a - S3L array handle describing a parallel array that contains the convolution of an unknown vector c with b. Its length must be at least ma+mb-1 (1D case) or ma+mb-1 x na+nb-1 (2D case).
b - S3L array handle describing the parallel array that contains the vector.
setup_id - Valid convolution setup ID as returned from a previous call to S3L_deconv_setup.