PGI's Fortran compiler, bought by NVidia a few years ago, has excellent GPU extensions. You set an attribute on an array, move stuff on there, do your computati

PGI's Fortran compiler, bought by NVidia a few years ago, has excellent GPU extensions. You set an attribute on an array, move stuff on there, do your computation, move stuff back. It was the easiest GPU coding experience I've had.