+ /* Assign colors obtained from the matching. */
+ for(i = 0; i < n_alloc; ++i) {
+ const arch_register_t *reg;
+ ir_node *nodes[2];
+ int j;
+
+ assert(assignment[i] >= 0 && "there must have been a register assigned");
+ reg = arch_register_for_index(env->cls, assignment[i]);
+
+ nodes[0] = alloc_nodes[i];
+ nodes[1] = pmap_get(partners, alloc_nodes[i]);
+
+ for(j = 0; j < 2; ++j) {
+ if(!nodes[j])
+ continue;
+
+ arch_set_irn_register(aenv, nodes[j], reg);
+ (void) pset_hinsert_ptr(alloc_env->pre_colored, nodes[j]);
+ DBG((dbg, LEVEL_2, "\tsetting %+F to register %s\n", nodes[j], reg->name));
+ }
+ }
+
+ /* Allocate the non-constrained Projs of the Perm. */
+ if(perm != NULL) {
+ bitset_clear_all(bs);
+
+ /* Put the colors of all Projs in a bitset. */
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ const arch_register_t *reg = arch_get_irn_register(aenv, proj);
+
+ if(reg != NULL)
+ bitset_set(bs, reg->index);
+ }
+
+ /* Assign the not yet assigned Projs of the Perm a suitable color. */
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ const arch_register_t *reg = arch_get_irn_register(aenv, proj);
+
+ DBG((dbg, LEVEL_2, "\tchecking reg of %+F: %s\n", proj, reg ? reg->name : "<none>"));
+
+ if(reg == NULL) {
+ col = get_next_free_reg(alloc_env, bs);
+ reg = arch_register_for_index(env->cls, col);
+ bitset_set(bs, reg->index);
+ arch_set_irn_register(aenv, proj, reg);
+ pset_insert_ptr(alloc_env->pre_colored, proj);
+ DBG((dbg, LEVEL_2, "\tsetting %+F to register %s\n", proj, reg->name));
+ }
+ }
+ }
+
+ //bipartite_free(bp);
+ hungarian_free(bp);
+ pmap_destroy(partners);
+
+end:
+ obstack_free(env->obst, base);
+ return res;
+}
+
+/**
+ * Handle constraint nodes in each basic block.
+ * handle_constraints() inserts Perm nodes which perm
+ * over all values live at the constrained node right in front
+ * of the constrained node. These Perms signal a constrained node.
+ * For further comments, refer to handle_constraints().
+ */
+static void constraints(ir_node *bl, void *data)
+{
+ be_chordal_alloc_env_t *env = data;
+
+ /*
+ Start silent in the start block.
+ The silence remains until the first barrier is seen.
+ Each other block is begun loud.
+ */
+ int silent = bl == get_irg_start_block(get_irn_irg(bl));
+ ir_node *irn;
+
+ /*
+ If the block is the start block search the barrier and
+ start handling constraints from there.
+ */
+
+ for(irn = sched_first(bl); !sched_is_end(irn);) {
+ irn = handle_constraints(env, irn, &silent);
+ }