295 lines
10 KiB
Plaintext
295 lines
10 KiB
Plaintext
/*
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* Copyright 1993-2010 NVIDIA Corporation. All rights reserved.
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*
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* Please refer to the NVIDIA end user license agreement (EULA) associated
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* with this source code for terms and conditions that govern your use of
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* this software. Any use, reproduction, disclosure, or distribution of
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* this software and related documentation outside the terms of the EULA
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* is strictly prohibited.
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*
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*/
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//Based on http://www.iti.fh-flensburg.de/lang/algorithmen/sortieren/bitonic/bitonicen.htm
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#include <assert.h>
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#include <cutil_inline.h>
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#include "sortingNetworks_common.h"
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#include "sortingNetworks_common.cuh"
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////////////////////////////////////////////////////////////////////////////////
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// Monolithic bitonic sort kernel for short arrays fitting into shared memory
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////////////////////////////////////////////////////////////////////////////////
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__global__ void bitonicSortShared(
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uint *d_DstKey,
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uint *d_DstVal,
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uint *d_SrcKey,
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uint *d_SrcVal,
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uint arrayLength,
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uint dir
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){
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//Shared memory storage for one or more short vectors
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__shared__ uint s_key[SHARED_SIZE_LIMIT];
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__shared__ uint s_val[SHARED_SIZE_LIMIT];
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//Offset to the beginning of subbatch and load data
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d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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s_key[threadIdx.x + 0] = d_SrcKey[ 0];
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s_val[threadIdx.x + 0] = d_SrcVal[ 0];
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s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
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s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
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for(uint size = 2; size < arrayLength; size <<= 1){
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//Bitonic merge
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uint ddd = dir ^ ( (threadIdx.x & (size / 2)) != 0 );
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for(uint stride = size / 2; stride > 0; stride >>= 1){
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__syncthreads();
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uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
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Comparator(
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s_key[pos + 0], s_val[pos + 0],
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s_key[pos + stride], s_val[pos + stride],
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ddd
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);
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}
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}
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//ddd == dir for the last bitonic merge step
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{
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for(uint stride = arrayLength / 2; stride > 0; stride >>= 1){
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__syncthreads();
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uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
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Comparator(
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s_key[pos + 0], s_val[pos + 0],
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s_key[pos + stride], s_val[pos + stride],
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dir
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);
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}
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}
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__syncthreads();
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d_DstKey[ 0] = s_key[threadIdx.x + 0];
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d_DstVal[ 0] = s_val[threadIdx.x + 0];
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d_DstKey[(SHARED_SIZE_LIMIT / 2)] = s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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d_DstVal[(SHARED_SIZE_LIMIT / 2)] = s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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}
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////////////////////////////////////////////////////////////////////////////////
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// Bitonic sort kernel for large arrays (not fitting into shared memory)
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////////////////////////////////////////////////////////////////////////////////
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//Bottom-level bitonic sort
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//Almost the same as bitonicSortShared with the exception of
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//even / odd subarrays being sorted in opposite directions
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//Bitonic merge accepts both
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//Ascending | descending or descending | ascending sorted pairs
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__global__ void bitonicSortShared1(
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uint *d_DstKey,
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uint *d_DstVal,
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uint *d_SrcKey,
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uint *d_SrcVal
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){
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//Shared memory storage for current subarray
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__shared__ uint s_key[SHARED_SIZE_LIMIT];
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__shared__ uint s_val[SHARED_SIZE_LIMIT];
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//Offset to the beginning of subarray and load data
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d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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s_key[threadIdx.x + 0] = d_SrcKey[ 0];
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s_val[threadIdx.x + 0] = d_SrcVal[ 0];
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s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
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s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
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for(uint size = 2; size < SHARED_SIZE_LIMIT; size <<= 1){
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//Bitonic merge
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uint ddd = (threadIdx.x & (size / 2)) != 0;
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for(uint stride = size / 2; stride > 0; stride >>= 1){
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__syncthreads();
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uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
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Comparator(
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s_key[pos + 0], s_val[pos + 0],
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s_key[pos + stride], s_val[pos + stride],
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ddd
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);
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}
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}
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//Odd / even arrays of SHARED_SIZE_LIMIT elements
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//sorted in opposite directions
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uint ddd = blockIdx.x & 1;
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{
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for(uint stride = SHARED_SIZE_LIMIT / 2; stride > 0; stride >>= 1){
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__syncthreads();
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uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
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Comparator(
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s_key[pos + 0], s_val[pos + 0],
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s_key[pos + stride], s_val[pos + stride],
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ddd
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);
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}
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}
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__syncthreads();
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d_DstKey[ 0] = s_key[threadIdx.x + 0];
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d_DstVal[ 0] = s_val[threadIdx.x + 0];
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d_DstKey[(SHARED_SIZE_LIMIT / 2)] = s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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d_DstVal[(SHARED_SIZE_LIMIT / 2)] = s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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}
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//Bitonic merge iteration for stride >= SHARED_SIZE_LIMIT
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__global__ void bitonicMergeGlobal(
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uint *d_DstKey,
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uint *d_DstVal,
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uint *d_SrcKey,
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uint *d_SrcVal,
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uint arrayLength,
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uint size,
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uint stride,
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uint dir
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){
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uint global_comparatorI = blockIdx.x * blockDim.x + threadIdx.x;
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uint comparatorI = global_comparatorI & (arrayLength / 2 - 1);
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//Bitonic merge
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uint ddd = dir ^ ( (comparatorI & (size / 2)) != 0 );
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uint pos = 2 * global_comparatorI - (global_comparatorI & (stride - 1));
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uint keyA = d_SrcKey[pos + 0];
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uint valA = d_SrcVal[pos + 0];
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uint keyB = d_SrcKey[pos + stride];
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uint valB = d_SrcVal[pos + stride];
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Comparator(
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keyA, valA,
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keyB, valB,
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ddd
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);
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d_DstKey[pos + 0] = keyA;
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d_DstVal[pos + 0] = valA;
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d_DstKey[pos + stride] = keyB;
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d_DstVal[pos + stride] = valB;
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}
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//Combined bitonic merge steps for
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//size > SHARED_SIZE_LIMIT and stride = [1 .. SHARED_SIZE_LIMIT / 2]
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__global__ void bitonicMergeShared(
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uint *d_DstKey,
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uint *d_DstVal,
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uint *d_SrcKey,
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uint *d_SrcVal,
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uint arrayLength,
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uint size,
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uint dir
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){
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//Shared memory storage for current subarray
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__shared__ uint s_key[SHARED_SIZE_LIMIT];
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__shared__ uint s_val[SHARED_SIZE_LIMIT];
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d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
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s_key[threadIdx.x + 0] = d_SrcKey[ 0];
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s_val[threadIdx.x + 0] = d_SrcVal[ 0];
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s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
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s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] = d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
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//Bitonic merge
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uint comparatorI = UMAD(blockIdx.x, blockDim.x, threadIdx.x) & ((arrayLength / 2) - 1);
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uint ddd = dir ^ ( (comparatorI & (size / 2)) != 0 );
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for(uint stride = SHARED_SIZE_LIMIT / 2; stride > 0; stride >>= 1){
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__syncthreads();
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uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
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Comparator(
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s_key[pos + 0], s_val[pos + 0],
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s_key[pos + stride], s_val[pos + stride],
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ddd
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);
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}
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__syncthreads();
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d_DstKey[ 0] = s_key[threadIdx.x + 0];
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d_DstVal[ 0] = s_val[threadIdx.x + 0];
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d_DstKey[(SHARED_SIZE_LIMIT / 2)] = s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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d_DstVal[(SHARED_SIZE_LIMIT / 2)] = s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
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}
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////////////////////////////////////////////////////////////////////////////////
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// Interface function
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////////////////////////////////////////////////////////////////////////////////
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//Helper function (also used by odd-even merge sort)
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extern "C" uint factorRadix2(uint *log2L, uint L){
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if(!L){
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*log2L = 0;
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return 0;
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}else{
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for(*log2L = 0; (L & 1) == 0; L >>= 1, *log2L++);
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return L;
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}
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}
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extern "C" uint bitonicSort(
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uint *d_DstKey,
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uint *d_DstVal,
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uint *d_SrcKey,
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uint *d_SrcVal,
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uint batchSize,
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uint arrayLength,
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uint dir
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){
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//Nothing to sort
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if(arrayLength < 2)
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return 0;
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//Only power-of-two array lengths are supported by this implementation
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uint log2L;
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uint factorizationRemainder = factorRadix2(&log2L, arrayLength);
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assert( factorizationRemainder == 1 );
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dir = (dir != 0);
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uint blockCount = batchSize * arrayLength / SHARED_SIZE_LIMIT;
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uint threadCount = SHARED_SIZE_LIMIT / 2;
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if(arrayLength <= SHARED_SIZE_LIMIT){
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assert( (batchSize * arrayLength) % SHARED_SIZE_LIMIT == 0 );
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bitonicSortShared<<<blockCount, threadCount>>>(d_DstKey, d_DstVal, d_SrcKey, d_SrcVal, arrayLength, dir);
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}else{
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bitonicSortShared1<<<blockCount, threadCount>>>(d_DstKey, d_DstVal, d_SrcKey, d_SrcVal);
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for(uint size = 2 * SHARED_SIZE_LIMIT; size <= arrayLength; size <<= 1)
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for(unsigned stride = size / 2; stride > 0; stride >>= 1)
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if(stride >= SHARED_SIZE_LIMIT){
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bitonicMergeGlobal<<<(batchSize * arrayLength) / 512, 256>>>(d_DstKey, d_DstVal, d_DstKey, d_DstVal, arrayLength, size, stride, dir);
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}else{
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bitonicMergeShared<<<blockCount, threadCount>>>(d_DstKey, d_DstVal, d_DstKey, d_DstVal, arrayLength, size, dir);
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break;
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}
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}
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return threadCount;
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}
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extern "C" int isDeviceEmulation(void){
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#ifdef __DEVICE_EMULATION__
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return 1;
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#else
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return 0;
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#endif
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}
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