* @brief Construction of Confirm nodes
* @author Michael Beck
* @date 6.2005
- * @version $Id$
*/
#include "config.h"
#include "irtools.h"
#include "array_t.h"
#include "debug.h"
+#include "error.h"
#include "irflag.h"
+#include "opt_manage.h"
/**
* Walker environment.
return get_nodes_block(node);
}
+static ir_node *get_case_value(ir_node *switchn, long pn)
+{
+ ir_graph *irg = get_irn_irg(switchn);
+ const ir_switch_table *table = get_Switch_table(switchn);
+ size_t n_entries = ir_switch_table_get_n_entries(table);
+ ir_tarval *val = NULL;
+ size_t e;
+ for (e = 0; e < n_entries; ++e) {
+ const ir_switch_table_entry *entry
+ = ir_switch_table_get_entry_const(table, e);
+ if (entry->pn != pn)
+ continue;
+ /* multiple matching entries gets too complicated for a single
+ * Confirm */
+ if (val != NULL)
+ return NULL;
+ /* case ranges are too complicated too */
+ if (entry->min != entry->max)
+ return NULL;
+ val = entry->min;
+ }
+ assert(val != NULL);
+ return new_r_Const(irg, val);
+}
+
/**
* Handle a CASE-branch.
*
- * @param block the block which is entered by the branch
- * @param irn the node expressing the switch value
- * @param nr the branch label
- * @param env statistical environment
- *
* Branch labels are a simple case. We can replace the value
* by a Const with the branch label.
*/
-static void handle_case(ir_node *block, ir_node *irn, long nr, env_t *env)
+static void handle_case(ir_node *block, ir_node *switchn, long pn, env_t *env)
{
- const ir_edge_t *edge, *next;
- ir_node *c = NULL;
+ ir_node *c = NULL;
+ ir_node *selector = get_Switch_selector(switchn);
+ const ir_edge_t *edge;
+ const ir_edge_t *next;
- if (is_Bad(irn))
+ /* we can't do usefull things with the default label */
+ if (pn == pn_Switch_default)
return;
- for (edge = get_irn_out_edge_first(irn); edge; edge = next) {
+ foreach_out_edge_safe(selector, edge, next) {
ir_node *succ = get_edge_src_irn(edge);
int pos = get_edge_src_pos(edge);
ir_node *blk = get_effective_use_block(succ, pos);
- next = get_irn_out_edge_next(irn, edge);
-
if (block_dominates(block, blk)) {
/*
* Ok, we found a user of irn that is placed
* We can replace the input with the Constant
* branch label.
*/
-
- if (! c) {
- ir_mode *mode = get_irn_mode(irn);
- ir_tarval *tv = new_tarval_from_long(nr, mode);
- c = new_r_Const(current_ir_graph, tv);
- }
+ if (c == NULL)
+ c = get_case_value(switchn, pn);
set_irn_n(succ, pos, c);
- DBG_OPT_CONFIRM_C(irn, c);
+ DBG_OPT_CONFIRM_C(selector, c);
DB((dbg, LEVEL_2, "Replacing input %d of node %+F with %+F\n", pos, succ, c));
env->num_consts += 1;
*/
static void insert_Confirm_in_block(ir_node *block, void *data)
{
- ir_node *cond, *proj, *selector;
- ir_mode *mode;
env_t *env = (env_t*) data;
+ ir_node *cond;
+ ir_node *proj;
/*
* we can only handle blocks with only ONE control flow
return;
cond = get_Proj_pred(proj);
- if (! is_Cond(cond))
- return;
-
- selector = get_Cond_selector(cond);
- mode = get_irn_mode(selector);
-
- if (mode == mode_b) {
+ if (is_Switch(cond)) {
+ long proj_nr = get_Proj_proj(proj);
+ handle_case(block, cond, proj_nr, env);
+ } else if (is_Cond(cond)) {
+ ir_node *selector = get_Cond_selector(cond);
ir_relation rel;
handle_modeb(block, selector, (pn_Cond) get_Proj_proj(proj), env);
if (get_Proj_proj(proj) != pn_Cond_true) {
/* it's the false branch */
- mode = get_irn_mode(get_Cmp_left(selector));
rel = get_negated_relation(rel);
}
DB((dbg, LEVEL_2, "At %+F using %+F Confirm %=\n", block, selector, rel));
handle_if(block, selector, rel, env);
- } else if (mode_is_int(mode)) {
- long proj_nr = get_Proj_proj(proj);
-
- /* this is a CASE, but we cannot handle the default case */
- if (proj_nr == get_Cond_default_proj(cond))
- return;
-
- handle_case(block, get_Cond_selector(cond), proj_nr, env);
}
}
/*
* Construct Confirm nodes
*/
-void construct_confirms(ir_graph *irg)
+static ir_graph_state_t do_construct_confirms(ir_graph *irg)
{
env_t env;
- int edges_active = edges_activated(irg);
-
FIRM_DBG_REGISTER(dbg, "firm.ana.confirm");
- remove_critical_cf_edges(irg);
-
- /* we need dominance info */
- assure_doms(irg);
-
assert(get_irg_pinned(irg) == op_pin_state_pinned &&
"Nodes must be placed to insert Confirms");
- if (! edges_active) {
- /* We need edges */
- edges_activate(irg);
- }
-
env.num_confirms = 0;
env.num_consts = 0;
env.num_eq = 0;
DB((dbg, LEVEL_1, "# Const replacements: %u\n", env.num_consts));
DB((dbg, LEVEL_1, "# node equalities : %u\n", env.num_eq));
DB((dbg, LEVEL_1, "# non-null Confirms : %u\n", env.num_non_null));
+ return 0;
+}
+
+static optdesc_t opt_confirms = {
+ "confirms",
+ IR_GRAPH_STATE_CONSISTENT_OUT_EDGES
+ | IR_GRAPH_STATE_CONSISTENT_DOMINANCE
+ | IR_GRAPH_STATE_NO_CRITICAL_EDGES,
+ do_construct_confirms
+};
- /* deactivate edges if they where off */
- if (! edges_active)
- edges_deactivate(irg);
+void construct_confirms(ir_graph *irg)
+{
+ perform_irg_optimization(irg, &opt_confirms);
}
-/* Construct a pass. */
ir_graph_pass_t *construct_confirms_pass(const char *name)
{
return def_graph_pass(name ? name : "confirm", construct_confirms);
exchange(n, value);
}
-/*
- * Remove all Confirm nodes from a graph.
- */
void remove_confirms(ir_graph *irg)
{
irg_walk_graph(irg, NULL, remove_confirm, NULL);
}
-/* Construct a pass. */
ir_graph_pass_t *remove_confirms_pass(const char *name)
{
return def_graph_pass(name ? name : "rem_confirm", remove_confirms);
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