projection_kernel.h

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#ifndef __COMMON_PROJECTION_KERNEL__
#define __COMMON_PROJECTION_KERNEL__
 
template< typename T >
__global__ void project_on_vec_kernel(T * __restrict__ x,
                                      const T ** xx,
                                      T * __restrict__ y,
                                      const T ** yy,
                                      const T * __restrict__ alpha,
                                      const int p_cur,
                                      const int n) {
  
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i+= str) {
    T tmp1 = 0.0;
    T tmp2 = 0.0;
    for (int j = 0; j < p_cur; j ++) {
      tmp1 += xx[j][i] * alpha[j];
      tmp2 += yy[j][i] * -alpha[j];
    }
    x[i] += tmp1;
    y[i] += tmp2;
  }
  
}
 
 
template< typename T >
__global__ void project_ortho_vec_kernel(T * __restrict__ x,
                                         const T ** xx,
                                         T * __restrict__ y,
                                         const T ** yy,
                                         const T * __restrict__ alpha,
                                         const int p_cur,
                                         const int n) {
  
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i+= str) {
    T tmp1 = 0.0;
    T tmp2 = 0.0;
    for (int j = 0; j < (p_cur - 1); j ++) {
      tmp1 += xx[j][i] * -alpha[j];
      tmp2 += yy[j][i] * -alpha[j];
    }
    x[i] += tmp1;
    y[i] += tmp2;
  }
  
}
 
#endif // __COMMON_PROJECTION_KERNEL__