Aditya Atluri
78 lines
3.3 KiB
C++
78 lines
3.3 KiB
C++
/*
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Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <iostream>
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#include <hip_runtime.h>
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#define HIP_ASSERT(x) (assert((x)==hipSuccess))
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__global__ void
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gpu_ballot(hipLaunchParm lp, unsigned int* device_ballot, int Num_Warps_per_Block,int pshift)
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{
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int tid = hipThreadIdx_x + hipBlockIdx_x * hipBlockDim_x;
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const unsigned int warp_num = hipThreadIdx_x >> pshift;
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#ifdef __HIP_PLATFORM_HCC__
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atomicAdd(&device_ballot[warp_num+hipBlockIdx_x*Num_Warps_per_Block],__popcll(__ballot(tid - 245)));
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#else
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atomicAdd(&device_ballot[warp_num+hipBlockIdx_x*Num_Warps_per_Block],__popc(__ballot(tid - 245)));
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#endif
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}
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int main(int argc, char *argv[])
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{ int warpSize, pshift;
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hipDeviceProp_t devProp;
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hipGetDeviceProperties(&devProp, 0);
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if(strncmp(devProp.name,"Fiji",1)==0)
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{warpSize = 64; pshift =6;}
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else {warpSize =32; pshift =5;}
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unsigned int Num_Threads_per_Block = 512;
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unsigned int Num_Blocks_per_Grid = 1;
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unsigned int Num_Warps_per_Block = Num_Threads_per_Block/warpSize;
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unsigned int Num_Warps_per_Grid = (Num_Threads_per_Block*Num_Blocks_per_Grid)/warpSize;
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unsigned int* host_ballot = (unsigned int*)malloc(Num_Warps_per_Grid*sizeof(unsigned int));
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unsigned int* device_ballot;
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HIP_ASSERT(hipMalloc((void**)&device_ballot, Num_Warps_per_Grid*sizeof(unsigned int)));
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int divergent_count =0;
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for (int i=0; i<Num_Warps_per_Grid; i++) host_ballot[i] = 0;
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HIP_ASSERT(hipMemcpy(device_ballot, host_ballot, Num_Warps_per_Grid*sizeof(unsigned int), hipMemcpyHostToDevice));
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hipLaunchKernel(gpu_ballot, dim3(Num_Blocks_per_Grid),dim3(Num_Threads_per_Block),0,0, device_ballot,Num_Warps_per_Block,pshift);
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HIP_ASSERT(hipMemcpy(host_ballot, device_ballot, Num_Warps_per_Grid*sizeof(unsigned int), hipMemcpyDeviceToHost));
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for (int i=0; i<Num_Warps_per_Grid; i++) {
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if ((host_ballot[i] == 0)||(host_ballot[i]/warpSize == warpSize)) std::cout << "Warp " << i << " IS convergent- Predicate true for " << host_ballot[i]/warpSize << " threads\n";
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else {std::cout << " Warp " << i << " IS divergent - Predicate true for " << host_ballot[i]/warpSize<< " threads\n";
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divergent_count++;}
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}
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if (divergent_count==1) printf("PASSED\n"); else printf("FAILED\n");
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return EXIT_SUCCESS;
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}
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