
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////////////////////////////////////////////////////////////////////////////////
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template <class T, int SUM_N, int blockSize>
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__device__ void sumReduce(T *sum, T *sum2, cg::thread_block &cta,
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cg::thread_block_tile<32> &tile32,
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__TOptionValue *d_CallValue) {
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const int VEC = 32;
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const int tid = cta.thread_rank();
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T beta = sum[tid];
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T beta2 = sum2[tid];
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T temp, temp2;
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for (int i = VEC / 2; i > 0; i >>= 1) {
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if (tile32.thread_rank() < i) {
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temp = sum[tid + i];
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temp2 = sum2[tid + i];
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beta += temp;
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beta2 += temp2;
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sum[tid] = beta;
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sum2[tid] = beta2;
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}
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cg::sync(tile32);
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}
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cg::sync(cta);
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if (tid == 0) {
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beta = 0;
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beta2 = 0;
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for (int i = 0; i < blockDim.x; i += VEC) {
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beta += sum[i];
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beta2 += sum2[i];
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}
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__TOptionValue t = {beta, beta2};
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*d_CallValue = t;
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}
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cg::sync(cta);
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}
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#endif
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