reuse is_switch_Cond function

[libfirm] / ir / opt / dead_code_elimination.c

diff --git a/ir/opt/dead_code_elimination.c b/ir/opt/dead_code_elimination.c
index b9876ee..50fdf20 100644 (file)
--- a/ir/opt/dead_code_elimination.c
+++ b/ir/opt/dead_code_elimination.c
@@ -185,122 +185,3 @@ ir_graph_pass_t *dead_node_elimination_pass(const char *name)
 {
        return def_graph_pass(name ? name : "dce", dead_node_elimination);
 }
-
-
-/*
-   __                      _  __ __
-  (_     __    o     _    | \/  |_
-  __)|_| | \_/ | \_/(/_   |_/\__|__
-
-  The following stuff implements a facility that automatically patches
-  registered ir_node pointers to the new node when a dead node elimination
-  occurs.
-
-  Warning: This is considered a hack - try hard to avoid this!
-*/
-
-struct survive_dce_t {
-       struct obstack obst;
-       pmap *places;
-       pmap *new_places;
-       hook_entry_t dead_node_elim;
-       hook_entry_t dead_node_elim_subst;
-};
-
-typedef struct survive_dce_list_t {
-       struct survive_dce_list_t *next;
-       ir_node **place;
-} survive_dce_list_t;
-
-static void dead_node_hook(void *context, ir_graph *irg, int start)
-{
-       survive_dce_t *sd = (survive_dce_t*)context;
-       (void) irg;
-
-       /* Create a new map before the dead node elimination is performed. */
-       if (start) {
-               sd->new_places = pmap_create_ex(pmap_count(sd->places));
-       } else {
-               /* Patch back all nodes if dead node elimination is over and something is to be done. */
-               pmap_destroy(sd->places);
-               sd->places     = sd->new_places;
-               sd->new_places = NULL;
-       }
-}
-
-/**
- * Hook called when dead node elimination replaces old by nw.
- */
-static void dead_node_subst_hook(void *context, ir_graph *irg, ir_node *old, ir_node *nw)
-{
-       survive_dce_t      *sd   = (survive_dce_t*)context;
-       survive_dce_list_t *list = (survive_dce_list_t*)pmap_get(sd->places, old);
-       (void) irg;
-
-       /* If the node is to be patched back, write the new address to all registered locations. */
-       if (list) {
-               survive_dce_list_t *p;
-
-               for (p = list; p; p = p->next)
-                       *(p->place) = nw;
-
-               pmap_insert(sd->new_places, nw, list);
-       }
-}
-
-/**
- * Make a new Survive DCE environment.
- */
-survive_dce_t *new_survive_dce(void)
-{
-       survive_dce_t *res = XMALLOC(survive_dce_t);
-       obstack_init(&res->obst);
-       res->places     = pmap_create();
-       res->new_places = NULL;
-
-       res->dead_node_elim.hook._hook_dead_node_elim = dead_node_hook;
-       res->dead_node_elim.context                   = res;
-       res->dead_node_elim.next                      = NULL;
-
-       res->dead_node_elim_subst.hook._hook_dead_node_elim_subst = dead_node_subst_hook;
-       res->dead_node_elim_subst.context = res;
-       res->dead_node_elim_subst.next    = NULL;
-
-       register_hook(hook_dead_node_elim, &res->dead_node_elim);
-       register_hook(hook_dead_node_elim_subst, &res->dead_node_elim_subst);
-       return res;
-}
-
-/**
- * Free a Survive DCE environment.
- */
-void free_survive_dce(survive_dce_t *sd)
-{
-       obstack_free(&sd->obst, NULL);
-       pmap_destroy(sd->places);
-       unregister_hook(hook_dead_node_elim, &sd->dead_node_elim);
-       unregister_hook(hook_dead_node_elim_subst, &sd->dead_node_elim_subst);
-       xfree(sd);
-}
-
-/**
- * Register a node pointer to be patched upon DCE.
- * When DCE occurs, the node pointer specified by @p place will be
- * patched to the new address of the node it is pointing to.
- *
- * @param sd    The Survive DCE environment.
- * @param place The address of the node pointer.
- */
-void survive_dce_register_irn(survive_dce_t *sd, ir_node **place)
-{
-       if (*place != NULL) {
-               ir_node *irn      = *place;
-               survive_dce_list_t *curr = (survive_dce_list_t*)pmap_get(sd->places, irn);
-               survive_dce_list_t *nw   = OALLOC(&sd->obst, survive_dce_list_t);
-
-               nw->next  = curr;
-               nw->place = place;
-
-               pmap_insert(sd->places, irn, nw);
-       }
-}