Trait libreda_pnr::place::placement_problem::PlacementProblem

source ·

pub trait PlacementProblem<C: L2NBase> {
    // Required methods
    fn fused_layout_netlist(&self) -> &C;
    fn top_cell(&self) -> C::CellId;
    fn placement_region(&self) -> Vec<SimpleRPolygon<C::Coord>>;
    fn initial_position(
        &self,
        cell_instance: &C::CellInstId
    ) -> SimpleTransform<C::Coord>;
    fn placement_status(&self, cell_instance: &C::CellInstId) -> PlacementStatus;
    fn cell_outline(&self, cell: &C::CellId) -> Option<Rect<C::Coord>>;

    // Provided methods
    fn soft_blockages(&self) -> Vec<SimpleRPolygon<C::Coord>> { ... }
    fn cell_instance_outline(
        &self,
        cell_instance: &C::CellInstId
    ) -> Option<Rect<C::Coord>> { ... }
    fn net_weight(&self, _net: &C::NetId) -> f64 { ... }
    fn get_fixed_instances(&self) -> HashSet<C::CellInstId> { ... }
    fn get_movable_instances(&self) -> HashSet<C::CellInstId> { ... }
}

Expand description

Representation of the placement task.

Required Methods§

source

fn fused_layout_netlist(&self) -> &C

Get the base layout/netlist structure.

source

fn top_cell(&self) -> C::CellId

Get the top cell whose content should be placed.

source

fn placement_region(&self) -> Vec<SimpleRPolygon<C::Coord>>

Get a list of polygons which describe where cells are allowed to be placed.

source

fn initial_position( &self, cell_instance: &C::CellInstId ) -> SimpleTransform<C::Coord>

Get the position of a cell instance which should be used as an initial value for the optimization. This is most likely the output of the previous placement step.

source

fn placement_status(&self, cell_instance: &C::CellInstId) -> PlacementStatus

Tell if the cell instance can be moved by the placement engine.

source

fn cell_outline(&self, cell: &C::CellId) -> Option<Rect<C::Coord>>

Get the abutment box / outline of the cell.

Provided Methods§

source

fn soft_blockages(&self) -> Vec<SimpleRPolygon<C::Coord>>

Get regions which should not be used for placement but can if necessary. Overlap of cells with this regions should be minimized.

source

fn cell_instance_outline( &self, cell_instance: &C::CellInstId ) -> Option<Rect<C::Coord>>

Get the abutment box / outline of the cell instance.

source

fn net_weight(&self, _net: &C::NetId) -> f64

Get the weight of a net. Default is 1.0. When optimizing the wire-length, the weighted wire-length should be used. For example a weight 0.0 means that the net should not be considered for wire-length optimization.

source