-/**
- * @file becopyheur4.c
- * @brief Simple copy minimization heuristics.
- * @author 27.04.2007
- * @version $Id$
- * @license
- *
- * Copyrigth (C) 1995-2007 University of Karlsruhe. All right reserved.
+/*
+ * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
- *
- * @summary
+ */
+
+/**
+ * @file
+ * @brief Simple copy minimization heuristics.
+ * @author Christian Wuerdig
+ * @date 27.04.2007
+ * @version $Id$
*
* This is the C implementation of the mst algorithm
* originally written in Java by Sebastian Hack.
* (also known as "heur3" :)
* Performs simple copy minimization.
*/
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include "xmalloc.h"
#include "pdeq.h"
#include "irprintf.h"
+#include "irbitset.h"
#include "bearch.h"
#include "beifg.h"
#include "be_t.h"
#include "becopyopt_t.h"
-#include "irbitset.h"
#define COL_COST_INFEASIBLE DBL_MAX
#define AFF_NEIGHBOUR_FIX_BENEFIT 128.0
/* stores coalescing related information for a node */
typedef struct _co_mst_irn_t {
- ir_node *irn;
- aff_chunk_t *chunk;
- bitset_t *adm_colors;
- int int_neigh;
- int col;
- int init_col;
- int tmp_col;
- unsigned fixed : 1;
- unsigned tmp_fixed : 1;
+ ir_node *irn; /**< the irn this information belongs to */
+ aff_chunk_t *chunk; /**< the chunk this irn belongs to */
+ bitset_t *adm_colors; /**< set of admissible colors for this irn */
+ ir_node **int_neighs; /**< ARR_D of all interfering neighbours (cached for speed reasons) */
+ int int_aff_neigh; /**< number of interfering affinity neighbours */
+ int col; /**< color currently assigned */
+ int init_col; /**< the initial color */
+ int tmp_col; /**< a temporary assigned color */
+ unsigned fixed : 1; /**< the color is fixed */
+ unsigned tmp_fixed : 1; /**< the color is temporary fixed */
} co_mst_irn_t;
#define get_co_mst_irn(mst_env, irn) (phase_get_or_set_irn_data(&(mst_env)->ph, (irn)))
ir_fprintf(stderr, "}");
}
+/**
+ * Dump all admissible colors to stderr.
+ */
static void dbg_admissible_colors(co_mst_env_t *env, co_mst_irn_t *node) {
int idx;
if (bitset_popcnt(node->adm_colors) < 1)
}
}
+/**
+ * Dump color-cost pairs to stderr.
+ */
static void dbg_col_cost(co_mst_env_t *env, col_cost_t *cost) {
int i;
for (i = 0; i < env->n_regs; ++i) {
if (res != old) {
const arch_register_req_t *req;
-
- res->irn = irn;
- res->chunk = new_aff_chunk(env);
- res->fixed = 0;
- res->tmp_fixed = 0;
- res->tmp_col = -1;
- res->int_neigh = 0;
- res->col = arch_register_get_index(arch_get_irn_register(env->aenv, irn));
- res->init_col = res->col;
+ void *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
+ ir_node *neigh;
+ unsigned len;
+
+ res->irn = irn;
+ res->chunk = new_aff_chunk(env);
+ res->fixed = 0;
+ res->tmp_fixed = 0;
+ res->tmp_col = -1;
+ res->int_neighs = NULL;
+ res->int_aff_neigh = 0;
+ res->col = arch_register_get_index(arch_get_irn_register(env->aenv, irn));
+ res->init_col = res->col;
/* add note to new chunk */
aff_chunk_add_node(res->chunk, res);
bitset_andnot(res->adm_colors, env->ignore_regs);
/* set the number of interfering affinity neighbours to -1, they are calculated later */
- res->int_neigh = -1;
+ res->int_aff_neigh = -1;
+
+ /* build list of interfering neighbours */
+ len = 0;
+ /* count them first as an obstack array cannot be extended */
+ be_ifg_foreach_neighbour(env->ifg, nodes_it, irn, neigh)
+ len++;
+ res->int_neighs = NEW_ARR_D(ir_node *, phase_obst(ph), len);
+ len = 0;
+ be_ifg_foreach_neighbour(env->ifg, nodes_it, irn, neigh)
+ res->int_neighs[len++] = neigh;
}
return res;
}
* Check if affinity chunk @p chunk interferes with node @p irn.
*/
static INLINE int aff_chunk_interferes(co_mst_env_t *env, aff_chunk_t *chunk, ir_node *irn) {
- void *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
- ir_node *neigh;
+ co_mst_irn_t *node = get_co_mst_irn(env, irn);
+ ir_node *neigh;
+ int i;
- be_ifg_foreach_neighbour(env->ifg, nodes_it, irn, neigh) {
+ for (i = 0; i < ARR_LEN(node->int_neighs); ++i) {
+ neigh = node->int_neighs[i];
if (! arch_irn_is(env->aenv, neigh, ignore) && bitset_is_set(chunk->nodes, get_irn_idx(neigh)))
return 1;
}
}
/**
- * Count the number of interfering affinity neighbors
+ * Count the number of interfering affinity neighbours
*/
static int count_interfering_aff_neighs(co_mst_env_t *env, affinity_node_t *an) {
- neighb_t *neigh;
- void *neigh_it = be_ifg_neighbours_iter_alloca(env->ifg);
- ir_node *irn = an->irn;
- int res = 0;
+ neighb_t *neigh;
+ ir_node *irn = an->irn;
+ co_mst_irn_t *node = get_co_mst_irn(env, irn);
+ int res = 0;
co_gs_foreach_neighb(an, neigh) {
- ir_node *m, *n = neigh->irn;
+ ir_node *n = neigh->irn;
+ int i;
/* skip ignore nodes */
if (arch_irn_is(env->aenv, n, ignore))
continue;
- /* check if the affinity neighbor interfere */
- be_ifg_foreach_neighbour(env->ifg, neigh_it, irn, m) {
- if (m == n) {
+ /* check if the affinity neighbour interfere */
+ for (i = 0; i < ARR_LEN(node->int_neighs); ++i) {
+ if (node->int_neighs[i] == n) {
++res;
break;
}
if (an != NULL) {
neighb_t *neigh;
- if (n1->int_neigh < 0)
- n1->int_neigh = count_interfering_aff_neighs(env, an);
+ if (n1->int_aff_neigh < 0)
+ n1->int_aff_neigh = count_interfering_aff_neighs(env, an);
co_gs_foreach_neighb(an, neigh) {
ir_node *m = neigh->irn;
int m_idx = get_irn_idx(m);
/* record the edge in only one direction */
if (n_idx < m_idx) {
co_mst_irn_t *n2;
- aff_edge_t edge;
+ aff_edge_t edge;
/* skip ignore nodes */
if (arch_irn_is(env->aenv, m, ignore))
edge.tgt = m;
n2 = get_co_mst_irn(env, m);
- if (n2->int_neigh < 0) {
+ if (n2->int_aff_neigh < 0) {
affinity_node_t *am = get_affinity_info(env->co, m);
- n2->int_neigh = count_interfering_aff_neighs(env, am);
+ n2->int_aff_neigh = count_interfering_aff_neighs(env, am);
}
- edge.weight = (double)neigh->costs / (double)(1 + n1->int_neigh + n2->int_neigh);
+ edge.weight = (double)neigh->costs / (double)(1 + n1->int_aff_neigh + n2->int_aff_neigh);
ARR_APP1(aff_edge_t, edges, edge);
}
}
* Determines the costs for each color if it would be assigned to node @p node.
*/
static void determine_color_costs(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs) {
- affinity_node_t *an = get_affinity_info(env->co, node->irn);
- void *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
+ affinity_node_t *an = get_affinity_info(env->co, node->irn);
neighb_t *aff_neigh;
- ir_node *int_neigh;
- int idx;
+ int idx, i;
col_cost_init(env, costs, 0.0);
}
/* calculate (positive) costs for interfering neighbours */
- be_ifg_foreach_neighbour(env->ifg, nodes_it, node->irn, int_neigh) {
+ for (i = 0; i < ARR_LEN(node->int_neighs); ++i) {
co_mst_irn_t *neigh;
int col, col_cnt;
+ ir_node *int_neigh;
+
+ int_neigh = node->int_neighs[i];
/* skip ignore nodes */
if (arch_irn_is(env->aenv, int_neigh, ignore))
static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs, waitq *changed_ones) {
int i;
waitq *local_changed = new_waitq();
- void *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
+ waitq *tmp = new_waitq();
DBG((env->dbg, LEVEL_1, "\tRecoloring %+F with color-costs", node->irn));
DBG_COL_COST(env, LEVEL_1, costs);
DB((env->dbg, LEVEL_1, "\n"));
for (i = 0; i < env->n_regs; ++i) {
- int tgt_col = costs[i].col;
- int neigh_ok = 1;
- ir_node *neigh;
+ int tgt_col = costs[i].col;
+ int neigh_ok = 1;
+ int j;
/* If the costs for that color (and all successive) are infinite, bail out we won't make it anyway. */
if (costs[i].cost == COL_COST_INFEASIBLE) {
node->tmp_fixed = 0;
del_waitq(local_changed);
+ del_waitq(tmp);
return 0;
}
waitq_put(local_changed, node);
/* try to color all interfering neighbours with current color forbidden */
- be_ifg_foreach_neighbour(env->ifg, nodes_it, node->irn, neigh) {
+ for (j = 0; j < ARR_LEN(node->int_neighs); ++j) {
co_mst_irn_t *nn;
+ ir_node *neigh;
+
+ neigh = node->int_neighs[j];
/* skip ignore nodes */
if (arch_irn_is(env->aenv, neigh, ignore))
we bail out and try the next color.
*/
if (get_mst_irn_col(nn) == tgt_col) {
- waitq *tmp = new_waitq();
-
/* try to color neighbour with tgt_col forbidden */
neigh_ok = change_node_color_excluded(env, nn, tgt_col, tmp);
/* join lists of changed nodes */
while (! waitq_empty(tmp))
waitq_put(local_changed, waitq_get(tmp));
- del_waitq(tmp);
if (! neigh_ok)
break;
while (! waitq_empty(local_changed))
waitq_put(changed_ones, waitq_get(local_changed));
del_waitq(local_changed);
+ del_waitq(tmp);
return 1;
}
else {
}
del_waitq(local_changed);
+ del_waitq(tmp);
return 0;
}
projects / libfirm / blobdiff