4 * Copyright: (c) Universitaet Karlsruhe
5 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
7 * Main file for the optimization reducing the copies needed for:
9 * - Register-constrained nodes
10 * - Two-address code instructions
18 #include "firm_types.h"
19 #include "bechordal.h"
22 * Has to be called during the firm init phase
24 void be_copy_opt_init(void);
26 typedef int(*cost_fct_t)(ir_node*, ir_node*, int);
28 typedef struct _copy_opt_t copy_opt_t;
31 * Generate the problem. Collect all information and optimizable nodes.
33 copy_opt_t *new_copy_opt(be_chordal_env_t *chordal_env, cost_fct_t get_costs);
36 * Free the space used...
38 void free_copy_opt(copy_opt_t *co);
41 * Checks if a node is optimizable, viz. has something to do with coalescing
42 * @param arch The architecture environment
43 * @param irn The irn to check
45 int co_is_optimizable_root(const copy_opt_t *co, ir_node *irn);
48 * Checks if the irn is a non-interfering argument of a node which 'is_optimizable'
50 int co_is_optimizable_arg(const copy_opt_t *co, ir_node *irn);
53 * Computes the costs of a copy according to loop depth
54 * @param pos: the argument position of arg in the root arguments
55 * @return Must be >= 0 in all cases.
57 int co_get_costs_loop_depth(ir_node *root, ir_node* arg, int pos);
60 * All costs equal 1. Using this will reduce the _number_ of copies.
61 * @return Must be >= 0 in all cases.
63 int co_get_costs_all_one(ir_node *root, ir_node* arg, int pos);
69 * Build internal optimization units structure
71 void co_build_ou_structure(copy_opt_t *co);
74 * Frees the space used by the opt unit representation.
75 * Does NOT free the whole copyopt structure
77 void co_free_ou_structure(copy_opt_t *co);
80 * Solves the problem using a heuristic approach
81 * Uses the OU data structure
83 int co_solve_heuristic(copy_opt_t *co);
85 void co_solve_heuristic_new(copy_opt_t *co);
89 * Solves the copy minimization problem using another heuristic approach.
90 * Uses the OU and the GRAPH data structure.
92 void co_solve_heuristic_new(copy_opt_t *co);
95 * Returns the maximal costs possible, i.e. the costs if all
96 * pairs would be assigned different registers.
97 * Uses the OU data structure
99 int co_get_max_copy_costs(const copy_opt_t *co);
102 * Returns the inevitable costs, i.e. the costs of
103 * all copy pairs which interfere.
104 * Uses the OU data structure
106 int co_get_inevit_copy_costs(const copy_opt_t *co);
109 * Returns the current costs the copies are causing.
110 * The result includes inevitable costs and the costs
111 * of the copies regarding the current register allocation
112 * Uses the OU data structure
114 int co_get_copy_costs(const copy_opt_t *co);
117 * Returns a lower bound for the costs of copies in this ou.
118 * The result includes inevitable costs and the costs of a
119 * minimal costs caused by the nodes of the ou.
120 * Uses the OU data structure
122 int co_get_lower_bound(const copy_opt_t *co);
125 * Dump the interference graph according to the Appel/George coalescing contest file format.
126 * See: http://www.cs.princeton.edu/~appel/coalesce/format.html
127 * @note Requires graph structure.
128 * @param co The copy opt object.
129 * @param f A file to dump to.
131 void co_dump_appel_graph(const copy_opt_t *co, FILE *f);
136 * Constructs another internal representation of the affinity edges
138 void co_build_graph_structure(copy_opt_t *co);
141 * Frees the space used by the graph representation.
142 * Does NOT free the whole copyopt structure
144 void co_free_graph_structure(copy_opt_t *co);
147 * Solves the problem using mixed integer programming
148 * @returns 1 iff solution state was optimal
151 int co_solve_ilp1(copy_opt_t *co, double time_limit);
154 * Solves the problem using mixed integer programming
155 * @returns 1 iff solution state was optimal
156 * Uses the OU and the GRAPH data structure
157 * Dependency of the OU structure can be removed
159 int co_solve_ilp2(copy_opt_t *co, double time_limit);
162 * Checks if a node is optimizable, viz has something to do with coalescing.
163 * Uses the GRAPH data structure
165 int co_gs_is_optimizable(copy_opt_t *co, ir_node *irn);
167 #endif /* _BECOPYOPT_H */