rocm-systems/tests/src/hipDynamicShared.cpp

/*
Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.

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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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*/

#include <hip_runtime.h>
#include "test_common.h"

template<typename T>
__global__ void testExternSharedKernel(hipLaunchParm lp, const T* A_d, const T* B_d, T* C_d, size_t numElements, size_t groupElements) {

    // declare dynamic shared memory
    HIP_DYNAMIC_SHARED(T, sdata)

    size_t gid = (hipBlockIdx_x * hipBlockDim_x + hipThreadIdx_x);
    size_t tid = hipThreadIdx_x;

    // initialize dynamic shared memory
    if (tid < groupElements) {
        sdata[tid] = static_cast<T>(tid); 
    }

    // prefix sum inside dynamic shared memory
    if (groupElements >= 512) {
        if (tid >= 256) { sdata[tid] += sdata[tid - 256]; } __syncthreads();
    }
    if (groupElements >= 256) {
        if (tid >= 128) { sdata[tid] += sdata[tid - 128]; } __syncthreads();
    }
    if (groupElements >= 128) {
        if (tid >= 64) { sdata[tid] += sdata[tid - 64]; } __syncthreads();
    }
    if (groupElements >= 64) { sdata[tid] += sdata[tid - 32]; } __syncthreads();
    if (groupElements >= 32) { sdata[tid] += sdata[tid - 16]; } __syncthreads();
    if (groupElements >= 16) { sdata[tid] += sdata[tid - 8]; } __syncthreads();
    if (groupElements >= 8) { sdata[tid] += sdata[tid - 4]; } __syncthreads();
    if (groupElements >= 4) { sdata[tid] += sdata[tid - 2]; } __syncthreads();
    if (groupElements >= 2) { sdata[tid] += sdata[tid - 1]; } __syncthreads();

    C_d[gid] = A_d[gid] + B_d[gid] + sdata[tid % groupElements];
}

template<typename T>
void testExternShared(size_t N, size_t groupElements) {
    size_t Nbytes = N * sizeof(T);

    T *A_d, *B_d, *C_d;
    T *A_h, *B_h, *C_h;

    HipTest::initArrays(&A_d, &B_d, &C_d, &A_h, &B_h, &C_h, N, false);
    unsigned blocks = HipTest::setNumBlocks(blocksPerCU, threadsPerBlock, N);

    //printf("blocksPerCU: %d\nthreadsPerBlock: %d\nN: %zu\n", blocksPerCU, threadsPerBlock, N);

    HIPCHECK(hipMemcpy(A_d, A_h, Nbytes, hipMemcpyHostToDevice));
    HIPCHECK(hipMemcpy(B_d, B_h, Nbytes, hipMemcpyHostToDevice));

    // calculate the amount of dynamic shared memory required
    size_t groupMemBytes = groupElements * sizeof(T);

    // launch kernel with dynamic shared memory
    hipLaunchKernel(HIP_KERNEL_NAME(testExternSharedKernel<T>), dim3(blocks), dim3(threadsPerBlock), groupMemBytes, 0, A_d, B_d, C_d, N, groupElements);

    HIPCHECK(hipDeviceSynchronize());

    HIPCHECK(hipMemcpy(C_h, C_d, Nbytes, hipMemcpyDeviceToHost));

    // verify
    for (size_t i = 0; i < N; ++i) {
        size_t tid = (i % groupElements);
        T sumFromSharedMemory = static_cast<T>(tid * (tid + 1) / 2);
        T expected = A_h[i] + B_h[i] + sumFromSharedMemory;
        if (C_h[i] != expected) {
           std::cout << std::fixed << std::setprecision(32);
           std::cout << "At " << i << std::endl;
           std::cout << "  Computed:" << C_h[i] << std::endl;
           std::cout << "  Expected:" << expected << std::endl;
           std::cout << sumFromSharedMemory << std::endl;
           std::cout << A_h[i] << std::endl;
           std::cout << B_h[i] << std::endl;

           failed("Failed at index:%zu\n", i);
        }
    }

    HipTest::freeArrays(A_d, B_d, C_d, A_h, B_h, C_h, false);
}

int main(int argc, char *argv[]) {
    HipTest::parseStandardArguments(argc, argv, true);

    //printf("info: set device to %d\n", p_gpuDevice);
    HIPCHECK(hipSetDevice(p_gpuDevice));

    testExternShared<float>(1024, 4);
    testExternShared<float>(1024, 8);
    testExternShared<float>(1024, 16);
    testExternShared<float>(1024, 32);
    testExternShared<float>(1024, 64);

    testExternShared<float>(65536, 4);
    testExternShared<float>(65536, 8);
    testExternShared<float>(65536, 16);
    testExternShared<float>(65536, 32);
    testExternShared<float>(65536, 64);

    testExternShared<double>(1024, 4);
    testExternShared<double>(1024, 8);
    testExternShared<double>(1024, 16);
    testExternShared<double>(1024, 32);
    testExternShared<double>(1024, 64);

    testExternShared<double>(65536, 4);
    testExternShared<double>(65536, 8);
    testExternShared<double>(65536, 16);
    testExternShared<double>(65536, 32);
    testExternShared<double>(65536, 64);

    passed();
}