* @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"
/**
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 *selector = get_Switch_selector(switchn);
- 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) {
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;
}
}
-} /* handle_case */
+}
/**
* Handle a mode_b input of Cond nodes.
{
ir_node *cond, *old, *other_blk = NULL, *con = NULL;
ir_node *c_b = NULL, *c_o = NULL;
- const ir_edge_t *edge, *next;
- for (edge = get_irn_out_edge_first(selector); edge; edge = next) {
+ foreach_out_edge_safe(selector, edge) {
ir_node *user = get_edge_src_irn(edge);
int pos = get_edge_src_pos(edge);
ir_node *user_blk = get_effective_use_block(user, pos);
- next = get_irn_out_edge_next(selector, edge);
if (block_dominates(block, user_blk)) {
/*
* Ok, we found a usage of selector in a block
ir_node *left = get_Cmp_left(cmp);
ir_node *right = get_Cmp_right(cmp);
ir_node *cond_block;
- ir_op *op;
- const ir_edge_t *edge, *next;
/* Beware of Bads */
if (is_Bad(left) || is_Bad(right))
return;
- op = get_irn_op(left);
-
/* Do not create Confirm nodes for Cmp(Const, Const) constructs.
These are removed anyway */
- if (op == op_Const && is_Const(right))
+ if (is_Const(left) && is_Const(right))
return;
/* try to place the constant on the right side for a Confirm */
- if (op == op_Const || op == op_SymConst) {
+ if (is_Const(left) || is_SymConst(left)) {
ir_node *t = left;
left = right;
*/
if (rel == ir_relation_equal) {
cond_block = get_Block_cfgpred_block(block, 0);
- for (edge = get_irn_out_edge_first(left); edge; edge = next) {
+ foreach_out_edge_safe(left, edge) {
ir_node *user = get_edge_src_irn(edge);
int pos = get_edge_src_pos(edge);
ir_node *blk = get_effective_use_block(user, pos);
- next = get_irn_out_edge_next(left, edge);
if (block_dominates(block, blk)) {
/*
* Ok, we found a usage of left in a block
* left == Const and we found a movable user of left in a
* dominator of the Cond block
*/
- const ir_edge_t *edge, *next;
- for (edge = get_irn_out_edge_first(user); edge; edge = next) {
- ir_node *usr_of_usr = get_edge_src_irn(edge);
- int npos = get_edge_src_pos(edge);
- ir_node *blk = get_effective_use_block(usr_of_usr, npos);
-
- next = get_irn_out_edge_next(user, edge);
- if (block_dominates(block, blk)) {
+ foreach_out_edge_safe(user, user_edge) {
+ ir_node *usr_of_usr = get_edge_src_irn(user_edge);
+ int npos = get_edge_src_pos(user_edge);
+ ir_node *user_blk = get_effective_use_block(usr_of_usr, npos);
+
+ if (block_dominates(block, user_blk)) {
/*
* The user of the user is dominated by our true/false
* block. So, create a copy of user WITH the constant
} else { /* not ir_relation_equal cases */
ir_node *c = NULL;
- foreach_out_edge_safe(left, edge, next) {
+ foreach_out_edge_safe(left, edge) {
ir_node *succ = get_edge_src_irn(edge);
int pos = get_edge_src_pos(edge);
ir_node *blk = get_effective_use_block(succ, pos);
ir_node *rc = NULL;
rel = get_inversed_relation(rel);
- foreach_out_edge_safe(right, edge, next) {
+ foreach_out_edge_safe(right, edge) {
ir_node *succ = get_edge_src_irn(edge);
int pos;
ir_node *blk;
}
}
}
-} /* handle_if */
+}
/**
* Pre-block-walker: Called for every block to insert Confirm nodes
*/
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);
}
-} /* insert_Confirm_in_block */
+}
/**
* Checks if a node is a non-null Confirm.
if (is_SymConst_addr_ent(ptr))
return 1;
return 0;
-} /* is_non_null_Confirm */
+}
/**
* The given pointer will be dereferenced, add non-null Confirms.
*/
static void insert_non_null(ir_node *ptr, ir_node *block, env_t *env)
{
- const ir_edge_t *edge, *next;
- ir_node *c = NULL;
+ ir_node *c = NULL;
- foreach_out_edge_safe(ptr, edge, next) {
+ foreach_out_edge_safe(ptr, edge) {
ir_node *succ = get_edge_src_irn(edge);
int pos;
ir_node *blk;
env->num_confirms += 1;
}
}
-} /* insert_non_null */
+}
/**
* Pre-walker: Called for every node to insert Confirm nodes
default:
break;
}
-} /* insert_Confirm */
+}
-/*
- * Construct Confirm nodes
- */
void 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);
+ assure_irg_properties(irg,
+ IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES
+ | IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE
+ | IR_GRAPH_PROPERTY_NO_CRITICAL_EDGES);
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;
irg_block_walk_graph(irg, insert_Confirm_in_block, NULL, &env);
}
- if (env.num_confirms | env.num_consts | env.num_eq) {
- /* we have add nodes or changed DF edges */
- set_irg_outs_inconsistent(irg);
-
- /* the new nodes are not in the loop info */
- set_irg_loopinfo_inconsistent(irg);
- }
-
DB((dbg, LEVEL_1, "# Confirms inserted : %u\n", env.num_confirms));
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));
- /* deactivate edges if they where off */
- if (! edges_active)
- edges_deactivate(irg);
-} /* construct_confirms */
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_CONTROL_FLOW);
+}
-/* Construct a pass. */
ir_graph_pass_t *construct_confirms_pass(const char *name)
{
return def_graph_pass(name ? name : "confirm", construct_confirms);
-} /* construct_confirms_pass */
+}
static void remove_confirm(ir_node *n, void *env)
{
exchange(n, value);
}
-/*
- * Remove all Confirm nodes from a graph.
- */
void remove_confirms(ir_graph *irg)
{
irg_walk_graph(irg, NULL, remove_confirm, NULL);
-} /* remove_confirms */
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_CONTROL_FLOW);
+}
-/* Construct a pass. */
ir_graph_pass_t *remove_confirms_pass(const char *name)
{
return def_graph_pass(name ? name : "rem_confirm", remove_confirms);
-} /* remove_confirms_pass */
+}
projects / libfirm / blobdiff