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

/*! \file */
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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
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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
    double hx_val[3] = {1.0, 2.0, 3.0};

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

    // c and s
    double c = 3.7;
    double s = 1.3;

    // Index base
    rocsparse_index_base idx_base = rocsparse_index_base_zero;

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

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

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

    // Call droti
    ROCSPARSE_CHECK(rocsparse_droti(handle, nnz, dx_val, dx_ind, dy, &c, &s, idx_base));

    // Print result
    HIP_CHECK(hipMemcpy(hx_val, dx_val, sizeof(double) * nnz, hipMemcpyDeviceToHost));
    HIP_CHECK(hipMemcpy(hy, dy, sizeof(double) * 9, hipMemcpyDeviceToHost));

    for(int i = 0; i < nnz; ++i)
    {
        std::cout << "x[" << hx_ind[i] << "] = " << hx_val[i] << std::endl;
    }

    std::cout << "y:";

    for(int i = 0; i < 9; ++i)
    {
        std::cout << " " << hy[i];
    }

    std::cout << 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;
}