rocm-systems/tests/src/kernel/hipDynamicShared.cpp

/*
Copyright (c) 2015-2017 Advanced Micro Devices, Inc. All rights reserved.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/

/* HIT_START
 * BUILD: %t %s ../test_common.cpp
 * TEST: %t EXCLUDE_HIP_PLATFORM nvidia
 * HIT_END
 */

#include "hip/hip_runtime.h"
#include "test_common.h"

template <unsigned batch, typename T>
__device__ void sum(T* sdata, unsigned groupElements, unsigned tid) {
    T tmp;
    if (groupElements < batch)
        return;
    // sdata[tid] += sdata[tid - batch/2] does not work when block size is
    // greater than wave size because one wave may complete before another
    // wave.
    if (tid >= batch/2 && tid < groupElements)
        tmp = sdata[tid - batch/2];
    __syncthreads();
    if (tid >= batch/2 && tid < groupElements)
        sdata[tid] += tmp;
    __syncthreads();
}

template <typename T>
__global__ void testExternSharedKernel(const T* A_d, const T* B_d, T* C_d,
                                       size_t numElements, size_t groupElements) {
    // declare dynamic shared memory
#if defined(__HIP_PLATFORM_AMD__)
    HIP_DYNAMIC_SHARED(T, sdata)
#else
    HIP_DYNAMIC_SHARED(__align__(sizeof(T)) unsigned char, my_sdata)
    T* sdata = reinterpret_cast<T*>(my_sdata);
#endif

    size_t gid = (blockIdx.x * blockDim.x + threadIdx.x);
    size_t tid = threadIdx.x;

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

    // prefix sum inside dynamic shared memory
    sum<512>(sdata, groupElements, tid);
    sum<256>(sdata, groupElements, tid);
    sum<128>(sdata, groupElements, tid);
    sum<64>(sdata, groupElements, tid);
    sum<32>(sdata, groupElements, tid);
    sum<16>(sdata, groupElements, tid);
    sum<8>(sdata, groupElements, tid);
    sum<4>(sdata, groupElements, tid);
    sum<2>(sdata, groupElements, tid);
    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 = N/threadsPerBlock;
    assert(N == blocks * threadsPerBlock);

    // printf("blocks: %d\nthreadsPerBlock: %d\nN: %zu\n", blocks, 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
    hipLaunchKernelGGL(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 % min(threadsPerBlock, 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();
}