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lammps/lib/cuda/fft3d_cuda_kernel.cu
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fft3d_cuda_kernel.cu
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
Original Version:
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
See the README file in the top-level LAMMPS directory.
-----------------------------------------------------------------------
USER-CUDA Package and associated modifications:
https://sourceforge.net/projects/lammpscuda/
Christian Trott, christian.trott@tu-ilmenau.de
Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
Theoretical Physics II, University of Technology Ilmenau, Germany
See the README file in the USER-CUDA directory.
This software is distributed under the GNU General Public License.
------------------------------------------------------------------------- */
__global__ void initfftdata_kernel(double* in, FFT_FLOAT* out)
{
out[2 * (((blockIdx.x * gridDim.y + blockIdx.y)*blockDim.x) + threadIdx.x)] = in[((blockIdx.x * gridDim.y + blockIdx.y) * blockDim.x) + threadIdx.x];
out[2 * (((blockIdx.x * gridDim.y + blockIdx.y)*blockDim.x) + threadIdx.x) + 1] = 0;
}
__global__ void permute_kernel(FFT_FLOAT* in, FFT_FLOAT* out)
{
out[2 * (((threadIdx.x / 2)*gridDim.x + blockIdx.x)*gridDim.y + blockIdx.y) + threadIdx.x - 2 * (threadIdx.x / 2)] = in[((blockIdx.x * gridDim.y + blockIdx.y) * blockDim.x) + threadIdx.x];
}
__global__ void permute_scale_kernel(FFT_FLOAT* in, FFT_FLOAT* out)
{
out[2 * (((threadIdx.x / 2)*gridDim.x + blockIdx.x)*gridDim.y + blockIdx.y) + threadIdx.x - 2 * (threadIdx.x / 2)] = in[((blockIdx.x * gridDim.y + blockIdx.y) * blockDim.x) + threadIdx.x] * gridDim.x * gridDim.y * blockDim.x * 0.5;
}
__global__ void permute_part_kernel(FFT_FLOAT* in, FFT_FLOAT* out, int nfast, int nmid, int nslow, int ihi, int ilo, int jhi, int jlo, int khi, int klo)
{
{
out[2 * ((threadIdx.x / 2) * (ihi - ilo + 1) * (jhi - jlo + 1) + (blockIdx.x) * (jhi - jlo + 1) + blockIdx.y - jlo) + threadIdx.x - 2 * (threadIdx.x / 2)] = in[2 * (blockIdx.x + ilo) * nmid * nslow + 2 * (blockIdx.y + jlo) * nmid + threadIdx.x + 2 * klo];
}
}
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