agunashe
86 righe
3.4 KiB
C++
86 righe
3.4 KiB
C++
/*
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Copyright (c) 2021 - 2021 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 <hip_test_common.hh>
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#include <hip/device_functions.h>
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__global__ void gpu_ballot(unsigned int* device_ballot, unsigned Num_Warps_per_Block,
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unsigned pshift) {
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int tid = threadIdx.x + blockIdx.x * blockDim.x;
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const unsigned int warp_num = threadIdx.x >> pshift;
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// TODO try to remove this
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#ifdef __HIP_PLATFORM_AMD__
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atomicAdd(&device_ballot[warp_num + blockIdx.x * Num_Warps_per_Block],
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__popcll(__ballot(tid - 245)));
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#else
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atomicAdd(&device_ballot[warp_num + blockIdx.x * Num_Warps_per_Block],
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__popc(__ballot(tid - 245)));
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#endif
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}
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TEST_CASE("Unit_ballot") {
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unsigned warpSize, pshift;
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hipDeviceProp_t devProp;
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HIP_CHECK(hipGetDeviceProperties(&devProp, 0));
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warpSize = devProp.warpSize;
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int w = warpSize;
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pshift = 0;
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while (w >>= 1) ++pshift;
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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_CHECK(hipMalloc((void**)&device_ballot, Num_Warps_per_Grid * sizeof(unsigned int)));
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int divergent_count = 0;
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for (unsigned i = 0; i < Num_Warps_per_Grid; i++) host_ballot[i] = 0;
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HIP_CHECK(hipMemcpy(device_ballot, host_ballot, Num_Warps_per_Grid * sizeof(unsigned int),
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hipMemcpyHostToDevice));
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hipLaunchKernelGGL(gpu_ballot, dim3(Num_Blocks_per_Grid), dim3(Num_Threads_per_Block), 0, 0,
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device_ballot, Num_Warps_per_Block, pshift);
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HIP_CHECK(hipMemcpy(host_ballot, device_ballot, Num_Warps_per_Grid * sizeof(unsigned int),
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hipMemcpyDeviceToHost));
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for (unsigned i = 0; i < Num_Warps_per_Grid; i++) {
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if ((host_ballot[i] == 0) || (host_ballot[i] / warpSize == warpSize)) {
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INFO("Warp: " << i << " is convergent - predicate true for " << (host_ballot[i] / warpSize)
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<< " threads");
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} else {
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INFO("Warp: " << i << " is divergent - predicate true for " << (host_ballot[i] / warpSize)
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<< " threads");
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divergent_count++;
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}
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}
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HIP_CHECK(hipFree(device_ballot));
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REQUIRE(divergent_count == 1);
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}
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