* @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.
DEBUG_ONLY(static firm_dbg_module_t *dbg;)
/**
- * Return the effective use block of a node and it's predecessor on
+ * Return the effective use block of a node and its predecessor on
* position pos.
*
* @param node the node
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_type *tp = get_irn_type(irn);
- tarval *tv = new_tarval_from_long(nr, mode);
- c = new_r_Const_type(current_ir_graph, tv, tp);
- }
+ 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.
* We can replace the input with true/false.
*/
if (con == NULL) {
- con = new_Const(pnc == pn_Cond_true ? tarval_b_true : tarval_b_false);
+ ir_graph *irg = get_irn_irg(block);
+ con = new_r_Const(irg, pnc == pn_Cond_true ? tarval_b_true : tarval_b_false);
}
old = get_irn_n(user, pos);
set_irn_n(user, pos, con);
}
assert(other_blk);
- /*
+ /*
* Note the special case here: if block is a then, there might be no else
* block. In that case the other_block is the user_blk itself and pred_block
* is the cond_block ...
NEW_ARR_A(ir_node *, in, n);
/* ok, ALL predecessors are either dominated by block OR other block */
if (c_b == NULL) {
- ir_node *c_true = new_Const(tarval_b_true);
- ir_node *c_false = new_Const(tarval_b_false);
+ ir_graph *irg = get_irn_irg(block);
+ ir_node *c_true = new_r_Const(irg, tarval_b_true);
+ ir_node *c_false = new_r_Const(irg, tarval_b_false);
env->num_consts += 2;
if (pnc == pn_Cond_true) {
c_b = c_true;
*
* @param block the block which is entered by the branch
* @param cmp the Cmp node expressing the branch condition
- * @param pnc the Compare relation for taking this branch
+ * @param rel the Compare relation for taking this branch
* @param env statistical environment
*/
-static void handle_if(ir_node *block, ir_node *cmp, pn_Cmp pnc, env_t *env)
+static void handle_if(ir_node *block, ir_node *cmp, ir_relation rel, env_t *env)
{
ir_node *left = get_Cmp_left(cmp);
ir_node *right = get_Cmp_right(cmp);
left = right;
right = t;
- pnc = get_inversed_pnc(pnc);
+ rel = get_inversed_relation(rel);
}
/*
* First case: both values are identical.
* replace the left one by the right (potentially const) one.
*/
- if (pnc == pn_Cmp_Eq) {
+ if (rel == ir_relation_equal) {
cond_block = get_Block_cfgpred_block(block, 0);
for (edge = get_irn_out_edge_first(left); edge; edge = next) {
ir_node *user = get_edge_src_irn(edge);
* 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)) {
+ const ir_edge_t *user_edge;
+ const ir_edge_t *user_next;
+ foreach_out_edge_safe(user, user_edge, user_next) {
+ 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
- * replacing it's pos'th input.
+ * replacing its pos'th input.
*
* This is always good for unop's and might be good
* for binops.
}
}
}
- } else { /* not pn_Cmp_Eq cases */
+ } else { /* not ir_relation_equal cases */
ir_node *c = NULL;
foreach_out_edge_safe(left, edge, next) {
* We can replace the input with a Confirm(left, pnc, right).
*/
if (! c)
- c = new_r_Confirm(block, left, right, pnc);
+ c = new_r_Confirm(block, left, right, rel);
pos = get_edge_src_pos(edge);
set_irn_n(succ, pos, c);
/* also construct inverse Confirms */
ir_node *rc = NULL;
- pnc = get_inversed_pnc(pnc);
+ rel = get_inversed_relation(rel);
foreach_out_edge_safe(right, edge, next) {
ir_node *succ = get_edge_src_irn(edge);
int pos;
/*
* Ok, we found a usage of right in a block
* dominated by the branch block.
- * We can replace the input with a Confirm(right, pnc^-1, left).
+ * We can replace the input with a Confirm(right, rel^-1, left).
*/
if (! rc)
- rc = new_r_Confirm(block, right, left, pnc);
+ rc = new_r_Confirm(block, right, left, rel);
pos = get_edge_src_pos(edge);
set_irn_n(succ, pos, rc);
}
}
}
-} /* handle_if */
+}
/**
* Pre-block-walker: Called for every block to insert Confirm nodes
*/
-static void insert_Confirm_in_block(ir_node *block, void *env)
+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) {
- ir_node *cmp;
- pn_Cmp pnc;
-
- handle_modeb(block, selector, get_Proj_proj(proj), env);
+ 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;
- /* this should be an IF, check this */
- if (! is_Proj(selector))
- return;
+ handle_modeb(block, selector, (pn_Cond) get_Proj_proj(proj), env);
- cmp = get_Proj_pred(selector);
- if (! is_Cmp(cmp))
+ if (! is_Cmp(selector))
return;
- pnc = get_Proj_proj(selector);
+ rel = get_Cmp_relation(selector);
if (get_Proj_proj(proj) != pn_Cond_true) {
/* it's the false branch */
- mode = get_irn_mode(get_Cmp_left(cmp));
- pnc = get_negated_pnc(pnc, mode);
+ rel = get_negated_relation(rel);
}
- DB((dbg, LEVEL_2, "At %+F using %+F Confirm %=\n", block, cmp, pnc));
-
- handle_if(block, cmp, pnc, env);
- } else if (mode_is_int(mode)) {
- long proj_nr = get_Proj_proj(proj);
+ DB((dbg, LEVEL_2, "At %+F using %+F Confirm %=\n", block, selector, rel));
- /* 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);
+ handle_if(block, selector, rel, env);
}
-} /* insert_Confirm_in_block */
+}
/**
* Checks if a node is a non-null Confirm.
for (;;) {
if (! is_Confirm(ptr))
break;
- if (get_Confirm_cmp(ptr) == pn_Cmp_Lg) {
+ if (get_Confirm_relation(ptr) == ir_relation_less_greater) {
ir_node *bound = get_Confirm_bound(ptr);
if (is_Const(bound) && is_Const_null(bound))
if (is_SymConst_addr_ent(ptr))
return 1;
return 0;
-} /* is_non_null_Confirm */
+}
/**
* The given pointer will be dereferenced, add non-null Confirms.
* We can replace the input with a Confirm(ptr, !=, NULL).
*/
if (c == NULL) {
- ir_mode *mode = get_irn_mode(ptr);
- c = new_Const(get_mode_null(mode));
-
- c = new_r_Confirm(block, ptr, c, pn_Cmp_Lg);
+ ir_mode *mode = get_irn_mode(ptr);
+ ir_graph *irg = get_irn_irg(block);
+ c = new_r_Const(irg, get_mode_null(mode));
+ c = new_r_Confirm(block, ptr, c, ir_relation_less_greater);
}
set_irn_n(succ, pos, c);
env->num_confirms += 1;
}
}
-} /* insert_non_null */
+}
/**
* Pre-walker: Called for every node to insert Confirm nodes
*/
-static void insert_Confirm(ir_node *node, void *env)
+static void insert_Confirm(ir_node *node, void *data)
{
ir_node *ptr;
+ env_t *env = (env_t*) data;
switch (get_irn_opcode(node)) {
case iro_Block:
default:
break;
}
-} /* insert_Confirm */
+}
/*
* 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;
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));
+ 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);
-} /* construct_confirms */
+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);
-} /* construct_confirms_pass */
+}
-#if 0
-/**
- * Post-walker: Remove Confirm nodes
- */
-static void rem_Confirm(ir_node *n, void *env)
+static void remove_confirm(ir_node *n, void *env)
{
+ ir_node *value;
+
(void) env;
- if (is_Confirm(n)) {
- ir_node *value = get_Confirm_value(n);
- if (value != n)
- exchange(n, value);
- else {
- /*
- * Strange: a Confirm is its own bound. This can happen
- * in dead blocks when Phi nodes are already removed.
- */
- exchange(n, new_Bad());
- }
- }
-} /* rem_Confirm */
-#endif
+ if (!is_Confirm(n))
+ return;
+
+ value = get_Confirm_value(n);
+ exchange(n, value);
+}
-/*
- * Remove all Confirm nodes from a graph.
- */
void remove_confirms(ir_graph *irg)
{
- int rem = get_opt_remove_confirm();
-
- set_opt_remove_confirm(1);
- optimize_graph_df(irg);
- set_opt_remove_confirm(rem);
-} /* remove_confirms */
+ 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);
-} /* remove_confirms_pass */
+}
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