quasirandomGenerator_gpu.cuh

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#ifndef QUASIRANDOMGENERATOR_GPU_CUH
#define QUASIRANDOMGENERATOR_GPU_CUH

#include <nvrtc_helper.h>
#include "quasirandomGenerator_common.h"

// Fast integer multiplication
#define MUL(a, b) __umul24(a, b)

// Global variables for nvrtc outputs
char *cubin;
size_t cubinSize;
CUmodule module;

////////////////////////////////////////////////////////////////////////////////
// GPU code
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
// Niederreiter quasirandom number generation kernel
////////////////////////////////////////////////////////////////////////////////

// Table initialization routine
void initTableGPU(unsigned int tableCPU[QRNG_DIMENSIONS][QRNG_RESOLUTION]) {
  CUdeviceptr c_Table;
  checkCudaErrors(cuModuleGetGlobal(&c_Table, NULL, module, "c_Table"));
  checkCudaErrors(
      cuMemcpyHtoD(c_Table, tableCPU,
                   QRNG_DIMENSIONS * QRNG_RESOLUTION * sizeof(unsigned int)));
}

// Host-side interface
void quasirandomGeneratorGPU(CUdeviceptr d_Output, unsigned int seed,
                             unsigned int N) {
  dim3 threads(128, QRNG_DIMENSIONS);
  dim3 cudaGridSize(128, 1, 1);

  CUfunction kernel_addr;
  checkCudaErrors(
      cuModuleGetFunction(&kernel_addr, module, "quasirandomGeneratorKernel"));

  void *args[] = {(void *)&d_Output, (void *)&seed, (void *)&N};
  checkCudaErrors(cuLaunchKernel(kernel_addr, cudaGridSize.x, cudaGridSize.y,
                                 cudaGridSize.z, /* grid dim */
                                 threads.x, threads.y,
                                 threads.z, /* block dim */
                                 0, 0,      /* shared mem, stream */
                                 &args[0],  /* arguments */
                                 0));

  checkCudaErrors(cuCtxSynchronize());
}

void inverseCNDgpu(CUdeviceptr d_Output, unsigned int N) {
  dim3 threads(128, 1, 1);
  dim3 cudaGridSize(128, 1, 1);

  CUfunction kernel_addr;
  checkCudaErrors(
      cuModuleGetFunction(&kernel_addr, module, "inverseCNDKernel"));

  void *args[] = {(void *)&d_Output, (void *)&N};
  checkCudaErrors(cuLaunchKernel(kernel_addr, cudaGridSize.x, cudaGridSize.y,
                                 cudaGridSize.z, /* grid dim */
                                 threads.x, threads.y,
                                 threads.z, /* block dim */
                                 0, 0,      /* shared mem, stream */
                                 &args[0],  /* arguments */
                                 0));

  checkCudaErrors(cuCtxSynchronize());
}

#endif