nsz Git - libfirm/blob - ir/be/becopyilp.c

   1 /**
   2  * Author:      Daniel Grund
   3  * Date:                28.02.2006
   4  * Copyright:   (c) Universitaet Karlsruhe
   5  * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
   6  *
   7  * Common stuff used by all ILP fomulations.
   8  *
   9  */
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif /* HAVE_CONFIG_H */
  14
  15 #ifdef WITH_ILP
  16
  17 #include "becopyilp_t.h"
  18 #include "beifg_t.h"
  19
  20 /******************************************************************************
  21     _____ _                        _            _   _
  22    / ____(_)                      | |          | | (_)
  23   | (___  _ _______   _ __ ___  __| |_   _  ___| |_ _  ___  _ __
  24    \___ \| |_  / _ \ | '__/ _ \/ _` | | | |/ __| __| |/ _ \| '_ \
  25    ____) | |/ /  __/ | | |  __/ (_| | |_| | (__| |_| | (_) | | | |
  26   |_____/|_/___\___| |_|  \___|\__,_|\__,_|\___|\__|_|\___/|_| |_|
  27
  28  *****************************************************************************/
  29
  30
  31 size_red_t *new_size_red(copy_opt_t *co) {
  32         size_red_t *res = malloc(sizeof(*res));
  33
  34         res->co = co;
  35         res->all_removed = pset_new_ptr_default();
  36         res->col_suff = NULL;
  37         obstack_init(&res->ob);
  38
  39         return res;
  40 }
  41
  42 /**
  43  * Checks if a node is simplicial in the graph heeding the already removed nodes.
  44  */
  45 static INLINE int sr_is_simplicial(size_red_t *sr, const ir_node *ifn) {
  46         int i, o, size = 0;
  47         ir_node **all, *curr;
  48         be_ifg_t *ifg = sr->co->cenv->ifg;
  49         void *iter = be_ifg_neighbours_iter_alloca(ifg);
  50
  51         all = alloca(be_ifg_degree(ifg, ifn) * sizeof(*all));
  52
  53         /* get all non-removed neighbors */
  54         be_ifg_foreach_neighbour(ifg, iter, ifn, curr)
  55                 if (!sr_is_removed(sr, curr))
  56                         all[size++] = curr;
  57
  58         /* check if these form a clique */
  59         for (i=0; i<size; ++i)
  60                 for (o=i+1; o<size; ++o)
  61                         if (!be_ifg_connected(ifg, all[i], all[o]))
  62                                 return 0;
  63
  64         /* all edges exist so this is a clique */
  65         return 1;
  66 }
  67
  68 void sr_remove(size_red_t *sr) {
  69         ir_node *irn;
  70         int redo = 1;
  71         int n_nodes = 0;
  72         const be_ifg_t *ifg = sr->co->cenv->ifg;
  73         void *iter = be_ifg_neighbours_iter_alloca(ifg);
  74
  75         while (redo) {
  76                 arch_register_req_t req;
  77                 redo = 0;
  78                 be_ifg_foreach_node(ifg, iter, irn) {
  79                         if (!sr_is_removed(sr, irn) && !co_is_optimizable(sr->co->aenv, irn, &req) && !co_is_optimizable_arg(sr->co, irn)) {
  80                         if (sr_is_simplicial(sr, irn)) {
  81                                         coloring_suffix_t *cs = obstack_alloc(&sr->ob, sizeof(*cs));
  82
  83                                         cs->irn = irn;
  84                                         cs->next = sr->col_suff;
  85                                         sr->col_suff = cs;
  86
  87                                         pset_insert_ptr(sr->all_removed, irn);
  88
  89                                         redo = 1;
  90                         }
  91                         }
  92                 }
  93         }
  94 }
  95
  96 void sr_reinsert(size_red_t *sr) {
  97         coloring_suffix_t *cs;
  98         be_ifg_t *ifg        = sr->co->cenv->ifg;
  99         bitset_t *used_cols  = bitset_alloca(arch_register_class_n_regs(sr->co->cls));
 100         void *iter           = be_ifg_neighbours_iter_alloca(ifg);
 101
 102         /* color the removed nodes in right order */
 103         for (cs = sr->col_suff; cs; cs = cs->next) {
 104                 int free_col;
 105                 ir_node *other, *irn;
 106
 107                 /* get free color by inspecting all neighbors */
 108                 irn = cs->irn;
 109                 bitset_clear_all(used_cols);
 110
 111                 be_ifg_foreach_neighbour(ifg, iter, irn, other) {
 112                         if (!sr_is_removed(sr, other)) /* only inspect nodes which are in graph right now */
 113                                 bitset_set(used_cols, get_irn_col(sr->co, other));
 114                 }
 115
 116                 /* now all bits not set are possible colors */
 117                 free_col = bitset_next_clear(used_cols, 0);
 118                 assert(free_col != -1 && "No free color found. This can not be.");
 119                 set_irn_col(sr->co, irn, free_col);
 120                 pset_remove_ptr(sr->all_removed, irn); /* irn is back in graph again */
 121         }
 122 }
 123
 124 void free_size_red(size_red_t *sr) {
 125         del_pset(sr->all_removed);
 126         obstack_free(&sr->ob, NULL);
 127         free(sr);
 128 }
 129
 130 /******************************************************************************
 131     _____                      _        _____ _      _____
 132    / ____|                    (_)      |_   _| |    |  __ \
 133   | |  __  ___ _ __   ___ _ __ _  ___    | | | |    | |__) |
 134   | | |_ |/ _ \ '_ \ / _ \ '__| |/ __|   | | | |    |  ___/
 135   | |__| |  __/ | | |  __/ |  | | (__   _| |_| |____| |
 136    \_____|\___|_| |_|\___|_|  |_|\___| |_____|______|_|
 137
 138  *****************************************************************************/
 139
 140 ilp_env_t *new_ilp_env(copy_opt_t *co, firm_dbg_module_t *dbg, ilp_callback build, ilp_callback apply, void *env) {
 141         ilp_env_t *res = malloc(sizeof(*res));
 142         assert(res);
 143
 144         res->co = co;
 145         res->dbg = dbg;
 146         res->build = build;
 147         res->apply = apply;
 148         res->env = env;
 149         res->sr = new_size_red(co);
 150
 151         return res;
 152 }
 153
 154 lpp_sol_state_t ilp_go(ilp_env_t *ienv, double time_limit) {
 155         sr_remove(ienv->sr);
 156
 157         ienv->build(ienv);
 158
 159         lpp_set_time_limit(ienv->lp, time_limit);
 160
 161 #ifdef LPP_SOLVE_NET
 162         lpp_solve_net(ienv->lp, LPP_HOST, LPP_SOLVER);
 163 #else
 164         lpp_solve_cplex(ienv->lp);
 165 #endif
 166
 167         ienv->apply(ienv);
 168
 169         sr_reinsert(ienv->sr);
 170
 171         return lpp_get_sol_state(ienv->lp);
 172 }
 173
 174 void free_ilp_env(ilp_env_t *ienv) {
 175         free_size_red(ienv->sr);
 176         free_lpp(ienv->lp);
 177         free(ienv);
 178 }
 179
 180 #else /* WITH_ILP */
 181
 182 static void only_that_you_can_compile_without_WITH_ILP_defined(void) {
 183 }
 184
 185 #endif /* WITH_ILP */