* Copyright: (c) Universitaet Karlsruhe
* Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
*
+ *
* ILP formalization using G=(V, E, Q):
- * - 1 class of variables: equal color vars
+ * - 2 class of variables: coloring vars x_ic and equal color vars y_ij
* - Path constraints
- * - Clique path constraints
+ * - Clique-star constraints
*
*
* \min \sum_{ (i,j) \in Q } w_ij y_ij
*
- * y_ij = 1 (i,j) \in E
+ * \sum_c x_nc = 1 n \in N, c \in C
*
- * \sum_c y_nc = |C| - 1 n \in N, c \in C
+ * x_nc = 0 n \in N, c \not\in C(n)
*
- * y_nc = 1 n \in N, c \not\in C(n)
+ * \sum x_nc <= 1 x_nc \in Clique \in AllCliques, c \in C
*
* \sum_{e \in p} y_e >= 1 p \in P path constraints
*
- * \sum_{e \in cp} y_e >= |cp| - 1 cp \in CP clique-path constraints
+ * \sum_{e \in cs} y_e >= |cs| - 1 cs \in CP clique-star constraints
*
- * y_ij \in N, w_ij \in R^+
+ * x_nc, y_ij \in N, w_ij \in R^+
*/
#ifdef HAVE_CONFIG_H
#ifdef WITH_ILP
+#include "irtools.h"
+#include "irgwalk.h"
#include "becopyilp_t.h"
#include "beifg_t.h"
-#include "irtools.h"
+#include "besched_t.h"
#define DEBUG_LVL 1
}
}
-static void build_path_cstr(ilp_env_t *ienv) {
+/**
+ * Helping stuff for build_clique_star_cstr
+ */
+typedef struct _edge_t {
+ ir_node *n1, *n2;
+} edge_t;
+
+static int compare_edge_t(const void *k1, const void *k2, size_t size) {
+ const edge_t *e1 = k1;
+ const edge_t *e2 = k2;
+
+ return ! (e1->n1 == e2->n1 && e1->n2 == e2->n2);
+}
+
+#define HASH_EDGE(e) (HASH_PTR((e)->n1) ^ HASH_PTR((e)->n2))
+
+static INLINE edge_t *add_edge(set *edges, ir_node *n1, ir_node *n2, int *counter) {
+ edge_t new_edge;
+ if (PTR_TO_INT(n1) < PTR_TO_INT(n2)) {
+ new_edge.n1 = n1;
+ new_edge.n2 = n2;
+ } else {
+ new_edge.n1 = n2;
+ new_edge.n2 = n1;
+ }
+ *counter++;
+ return set_insert(edges, &new_edge, sizeof(new_edge), HASH_EDGE(&new_edge));
+}
+
+static INLINE edge_t *find_edge(set *edges, ir_node *n1, ir_node *n2) {
+ edge_t new_edge;
+
+ if (PTR_TO_INT(n1) < PTR_TO_INT(n2)) {
+ new_edge.n1 = n1;
+ new_edge.n2 = n2;
+ } else {
+ new_edge.n1 = n2;
+ new_edge.n2 = n1;
+ }
+ return set_find(edges, &new_edge, sizeof(new_edge), HASH_EDGE(&new_edge));
+}
+
+static INLINE void remove_edge(set *edges, ir_node *n1, ir_node *n2, int *counter) {
+ edge_t new_edge, *e;
+
+ if (PTR_TO_INT(n1) < PTR_TO_INT(n2)) {
+ new_edge.n1 = n1;
+ new_edge.n2 = n2;
+ } else {
+ new_edge.n1 = n2;
+ new_edge.n2 = n1;
+ }
+ e = set_find(edges, &new_edge, sizeof(new_edge), HASH_EDGE(&new_edge));
+ if (e) {
+ e->n1 = NULL;
+ e->n2 = NULL;
+ *counter--;
+ }
}
-static void build_clique_path_cstr(ilp_env_t *ienv) {
+#define pset_foreach(pset, irn) for(irn=pset_first(pset); irn; irn=pset_next(pset))
+
+/**
+ * Search for an interference clique and an external node
+ * with affinity edges to all nodes of the clique.
+ * At most 1 node of the clique can be colored equally with the external node.
+ */
+static void build_clique_star_cstr(ilp_env_t *ienv) {
+ node_t *node;
+
+ /* for each node with affinity edges */
+ co_gs_foreach_node(ienv->co, node) {
+ struct obstack ob;
+ neighb_t *nbr;
+ ir_node *center = node->irn;
+ ir_node **nodes;
+ set *edges;
+ int i, o, n_nodes, n_edges;
+
+ obstack_init(&ob);
+ edges = new_set(compare_edge_t, 8);
+
+ /* get all affinity neighbours */
+ n_nodes = 0;
+ co_gs_foreach_neighb(node, nbr) {
+ obstack_ptr_grow(&ob, nbr->irn);
+ ++n_nodes;
+ }
+ nodes = obstack_finish(&ob);
+
+ /* get all interference edges between these */
+ n_edges = 0;
+ for (i=0; i<n_nodes; ++i)
+ for (o=0; o<i; ++o)
+ if (be_ifg_connected(ienv->co->cenv->ifg, nodes[i], nodes[o]))
+ add_edge(edges, nodes[i], nodes[o], &n_edges);
+
+ /* cover all these interference edges with maximal cliques */
+ while (n_edges) {
+ edge_t *e;
+ pset *clique = pset_new_ptr(8);
+ int growed;
+
+ /* get 2 starting nodes to form a clique */
+ for (e=set_first(edges); !e->n1; e=set_next(edges))
+ /*nothing*/ ;
+
+ remove_edge(edges, e->n1, e->n2, &n_edges);
+ pset_insert_ptr(clique, e->n1);
+ pset_insert_ptr(clique, e->n2);
+
+ /* while the clique is growing */
+ do {
+ growed = 0;
+
+ /* search for a candidate to extend the clique */
+ for (i=0; i<n_nodes; ++i) {
+ ir_node *member, *cand = nodes[i];
+ int is_cand;
+
+ /* if its already in the clique try the next */
+ if (pset_find_ptr(clique, cand))
+ continue;
+
+ /* are there all necessary interferences? */
+ is_cand = 1;
+ pset_foreach(clique, member) {
+ if (!find_edge(edges, cand, member)) {
+ is_cand = 0;
+ pset_break(clique);
+ break;
+ }
+ }
+
+ /* now we know if we have a clique extender */
+ if (is_cand) {
+ /* first remove all covered edges */
+ pset_foreach(clique, member)
+ remove_edge(edges, cand, member, &n_edges);
+
+ /* insert into clique */
+ pset_insert_ptr(clique, cand);
+ growed = 1;
+ break;
+ }
+ }
+ } while (growed);
+
+ /* now the clique is maximal. Finally add the constraint */
+ {
+ ir_node *member;
+ int var_idx, cst_idx, center_nr, member_nr;
+ char buf[16];
+
+ cst_idx = lpp_add_cst(ienv->lp, NULL, lpp_greater, pset_count(clique)-1);
+ center_nr = get_irn_node_nr(center);
+
+ pset_foreach(clique, member) {
+ member_nr = get_irn_node_nr(member);
+ var_idx = lpp_get_var_idx(ienv->lp, name_cdd_sorted(buf, 'y', center_nr, member_nr));
+ lpp_set_factor_fast(ienv->lp, cst_idx, var_idx, 1.0);
+ }
+ }
+
+ del_pset(clique);
+ }
+
+ del_set(edges);
+ obstack_free(&ob, NULL);
+ }
+}
+
+/**
+ *
+ */
+static void build_path_cstr(ilp_env_t *ienv) {
}
build_coloring_cstr(ienv);
build_interference_cstr(ienv);
build_affinity_cstr(ienv);
+ build_clique_star_cstr(ienv);
build_path_cstr(ienv);
- build_clique_path_cstr(ienv);
lower_bound = co_get_lower_bound(ienv->co) - co_get_inevit_copy_costs(ienv->co);
lpp_set_bound(ienv->lp, lower_bound);
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