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114 lines
3.5 KiB
Plaintext
114 lines
3.5 KiB
Plaintext
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Demonstration of inline PTX (assembly language) usage in CUDA kernels
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*/
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// System includes
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#include <stdio.h>
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#include <assert.h>
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// CUDA runtime
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#include <cuda_runtime.h>
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// helper functions and utilities to work with CUDA
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#include <helper_functions.h>
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#include <helper_cuda.h>
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__global__ void sequence_gpu(int *d_ptr, int length)
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{
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int elemID = blockIdx.x * blockDim.x + threadIdx.x;
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if (elemID < length)
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{
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unsigned int laneid;
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//This command gets the lane ID within the current warp
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asm("mov.u32 %0, %%laneid;" : "=r"(laneid));
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d_ptr[elemID] = laneid;
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}
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}
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void sequence_cpu(int *h_ptr, int length)
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{
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for (int elemID=0; elemID<length; elemID++)
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{
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h_ptr[elemID] = elemID % 32;
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}
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}
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int main(int argc, char **argv)
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{
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printf("CUDA inline PTX assembler sample\n");
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const int N = 1000;
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int dev = findCudaDevice(argc, (const char **) argv);
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if (dev == -1)
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{
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return EXIT_FAILURE;
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}
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int *d_ptr;
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checkCudaErrors(cudaMalloc(&d_ptr, N * sizeof(int)));
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int *h_ptr;
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checkCudaErrors(cudaMallocHost(&h_ptr, N * sizeof(int)));
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dim3 cudaBlockSize(256,1,1);
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dim3 cudaGridSize((N + cudaBlockSize.x - 1) / cudaBlockSize.x, 1, 1);
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sequence_gpu<<<cudaGridSize, cudaBlockSize>>>(d_ptr, N);
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checkCudaErrors(cudaGetLastError());
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checkCudaErrors(cudaDeviceSynchronize());
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sequence_cpu(h_ptr, N);
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int *h_d_ptr;
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checkCudaErrors(cudaMallocHost(&h_d_ptr, N *sizeof(int)));
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checkCudaErrors(cudaMemcpy(h_d_ptr, d_ptr, N *sizeof(int), cudaMemcpyDeviceToHost));
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bool bValid = true;
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for (int i=0; i<N && bValid; i++)
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{
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if (h_ptr[i] != h_d_ptr[i])
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{
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bValid = false;
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}
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}
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printf("Test %s.\n", bValid ? "Successful" : "Failed");
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checkCudaErrors(cudaFree(d_ptr));
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checkCudaErrors(cudaFreeHost(h_ptr));
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checkCudaErrors(cudaFreeHost(h_d_ptr));
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return bValid ? EXIT_SUCCESS: EXIT_FAILURE;
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}
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