TheRock/rocm-libraries/projects/rocsparse/clients/samples/example_dotci.cpp

/*! \file */
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 * furnished to do so, subject to the following conditions:
 *
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 * all copies or substantial portions of the Software.
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#include "rocsparse/rocsparse.h"
#include <hip/hip_runtime_api.h>
#include <iostream>

#define HIP_CHECK(stat)                                                        \
    {                                                                          \
        if(stat != hipSuccess)                                                 \
        {                                                                      \
            std::cerr << "Error: hip error in line " << __LINE__ << std::endl; \
            return -1;                                                         \
        }                                                                      \
    }

#define ROCSPARSE_CHECK(stat)                                                        \
    {                                                                                \
        if(stat != rocsparse_status_success)                                         \
        {                                                                            \
            std::cerr << "Error: rocsparse error in line " << __LINE__ << std::endl; \
            return -1;                                                               \
        }                                                                            \
    }

int main(int argc, char* argv[])
{
    // Query device
    int ndev;
    HIP_CHECK(hipGetDeviceCount(&ndev));

    if(ndev < 1)
    {
        std::cerr << "No HIP device found" << std::endl;
        return -1;
    }

    // Query device properties
    hipDeviceProp_t prop;
    HIP_CHECK(hipGetDeviceProperties(&prop, 0));

    std::cout << "Device: " << prop.name << std::endl;

    // rocSPARSE handle
    rocsparse_handle handle;
    ROCSPARSE_CHECK(rocsparse_create_handle(&handle));

    // Print rocSPARSE version and revision
    int  ver;
    char rev[64];

    ROCSPARSE_CHECK(rocsparse_get_version(handle, &ver));
    ROCSPARSE_CHECK(rocsparse_get_git_rev(handle, rev));

    std::cout << "rocSPARSE version: " << ver / 100000 << "." << ver / 100 % 1000 << "."
              << ver % 100 << "-" << rev << std::endl;

    // Input data

    // Number of non-zeros of the sparse vector
    rocsparse_int nnz = 3;

    // Sparse index vector
    rocsparse_int hx_ind[3] = {0, 3, 5};

    // Sparse value vector
    rocsparse_float_complex hx_val[3] = {{1.0, 4.0}, {2.0, 5.0}, {3.0, 6.0}};

    // Dense vector
    rocsparse_float_complex hy[9] = {{1.0, -9.0},
                                     {2.0, -8.0},
                                     {3.0, -7.0},
                                     {4.0, -6.0},
                                     {5.0, -5.0},
                                     {6.0, -4.0},
                                     {7.0, -3.0},
                                     {8.0, -2.0},
                                     {9.0, -1.0}};

    // Index base
    rocsparse_index_base idx_base = rocsparse_index_base_zero;

    // Offload data to device
    rocsparse_int*           dx_ind;
    rocsparse_float_complex* dx_val;
    rocsparse_float_complex* dy;

    HIP_CHECK(hipMalloc((void**)&dx_ind, sizeof(rocsparse_int) * nnz));
    HIP_CHECK(hipMalloc((void**)&dx_val, sizeof(rocsparse_float_complex) * nnz));
    HIP_CHECK(hipMalloc((void**)&dy, sizeof(rocsparse_float_complex) * 9));

    HIP_CHECK(hipMemcpy(dx_ind, hx_ind, sizeof(rocsparse_int) * nnz, hipMemcpyHostToDevice));
    HIP_CHECK(
        hipMemcpy(dx_val, hx_val, sizeof(rocsparse_float_complex) * nnz, hipMemcpyHostToDevice));
    HIP_CHECK(hipMemcpy(dy, hy, sizeof(rocsparse_float_complex) * 9, hipMemcpyHostToDevice));

    // Call cdotci to compute the dot product of a complex conjugate sparse vector
    // with a dense vector
    rocsparse_float_complex dot;
    ROCSPARSE_CHECK(rocsparse_cdotci(handle, nnz, dx_val, dx_ind, dy, &dot, idx_base));

    // Print result
    std::cout << "Dot product: " << dot << std::endl;

    // Clear rocSPARSE
    ROCSPARSE_CHECK(rocsparse_destroy_handle(handle));

    // Clear device memory
    HIP_CHECK(hipFree(dx_ind));
    HIP_CHECK(hipFree(dx_val));
    HIP_CHECK(hipFree(dy));

    return 0;
}