e12c89e8c9
Document version and how to extract sources in thirdparty/README.md. Drop unnecessary CMake and Premake files. Simplify SCsub, drop unused one.
154 lines
3.9 KiB
Common Lisp
154 lines
3.9 KiB
Common Lisp
/*
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Copyright (c) 2012 Advanced Micro Devices, Inc.
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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//Originally written by Takahiro Harada
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typedef unsigned int u32;
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#define GET_GROUP_IDX get_group_id(0)
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#define GET_LOCAL_IDX get_local_id(0)
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#define GET_GLOBAL_IDX get_global_id(0)
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#define GET_GROUP_SIZE get_local_size(0)
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#define GROUP_LDS_BARRIER barrier(CLK_LOCAL_MEM_FENCE)
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// takahiro end
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#define WG_SIZE 128
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#define m_numElems x
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#define m_numBlocks y
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#define m_numScanBlocks z
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/*typedef struct
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{
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uint m_numElems;
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uint m_numBlocks;
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uint m_numScanBlocks;
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uint m_padding[1];
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} ConstBuffer;
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*/
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u32 ScanExclusive(__local u32* data, u32 n, int lIdx, int lSize)
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{
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u32 blocksum;
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int offset = 1;
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for(int nActive=n>>1; nActive>0; nActive>>=1, offset<<=1)
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{
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GROUP_LDS_BARRIER;
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for(int iIdx=lIdx; iIdx<nActive; iIdx+=lSize)
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{
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int ai = offset*(2*iIdx+1)-1;
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int bi = offset*(2*iIdx+2)-1;
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data[bi] += data[ai];
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}
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}
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GROUP_LDS_BARRIER;
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if( lIdx == 0 )
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{
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blocksum = data[ n-1 ];
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data[ n-1 ] = 0;
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}
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GROUP_LDS_BARRIER;
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offset >>= 1;
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for(int nActive=1; nActive<n; nActive<<=1, offset>>=1 )
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{
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GROUP_LDS_BARRIER;
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for( int iIdx = lIdx; iIdx<nActive; iIdx += lSize )
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{
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int ai = offset*(2*iIdx+1)-1;
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int bi = offset*(2*iIdx+2)-1;
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u32 temp = data[ai];
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data[ai] = data[bi];
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data[bi] += temp;
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}
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}
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GROUP_LDS_BARRIER;
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return blocksum;
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}
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__attribute__((reqd_work_group_size(WG_SIZE,1,1)))
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__kernel
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void LocalScanKernel(__global u32* dst, __global u32 *src, __global u32 *sumBuffer,
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uint4 cb)
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{
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__local u32 ldsData[WG_SIZE*2];
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int gIdx = GET_GLOBAL_IDX;
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int lIdx = GET_LOCAL_IDX;
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ldsData[2*lIdx] = ( 2*gIdx < cb.m_numElems )? src[2*gIdx]: 0;
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ldsData[2*lIdx + 1] = ( 2*gIdx+1 < cb.m_numElems )? src[2*gIdx + 1]: 0;
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u32 sum = ScanExclusive(ldsData, WG_SIZE*2, GET_LOCAL_IDX, GET_GROUP_SIZE);
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if( lIdx == 0 ) sumBuffer[GET_GROUP_IDX] = sum;
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if( (2*gIdx) < cb.m_numElems )
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{
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dst[2*gIdx] = ldsData[2*lIdx];
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}
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if( (2*gIdx + 1) < cb.m_numElems )
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{
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dst[2*gIdx + 1] = ldsData[2*lIdx + 1];
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}
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}
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__attribute__((reqd_work_group_size(WG_SIZE,1,1)))
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__kernel
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void AddOffsetKernel(__global u32 *dst, __global u32 *blockSum, uint4 cb)
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{
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const u32 blockSize = WG_SIZE*2;
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int myIdx = GET_GROUP_IDX+1;
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int lIdx = GET_LOCAL_IDX;
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u32 iBlockSum = blockSum[myIdx];
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int endValue = min((myIdx+1)*(blockSize), cb.m_numElems);
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for(int i=myIdx*blockSize+lIdx; i<endValue; i+=GET_GROUP_SIZE)
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{
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dst[i] += iBlockSum;
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}
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}
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__attribute__((reqd_work_group_size(WG_SIZE,1,1)))
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__kernel
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void TopLevelScanKernel(__global u32* dst, uint4 cb)
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{
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__local u32 ldsData[2048];
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int gIdx = GET_GLOBAL_IDX;
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int lIdx = GET_LOCAL_IDX;
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int lSize = GET_GROUP_SIZE;
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for(int i=lIdx; i<cb.m_numScanBlocks; i+=lSize )
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{
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ldsData[i] = (i<cb.m_numBlocks)? dst[i]:0;
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}
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GROUP_LDS_BARRIER;
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u32 sum = ScanExclusive(ldsData, cb.m_numScanBlocks, GET_LOCAL_IDX, GET_GROUP_SIZE);
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for(int i=lIdx; i<cb.m_numBlocks; i+=lSize )
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{
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dst[i] = ldsData[i];
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}
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if( gIdx == 0 )
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{
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dst[cb.m_numBlocks] = sum;
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}
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}
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