/*
- * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
i >= 0 && (outirn = get_irn_out(irn, i)); --i)
typedef struct walk_env_t {
+ ir_nodeset_t processed;
+ ir_mode *selector_mode;
unsigned spare_size; /**< the allowed spare size for table switches */
unsigned small_switch;
- bool allow_out_of_bounds;
bool changed; /**< indicates whether a change was performed */
- ir_nodeset_t processed;
} walk_env_t;
typedef struct case_data_t {
typedef struct switch_info_t {
ir_node *switchn;
- long switch_min;
- long switch_max;
+ ir_tarval *switch_min;
+ ir_tarval *switch_max;
ir_node *default_block;
unsigned num_cases;
case_data_t *cases;
/**
* analyze enough to decide if we should lower the switch
*/
-static bool analyse_switch0(switch_info_t *info, ir_node *switchn)
+static void analyse_switch0(switch_info_t *info, ir_node *switchn)
{
- const ir_switch_table *table = get_Switch_table(switchn);
- size_t n_entries = ir_switch_table_get_n_entries(table);
- long switch_min = LONG_MAX;
- long switch_max = LONG_MIN;
- unsigned num_cases = 0;
- size_t e;
-
- for (e = 0; e < n_entries; ++e) {
+ const ir_switch_table *table = get_Switch_table(switchn);
+ size_t n_entries = ir_switch_table_get_n_entries(table);
+ ir_mode *mode = get_irn_mode(get_Switch_selector(switchn));
+ ir_tarval *switch_min = get_mode_max(mode);
+ ir_tarval *switch_max = get_mode_min(mode);
+ unsigned num_cases = 0;
+
+ for (size_t e = 0; e < n_entries; ++e) {
const ir_switch_table_entry *entry
= ir_switch_table_get_entry_const(table, e);
- long minval;
- long maxval;
if (entry->pn == 0)
continue;
- if (!tarval_is_long(entry->min) || !tarval_is_long(entry->max))
- return false;
- minval = get_tarval_long(entry->min);
- maxval = get_tarval_long(entry->max);
- if (minval < switch_min)
- switch_min = minval;
- if (maxval > switch_max)
- switch_max = maxval;
+ if (tarval_cmp(entry->min, switch_min) == ir_relation_less)
+ switch_min = entry->min;
+ if (tarval_cmp(entry->max, switch_max) == ir_relation_greater)
+ switch_max = entry->max;
+
++num_cases;
}
info->switch_min = switch_min;
info->switch_max = switch_max;
info->num_cases = num_cases;
- return true;
}
static int casecmp(const void *a, const void *b)
info->default_block = targets[pn_Switch_default];
info->cases = cases;
+ free(targets);
}
static void normalize_table(ir_node *switchn, ir_mode *new_mode,
}
}
+static void create_out_of_bounds_check(switch_info_t *info)
+{
+ ir_node *switchn = info->switchn;
+ ir_graph *irg = get_irn_irg(switchn);
+ dbg_info *dbgi = get_irn_dbg_info(switchn);
+ ir_node *selector = get_Switch_selector(switchn);
+ ir_node *block = get_nodes_block(switchn);
+ ir_node **default_preds = NEW_ARR_F(ir_node*, 0);
+ ir_node *default_block = NULL;
+ ir_node *max_const;
+ ir_node *proj_true;
+ ir_node *proj_false;
+ ir_node *cmp;
+ ir_node *oob_cond;
+ ir_node *in[1];
+ ir_node *new_block;
+ int i;
+ ir_node *proj;
+ size_t n_default_preds;
+
+ assert(tarval_is_null(info->switch_min));
+
+ /* check for out-of-bounds */
+ max_const = new_r_Const(irg, info->switch_max);
+ cmp = new_rd_Cmp(dbgi, block, selector, max_const, ir_relation_less_equal);
+ oob_cond = new_rd_Cond(dbgi, block, cmp);
+ proj_true = new_r_Proj(oob_cond, mode_X, pn_Cond_true);
+ proj_false = new_r_Proj(oob_cond, mode_X, pn_Cond_false);
+
+ ARR_APP1(ir_node*, default_preds, proj_false);
+
+ /* create new block containing the switch */
+ in[0] = proj_true;
+ new_block = new_r_Block(irg, 1, in);
+ set_nodes_block(switchn, new_block);
+
+ /* adjust projs */
+ foreach_out_irn(switchn, i, proj) {
+ long pn = get_Proj_proj(proj);
+ if (pn == pn_Switch_default) {
+ assert(default_block == NULL);
+ default_block = get_irn_out(proj, 0);
+ ARR_APP1(ir_node*, default_preds, proj);
+ }
+ set_nodes_block(proj, new_block);
+ }
+
+ /* adapt default block */
+ n_default_preds = ARR_LEN(default_preds);
+ if (n_default_preds > 1) {
+ /* create new intermediate blocks so we don't have critical edges */
+ size_t p;
+ for (p = 0; p < n_default_preds; ++p) {
+ ir_node *pred = default_preds[p];
+ ir_node *split_block;
+ ir_node *block_in[1];
+
+ block_in[0] = pred;
+ split_block = new_r_Block(irg, 1, block_in);
+
+ default_preds[p] = new_r_Jmp(split_block);
+ }
+ }
+ set_irn_in(default_block, n_default_preds, default_preds);
+
+ DEL_ARR_F(default_preds);
+
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
+}
+
/**
* normalize switch to work on an unsigned input with the first case at 0
*/
-static void normalize_switch(switch_info_t *info)
+static void normalize_switch(switch_info_t *info, ir_mode *selector_mode)
{
- ir_node *switchn = info->switchn;
- ir_graph *irg = get_irn_irg(switchn);
- ir_node *block = get_nodes_block(switchn);
- ir_node *selector = get_Switch_selector(switchn);
- ir_mode *mode = get_irn_mode(selector);
- ir_tarval *delta = NULL;
- bool change_mode = false;
-
+ ir_node *switchn = info->switchn;
+ ir_graph *irg = get_irn_irg(switchn);
+ ir_node *block = get_nodes_block(switchn);
+ ir_node *selector = get_Switch_selector(switchn);
+ ir_mode *mode = get_irn_mode(selector);
+ ir_tarval *delta = NULL;
+ bool needs_normalize = false;
+
+ ir_tarval *min = info->switch_min;
if (mode_is_signed(mode)) {
- mode = find_unsigned_mode(mode);
- selector = new_r_Conv(block, selector, mode);
- change_mode = true;
+ mode = find_unsigned_mode(mode);
+ selector = new_r_Conv(block, selector, mode);
+ min = tarval_convert_to(min, mode);
+ info->switch_min = min;
+ info->switch_max = tarval_convert_to(info->switch_max, mode);
+ needs_normalize = true;
}
/* normalize so switch_min is at 0 */
- if (info->switch_min != 0) {
- dbg_info *dbgi = get_irn_dbg_info(switchn);
- ir_node *min_const;
+ if (min != get_mode_null(mode)) {
+ ir_node *min_const = new_r_Const(irg, min);
+ dbg_info *dbgi = get_irn_dbg_info(switchn);
+ selector = new_rd_Sub(dbgi, block, selector, min_const, mode);
- delta = new_tarval_from_long(info->switch_min, mode);
+ info->switch_max = tarval_sub(info->switch_max, min, mode);
+ info->switch_min = get_mode_null(mode);
+ delta = min;
- min_const = new_r_Const(irg, delta);
- selector = new_rd_Sub(dbgi, block, selector, min_const, mode);
+ needs_normalize = true;
+ }
- info->switch_max -= info->switch_min;
- info->switch_min = 0;
+ /* if we have a selector_mode set, then the we will have a switch node,
+ * we have to construct an out-of-bounds check then and after that convert
+ * the switch/selector to the backends desired switch mode */
+ if (selector_mode != NULL) {
+ set_Switch_selector(switchn, selector);
+ create_out_of_bounds_check(info);
+
+ selector = new_r_Conv(block, selector, selector_mode);
+ mode = selector_mode;
+ info->switch_min = tarval_convert_to(info->switch_min, mode);
+ info->switch_max = tarval_convert_to(info->switch_max, mode);
+ if (delta != NULL)
+ delta = tarval_convert_to(delta, mode);
+ needs_normalize = true;
}
- if (delta != NULL || change_mode) {
+ if (needs_normalize) {
set_Switch_selector(switchn, selector);
normalize_table(switchn, mode, delta);
}
}
}
-static void create_out_of_bounds_check(switch_info_t *info)
-{
- ir_node *switchn = info->switchn;
- ir_graph *irg = get_irn_irg(switchn);
- dbg_info *dbgi = get_irn_dbg_info(switchn);
- ir_node *selector = get_Switch_selector(switchn);
- ir_node *block = get_nodes_block(switchn);
- ir_mode *cmp_mode = get_irn_mode(selector);
- ir_node **default_preds = NEW_ARR_F(ir_node*, 0);
- ir_node *default_block = NULL;
- ir_node *max_const;
- ir_node *proj_true;
- ir_node *proj_false;
- ir_node *cmp;
- ir_node *oob_cond;
- ir_node *in[1];
- ir_node *new_block;
- int i;
- ir_node *proj;
- size_t n_default_preds;
-
- assert(info->switch_min == 0);
-
- /* check for out-of-bounds */
- max_const = new_r_Const_long(irg, cmp_mode, info->switch_max);
- cmp = new_rd_Cmp(dbgi, block, selector, max_const, ir_relation_less_equal);
- oob_cond = new_rd_Cond(dbgi, block, cmp);
- proj_true = new_r_Proj(oob_cond, mode_X, pn_Cond_true);
- proj_false = new_r_Proj(oob_cond, mode_X, pn_Cond_false);
-
- ARR_APP1(ir_node*, default_preds, proj_false);
-
- /* create new block containing the switch */
- in[0] = proj_true;
- new_block = new_r_Block(irg, 1, in);
- set_nodes_block(switchn, new_block);
-
- /* adjust projs */
- foreach_out_irn(switchn, i, proj) {
- long pn = get_Proj_proj(proj);
- if (pn == pn_Switch_default) {
- assert(default_block == NULL);
- default_block = get_irn_out(proj, 0);
- ARR_APP1(ir_node*, default_preds, proj);
- }
- set_nodes_block(proj, new_block);
- }
-
- /* adapt default block */
- n_default_preds = ARR_LEN(default_preds);
- if (n_default_preds > 1) {
- /* create new intermediate blocks so we don't have critical edges */
- size_t p;
- for (p = 0; p < n_default_preds; ++p) {
- ir_node *pred = default_preds[p];
- ir_node *split_block;
- ir_node *block_in[1];
-
- block_in[0] = pred;
- split_block = new_r_Block(irg, 1, block_in);
-
- default_preds[p] = new_r_Jmp(split_block);
- }
- }
- set_irn_in(default_block, n_default_preds, default_preds);
-
- DEL_ARR_F(default_preds);
-
- clear_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE
- | IR_GRAPH_STATE_VALID_EXTENDED_BLOCKS);
-}
-
/**
* Block-Walker: searches for Switch nodes
*/
ir_node *projx;
ir_node *switchn;
switch_info_t info;
- unsigned long spare;
- bool lower_switch = false;
- bool could_analyze;
/* because we split critical blocks only blocks with 1 predecessors may
* contain Proj->Cond nodes */
return;
ir_nodeset_insert(&env->processed, switchn);
- could_analyze = analyse_switch0(&info, switchn);
- /* the code can't handle values which are not representable in the host */
- if (!could_analyze) {
- ir_fprintf(stderr, "libfirm warning: Couldn't analyse %+F (this could go wrong in the backend)\n", switchn);
- return;
- }
+ analyse_switch0(&info, switchn);
/*
* Here we have: num_cases and [switch_min, switch_max] interval.
* We do an if-cascade if there are too many spare numbers.
*/
- spare = (unsigned long) info.switch_max
- - (unsigned long) info.switch_min
- - (unsigned long) info.num_cases + 1;
- lower_switch |= spare >= env->spare_size;
- lower_switch |= info.num_cases <= env->small_switch;
+ ir_mode *mode = get_irn_mode(get_Switch_selector(switchn));
+ ir_tarval *spare = tarval_sub(info.switch_max, info.switch_min, mode);
+ mode = find_unsigned_mode(mode);
+ spare = tarval_convert_to(spare, mode);
+ ir_tarval *num_cases_minus_one
+ = new_tarval_from_long(info.num_cases-1, mode);
+ spare = tarval_sub(spare, num_cases_minus_one, mode);
+ ir_tarval *spare_size = new_tarval_from_long(env->spare_size, mode);
+ bool lower_switch = (info.num_cases <= env->small_switch
+ || (tarval_cmp(spare, spare_size) & ir_relation_greater_equal));
if (!lower_switch) {
- /* we won't decompose the switch. But we might have to add
- * out-of-bounds checking */
- if (!env->allow_out_of_bounds) {
- normalize_switch(&info);
- create_out_of_bounds_check(&info);
- }
+ /* we won't decompose the switch. But we must add an out-of-bounds
+ * check */
+ normalize_switch(&info, env->selector_mode);
return;
}
- normalize_switch(&info);
+ normalize_switch(&info, NULL);
analyse_switch1(&info);
/* Now create the if cascade */
- env->changed = true;
+ env->changed = true;
info.defusers = NEW_ARR_F(ir_node*, 0);
- block = get_nodes_block(switchn);
+ block = get_nodes_block(switchn);
create_if_cascade(&info, block, info.cases, info.num_cases);
/* Connect new default case users */
DEL_ARR_F(info.defusers);
xfree(info.cases);
- clear_irg_state(get_irn_irg(block), IR_GRAPH_STATE_NO_CRITICAL_EDGES
- | IR_GRAPH_STATE_CONSISTENT_DOMINANCE
- | IR_GRAPH_STATE_VALID_EXTENDED_BLOCKS);
+ clear_irg_properties(get_irn_irg(block), IR_GRAPH_PROPERTY_NO_CRITICAL_EDGES
+ | IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
}
void lower_switch(ir_graph *irg, unsigned small_switch, unsigned spare_size,
- int allow_out_of_bounds)
+ ir_mode *selector_mode)
{
+ if (mode_is_signed(selector_mode))
+ panic("expected unsigned mode for switch selector");
+
walk_env_t env;
- env.changed = false;
+ env.selector_mode = selector_mode;
env.spare_size = spare_size;
env.small_switch = small_switch;
- env.allow_out_of_bounds = allow_out_of_bounds;
+ env.changed = false;
ir_nodeset_init(&env.processed);
remove_critical_cf_edges(irg);
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