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117 行
9.2 KiB
117 行
9.2 KiB
#ifndef __SORTINGCOMPUTEUTILS_H__
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#define __SORTINGCOMPUTEUTILS_H__
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unsigned int LimitPow2AndClamp(unsigned int value_in, unsigned int maxValue)
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{
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#if 0
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unsigned int value = 1;
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while(value<value_in && (value<<1)<=maxValue)
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value<<=1;
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return value_in==0 ? 0 : value;
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#else
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uint valpw2 = value_in==0 ? 0 : (1<<firstbithigh(value_in)); // firstbithigh(0) returns -1
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valpw2 = max(valpw2, valpw2<<(valpw2!=value_in ? 1 : 0)); // max() just in case of overflow
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return min(valpw2, maxValue);
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#endif
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}
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// have to make this sort routine a macro unfortunately because hlsl doesn't take
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// groupshared memory of unspecified length as an input parameter to a function.
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// maxcapacity_in must be a power of two.
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// all data from length_in and up to closest power of two will be filled with 0xffffffff
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#define SORTLIST(data, length_in, maxcapacity_in, localThreadID_in, nrthreads_in) \
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{ \
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int length=(int) length_in, maxcapacity=(int) maxcapacity_in, localThreadID=(int) localThreadID_in, nrthreads=(int) nrthreads_in; \
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\
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const int N = (const int) LimitPow2AndClamp((unsigned int) length, (uint) maxcapacity); \
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for(int t=length+localThreadID; t<N; t+=nrthreads) { data[t]=0xffffffff; } \
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GroupMemoryBarrierWithGroupSync(); \
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\
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for(int k=2; k<=N; k=2*k) \
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{ \
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for(int j=k>>1; j>0; j=j>>1) \
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{ \
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for(int i=localThreadID; i<N; i+=nrthreads) \
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{ \
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int ixj=i^j; \
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if((ixj)>i) \
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{ \
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const unsigned int Avalue = data[i]; \
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const unsigned int Bvalue = data[ixj]; \
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\
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const bool mustSwap = ((i&k)!=0^(Avalue>Bvalue)) && Avalue!=Bvalue; \
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if(mustSwap) \
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{ \
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data[i]=Bvalue; \
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data[ixj]=Avalue; \
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} \
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} \
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} \
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\
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GroupMemoryBarrierWithGroupSync(); \
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} \
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} \
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}
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// have to make this sort routine a macro unfortunately because hlsl doesn't take
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// groupshared memory of unspecified length as an input parameter to a function.
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// merge-sort is not in-place so two buffers are required: data and tmpdata.
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// These must both have a capacity of at least length_in entries and initial
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// input is assumed to be in data and results will be delivered in data.
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#define MERGESORTLIST(data, tmpdata, length_in, localThreadID_in, nrthreads_in) \
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{ \
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int length=(int) length_in, localThreadID=(int) localThreadID_in, nrthreads=(int) nrthreads_in; \
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\
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for(int curr_size=1; curr_size<=length-1; curr_size = 2*curr_size) \
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{ \
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for(int left_start=localThreadID*(2*curr_size); left_start<(length-1); left_start+=nrthreads*(2*curr_size)) \
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{ \
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int mid = left_start + curr_size - 1; \
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int right_end = min(left_start + 2*curr_size - 1, length-1); \
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{ \
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int l=left_start, m=mid, r=right_end; \
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\
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int i, j, k; \
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\
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int ol = l; \
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int or = m+1; \
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int sl = m - l + 1; \
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int sr = r - m; \
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\
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for(int i=l; i<=r; i++) tmpdata[i] = data[i]; \
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\
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i = 0; j = 0; k = l; \
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while (i < sl && j < sr) \
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{ \
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const uint lVal = tmpdata[ol+i]; \
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const uint rVal = tmpdata[or+j]; \
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bool pickLeft = lVal <= rVal; \
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i = pickLeft ? (i+1) : i; \
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j = pickLeft ? j : (j+1); \
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data[k] = pickLeft ? lVal : rVal; \
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k++; \
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} \
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\
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while (i < sl) \
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{ \
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data[k] = tmpdata[ol+i]; \
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i++; k++; \
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} \
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\
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while (j < sr) \
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{ \
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data[k] = tmpdata[or+j]; \
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j++; k++; \
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} \
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} \
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} \
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\
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GroupMemoryBarrierWithGroupSync(); \
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} \
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}
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#endif
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