added some comments

[libfirm] / ir / be / bessadestr.c

diff --git a/ir/be/bessadestr.c b/ir/be/bessadestr.c
index 16efca4..39f4480 100644 (file)
--- a/ir/be/bessadestr.c
+++ b/ir/be/bessadestr.c
@@ -79,12 +79,18 @@ static int cmp_perm_proj(const void *a, const void *b, size_t n) {
        return !(p->arg == q->arg);
 }
 
+typedef struct insert_all_perms_env_t {
+       be_chordal_env_t *chordal_env;
+       pmap *perm_map;
+} insert_all_perms_env_t;
+
 /**
  * Insert Perms in all predecessors of a block containing a phi
  */
 static void insert_all_perms_walker(ir_node *bl, void *data) {
-       be_chordal_env_t *chordal_env = data;
-       pmap *perm_map = chordal_env->data;
+       insert_all_perms_env_t *env = data;
+       be_chordal_env_t *chordal_env = env->chordal_env;
+       pmap *perm_map = env->perm_map;
        ir_graph *irg = chordal_env->irg;
        be_lv_t *lv = chordal_env->birg->lv;
        int i, n;
@@ -337,17 +343,19 @@ static void       set_regs_or_place_dupls_walker(ir_node *bl, void *data) {
 void be_ssa_destruction(be_chordal_env_t *chordal_env) {
        pmap *perm_map = pmap_create();
        ir_graph *irg  = chordal_env->irg;
+       insert_all_perms_env_t insert_perms_env;
 
        FIRM_DBG_REGISTER(dbg, "ir.be.ssadestr");
 
        be_assure_liveness(chordal_env->birg);
 
        /* create a map for fast lookup of perms: block --> perm */
-       chordal_env->data = perm_map;
        irg_walk_graph(irg, clear_link, collect_phis_walker, chordal_env);
 
        DBG((dbg, LEVEL_1, "Placing perms...\n"));
-       irg_block_walk_graph(irg, insert_all_perms_walker, NULL, chordal_env);
+       insert_perms_env.chordal_env = chordal_env;
+       insert_perms_env.perm_map = perm_map;
+       irg_block_walk_graph(irg, insert_all_perms_walker, NULL, &insert_perms_env);
 
        if (chordal_env->opts->dump_flags & BE_CH_DUMP_SSADESTR)
                be_dump(irg, "-ssa_destr_perms_placed", dump_ir_block_graph_sched);