*/
-
+/**
+ * The dominance frontier for a graph.
+ */
struct _be_dom_front_info_t {
- pmap *df_map;
+ pmap *df_map; /**< A map, mapping every block to a list of its dominance frontier blocks. */
+ struct obstack obst; /**< An obstack holding all the frontier data. */
};
/**
*/
static INLINE ir_node *get_idom(ir_node *bl)
{
- ir_node *idom = get_Block_idom(bl);
- return idom == NULL ? bl : idom;
+ ir_node *idom = get_Block_idom(bl);
+ return idom == NULL ? bl : idom;
}
-static void compute_df(ir_node *n, pmap *df_map)
+/**
+ * Compute the dominance frontier for a given block.
+ *
+ * @param blk the block where the calculation starts
+ *
+ * @return the list of all blocks in the dominance frontier of blk
+ */
+static ir_node **compute_df(ir_node *blk, be_dom_front_info_t *info)
{
- ir_node *c;
- const ir_edge_t *edge;
- pset *df = pset_new_ptr_default();
-
- /* Add local dominance frontiers */
- foreach_block_succ(n, edge) {
- ir_node *y = edge->src;
-
- if(get_idom(y) != n)
- pset_insert_ptr(df, y);
- }
-
- /*
- * Go recursively down the dominance tree and add all blocks
- * int the dominance frontiers of the children, which are not
- * dominated by the given block.
- */
- for(c = get_Block_dominated_first(n); c; c = get_Block_dominated_next(c)) {
- pset *df_c;
- ir_node *w;
-
- compute_df(c, df_map);
- df_c = pmap_get(df_map, c);
-
- for(w = pset_first(df_c); w; w = pset_next(df_c)) {
- if(get_idom(w) != n)
- pset_insert_ptr(df, w);
- }
- }
-
- pmap_insert(df_map, n, df);
+ ir_node *c;
+ const ir_edge_t *edge;
+ ir_node **df_list = NEW_ARR_F(ir_node *, 0);
+ ir_node **df;
+ int len;
+
+ /* Add local dominance frontiers */
+ foreach_block_succ(blk, edge) {
+ ir_node *y = edge->src;
+
+ if (get_idom(y) != blk) {
+ ARR_APP1(ir_node *, df_list, y);
+ }
+ }
+
+ /*
+ * Go recursively down the dominance tree and add all blocks
+ * into the dominance frontiers of the children, which are not
+ * dominated by the given block.
+ */
+ for (c = get_Block_dominated_first(blk); c; c = get_Block_dominated_next(c)) {
+ int i;
+ ir_node **df_c_list = compute_df(c, info);
+
+ for (i = ARR_LEN(df_c_list) - 1; i >= 0; --i) {
+ ir_node *w = df_c_list[i];
+ if (get_idom(w) != blk)
+ ARR_APP1(ir_node *, df_list, w);
+ }
+ }
+
+ /* now copy the flexible array to the obstack */
+ len = ARR_LEN(df_list);
+ df = NEW_ARR_D(ir_node *, &info->obst, len);
+ memcpy(df, df_list, len * sizeof(df[0]));
+ DEL_ARR_F(df_list);
+ pmap_insert(info->df_map, blk, df);
+ return df;
}
be_dom_front_info_t *be_compute_dominance_frontiers(ir_graph *irg)
{
- be_dom_front_info_t *info = xmalloc(sizeof(*info));
+ be_dom_front_info_t *info = xmalloc(sizeof(*info));
- edges_assure(irg);
- info->df_map = pmap_create();
- compute_doms(irg);
- compute_df(get_irg_start_block(irg), info->df_map);
+ edges_assure(irg);
+ obstack_init(&info->obst);
+ info->df_map = pmap_create();
+ assure_doms(irg);
+ (void)compute_df(get_irg_start_block(irg), info);
- return info;
+ return info;
}
void be_free_dominance_frontiers(be_dom_front_info_t *info)
{
- pmap_entry *ent;
-
- for(ent = pmap_first(info->df_map); ent; ent = pmap_next(info->df_map))
- del_pset(ent->value);
-
- pmap_destroy(info->df_map);
- free(info);
+ obstack_free(&info->obst, NULL);
+ pmap_destroy(info->df_map);
+ free(info);
}
-pset *be_get_dominance_frontier(be_dom_front_info_t *info, ir_node *block)
+/* Get the dominance frontier of a block. */
+ir_node **be_get_dominance_frontier(be_dom_front_info_t *info, ir_node *block)
{
- return pmap_get(info->df_map, block);
+ return pmap_get(info->df_map, block);
}
static void determine_phi_blocks(pset *copies, pset *copy_blocks, pset *phi_blocks, be_dom_front_info_t *df_info)
{
ir_node *bl;
- pdeq *worklist = new_pdeq();
+ waitq *worklist = new_waitq();
FIRM_DBG_REGISTER(firm_dbg_module_t *dbg, DBG_MODULE);
/*
* Fill the worklist queue and the rest of the orig blocks array.
*/
- for(bl = pset_first(copy_blocks); bl; bl = pset_next(copy_blocks)) {
- pdeq_putr(worklist, bl);
+ for (bl = pset_first(copy_blocks); bl; bl = pset_next(copy_blocks)) {
+ waitq_put(worklist, bl);
}
while (!pdeq_empty(worklist)) {
- ir_node *bl = pdeq_getl(worklist);
- pset *df = be_get_dominance_frontier(df_info, bl);
+ ir_node *bl = waitq_get(worklist);
+ ir_node **df = be_get_dominance_frontier(df_info, bl);
+ int i;
ir_node *y;
DBG((dbg, LEVEL_3, "dom front of %+F\n", bl));
DEBUG_ONLY(
- for (y = pset_first(df); y; y = pset_next(df))
- DBG((dbg, LEVEL_3, "\t%+F\n", y))
+ for (i = ARR_LEN(df) - 1; i >= 0; --i)
+ DBG((dbg, LEVEL_3, "\t%+F\n", df[i]))
);
- for(y = pset_first(df); y; y = pset_next(df)) {
- if(!pset_find_ptr(phi_blocks, y)) {
+ for (i = ARR_LEN(df) - 1; i >= 0; --i) {
+ y = df[i];
+ if (!pset_find_ptr(phi_blocks, y)) {
pset_insert_ptr(phi_blocks, y);
/*
set_irn_link(y, NULL);
if(!pset_find_ptr(copy_blocks, y))
- pdeq_putr(worklist, y);
+ waitq_put(worklist, y);
}
}
}
- del_pdeq(worklist);
+ del_waitq(worklist);
}
/*
free(nodes);
curr = perm;
- for(i = 0; i < n; ++i) {
+ for (i = 0; i < n; ++i) {
ir_node *copies[2];
ir_node *perm_op = get_irn_n(perm, i);
const arch_register_t *reg = arch_get_irn_register(arch_env, perm_op);
obstack_free(&c.obst, NULL);
}
+/**
+ * Post-block-walker: Find blocks containing only one jump and
+ * remove them.
+ */
static void remove_empty_block(ir_node *block, void *data) {
- ir_graph *irg;
const ir_edge_t *edge, *next;
ir_node *node;
+ int *changed = data;
ir_node *jump = NULL;
assert(is_Block(block));
set_Block_cfgpred(block, 0, new_Bad());
sched_remove(jump);
-
- irg = get_irn_irg(block);
- set_irg_doms_inconsistent(irg);
- set_irg_extblk_inconsistent(irg);
- set_irg_outs_inconsistent(irg);
+ *changed = 1;
}
-/**
- * removes basic blocks that just contain a jump instruction
- */
-void be_remove_empty_blocks(ir_graph *irg) {
- irg_block_walk_graph(irg, remove_empty_block, NULL, NULL);
+/* removes basic blocks that just contain a jump instruction */
+int be_remove_empty_blocks(ir_graph *irg) {
+ int changed = 0;
+
+ irg_block_walk_graph(irg, remove_empty_block, NULL, &changed);
+ if (changed) {
+ /* invalidate analysis info */
+ set_irg_doms_inconsistent(irg);
+ set_irg_extblk_inconsistent(irg);
+ set_irg_outs_inconsistent(irg);
+ }
+ return changed;
}
projects / libfirm / blobdiff