## lustrec / src / optimize_prog.ml @ 68601cf5

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(********************************************************************) |
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(* *) |

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(* The LustreC compiler toolset / The LustreC Development Team *) |

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(* Copyright 2012 - -- ONERA - CNRS - INPT *) |

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(* *) |

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(* LustreC is free software, distributed WITHOUT ANY WARRANTY *) |

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(* under the terms of the GNU Lesser General Public License *) |

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(* version 2.1. *) |

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(* *) |

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(********************************************************************) |

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open Corelang |

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open LustreSpec |

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(* Consts unfoooolding *) |

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let is_const i consts = |

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List.exists (fun c -> c.const_id = i) consts |

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let get_const i consts = |

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let c = List.find (fun c -> c.const_id = i) consts in |

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c.const_value |

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let rec expr_unfold_consts consts e = |

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{ e with expr_desc = expr_desc_unfold_consts consts e.expr_desc e.expr_type } |

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and expr_desc_unfold_consts consts e e_type = |

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let unfold = expr_unfold_consts consts in |

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match e with |

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| Expr_const _ -> e |

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| Expr_ident i -> if is_const i consts && not (Types.is_array_type e_type) then Expr_const (get_const i consts) else e |

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| Expr_array el -> Expr_array (List.map unfold el) |

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| Expr_access (e1, d) -> Expr_access (unfold e1, d) |

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| Expr_power (e1, d) -> Expr_power (unfold e1, d) |

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| Expr_tuple el -> Expr_tuple (List.map unfold el) |

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| Expr_ite (c, t, e) -> Expr_ite (unfold c, unfold t, unfold e) |

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| Expr_arrow (e1, e2)-> Expr_arrow (unfold e1, unfold e2) |

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| Expr_fby (e1, e2) -> Expr_fby (unfold e1, unfold e2) |

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(* | Expr_concat (e1, e2) -> Expr_concat (unfold e1, unfold e2) *) |

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(* | Expr_tail e' -> Expr_tail (unfold e') *) |

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| Expr_pre e' -> Expr_pre (unfold e') |

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| Expr_when (e', i, l)-> Expr_when (unfold e', i, l) |

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| Expr_merge (i, hl) -> Expr_merge (i, List.map (fun (t, h) -> (t, unfold h)) hl) |

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| Expr_appl (i, e', i') -> Expr_appl (i, unfold e', i') |

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let eq_unfold_consts consts eq = |

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{ eq with eq_rhs = expr_unfold_consts consts eq.eq_rhs } |

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let node_unfold_consts consts node = |

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{ node with node_stmts = List.map (fun eq -> Eq (eq_unfold_consts consts eq)) (get_node_eqs node) } |

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let prog_unfold_consts prog = |

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let consts = List.map const_of_top (get_consts prog) in |

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List.map ( |

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fun decl -> match decl.top_decl_desc with |

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| Node nd -> {decl with top_decl_desc = Node (node_unfold_consts consts nd)} |

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| _ -> decl |

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) prog |

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(* Distribution of when inside sub-expressions, i.e. (a+b) when c --> a when c + b when c |

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May increase clock disjointness of variables, which is useful for code optimization |

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*) |

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let apply_stack expr stack = |

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List.fold_left (fun expr (v, t) -> mkexpr expr.expr_loc (Expr_when (expr, v, t))) expr stack |

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let expr_distribute_when expr = |

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let rec distrib stack expr = |

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match expr.expr_desc with |

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| Expr_const _ |

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| Expr_ident _ |

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| Expr_arrow _ |

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| Expr_fby _ |

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| Expr_pre _ |

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-> apply_stack expr stack |

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| Expr_appl (id, _, _) when not (Stateless.check_node (node_from_name id)) |

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-> apply_stack expr stack |

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| Expr_ite (c, t, e) |

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-> let cid = ident_of_expr c in |

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mkexpr expr.expr_loc |

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(Expr_merge (cid, |

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[(tag_true , distrib ((cid,tag_true )::stack) t); |

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(tag_false, distrib ((cid,tag_false)::stack) e)])) |

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| Expr_array el -> { expr with expr_desc = (Expr_array (List.map (distrib stack) el)) } |

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| Expr_access (e1, d) -> { expr with expr_desc = Expr_access (distrib stack e1, d) } |

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| Expr_power (e1, d) -> { expr with expr_desc = Expr_power (distrib stack e1, d) } |

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| Expr_tuple el -> { expr with expr_desc = Expr_tuple (List.map (distrib stack) el) } |

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| Expr_when (e', i, l)-> distrib ((i, l)::stack) e' |

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| Expr_merge (i, hl) -> { expr with expr_desc = Expr_merge (i, List.map (fun (t, h) -> (t, distrib stack h)) hl) } |

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| Expr_appl (id, e', i') -> { expr with expr_desc = Expr_appl (id, distrib stack e', i')} |

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in distrib [] expr |

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let eq_distribute_when eq = |

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{ eq with eq_rhs = expr_distribute_when eq.eq_rhs } |

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let node_distribute_when node = |

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{ node with node_stmts = List.map (fun eq -> Eq (eq_distribute_when eq)) (get_node_eqs node) } |

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let prog_distribute_when prog = |

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List.map ( |

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fun decl -> match decl.top_decl_desc with |

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| Node nd -> {decl with top_decl_desc = Node (node_distribute_when nd)} |

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| _ -> decl |

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) prog |

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(* Local Variables: *) |

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(* compile-command:"make -C .." *) |

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(* End: *) |