/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
/**
* @brief Use the strong normal form theorem (though it does not hold)
* @author Christoph Mallon
- * @version $Id: beschedrand.c 14604 2007-06-18 14:07:07Z matze $
+ * @version $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "belistsched.h"
#include "belive_t.h"
#include "beutil.h"
+#include "height.h"
#include "irtools.h"
#include "irgwalk.h"
+#include "benode_t.h"
// XXX there is no one time init for schedulers
//#define NORMAL_DBG
+static int must_be_scheduled(const ir_node* const irn)
+{
+ return !is_Proj(irn) && !is_Sync(irn);
+}
+
+
static const arch_env_t *cur_arch_env;
static int cost_cmp(const void* a, const void* b)
{
- const irn_cost_pair* a1 = a;
- const irn_cost_pair* b1 = b;
- return b1->cost - a1->cost;
+ const irn_cost_pair* const a1 = a;
+ const irn_cost_pair* const b1 = b;
+ int ret = b1->cost - a1->cost;
+#if defined NORMAL_DBG
+ ir_fprintf(stderr, "%+F %s %+F\n", a1->irn, ret < 0 ? "<" : ret > 0 ? ">" : "=", b1->irn);
+#endif
+ return ret;
}
}
+/* TODO high cost for store trees
+ */
+
+
static int normal_tree_cost(ir_node* irn)
{
flag_and_cost* fc = get_irn_link(irn);
ir_node* block = get_nodes_block(irn);
int arity = get_irn_arity(irn);
- int cost_max = 0;
- int count_max = 0;
int n_res;
int cost;
int n_op_res = 0;
int i;
+ if (be_is_Keep(irn))
+ return 0;
+
+ if (is_Proj(irn)) {
+ return normal_tree_cost(get_Proj_pred(irn));
+ }
+
if (fc == NULL) {
irn_cost_pair* costs;
int i;
ir_node* pred = get_irn_n(irn, i);
int cost;
- if (is_Phi(irn) || get_irn_mode(pred) == mode_M) {
+ if (is_Phi(irn) || get_irn_mode(pred) == mode_M || is_Block(pred)) {
cost = 0;
} else if (get_nodes_block(pred) != block) {
cost = 1;
} else {
flag_and_cost* pred_fc;
+ ir_node* real_pred;
cost = normal_tree_cost(pred);
if (be_is_Barrier(pred)) cost = 1; // XXX hack: the barrier causes all users to have a reguse of #regs
- pred_fc = get_irn_link(pred);
- pred_fc->no_root = 1;
+ if (!arch_irn_is(cur_arch_env, pred, ignore)) {
+ real_pred = (is_Proj(pred) ? get_Proj_pred(pred) : pred);
+ pred_fc = get_irn_link(real_pred);
+ pred_fc->no_root = 1;
#if defined NORMAL_DBG
- ir_fprintf(stderr, "%+F says that %+F is no root\n", irn, pred);
+ ir_fprintf(stderr, "%+F says that %+F is no root\n", irn, real_pred);
#endif
+ }
}
costs[i].irn = pred;
costs[i].cost = cost;
-
- if (cost > cost_max) {
- cost_max = cost;
- count_max = 1;
- } else if (cost == cost_max) {
- ++count_max;
- }
}
qsort(costs, arity, sizeof(*costs), cost_cmp);
set_irn_link(irn, fc);
- } else {
- irn_cost_pair* costs = fc->costs;
- int i;
-
- if (arity > 0) {
- cost_max = costs[0].cost;
-
- for (i = 0; i < arity; ++i) {
- if (costs[i].cost < cost_max) break;
- ++count_max;
- }
- }
}
cost = 0;
ir_fprintf(stderr, "cost walking node %+F\n", irn);
#endif
if (is_Block(irn)) return;
+ if (!must_be_scheduled(irn)) return;
normal_tree_cost(irn);
}
static void collect_roots(ir_node* irn, void* env)
{
- flag_and_cost* fc;
+ int is_root;
(void)env;
if (is_Block(irn)) return;
+ if (!must_be_scheduled(irn)) return;
- fc = get_irn_link(irn);
+ is_root = be_is_Keep(irn) || !((flag_and_cost*)get_irn_link(irn))->no_root;
#if defined NORMAL_DBG
- ir_fprintf(stderr, "%+F is %sroot\n", irn, fc->no_root ? "no " : "");
+ ir_fprintf(stderr, "%+F is %sroot\n", irn, is_root ? "" : "no ");
#endif
- if (!fc->no_root) {
+ if (is_root) {
ir_node* block = get_nodes_block(irn);
ir_node** roots = get_irn_link(block);
if (roots == NULL) {
int i;
if (irn_visited(irn)) return sched;
+ if (is_End(irn)) return sched;
- if (!is_Phi(irn)) {
+ if (!is_Phi(irn) && !be_is_Keep(irn)) {
for (i = 0; i < arity; ++i) {
ir_node* pred = irns[i].irn;
if (get_nodes_block(pred) != block) continue;
if (get_irn_mode(pred) == mode_M) continue;
+ if (is_Proj(pred)) pred = get_Proj_pred(pred);
sched = sched_node(sched, pred);
}
}
}
+static int root_cmp(const void* a, const void* b)
+{
+ const irn_cost_pair* const a1 = a;
+ const irn_cost_pair* const b1 = b;
+ int ret;
+ if (is_irn_forking(a1->irn)) {
+ ret = 1;
+ } else if (is_irn_forking(b1->irn)) {
+ ret = -1;
+ } else {
+ ret = b1->cost - a1->cost;
+ if (ret == 0) {
+ /* place live-out nodes later */
+ ret = (count_result(a1->irn) != 0) - (count_result(b1->irn) != 0);
+ }
+ }
+#if defined NORMAL_DBG
+ ir_fprintf(stderr, "%+F %s %+F\n", a1->irn, ret < 0 ? "<" : ret > 0 ? ">" : "=", b1->irn);
+#endif
+ return ret;
+}
+
+
static void normal_sched_block(ir_node* block, void* env)
{
- ir_node** roots = get_irn_link(block);
+ heights_t* heights = env;
+ ir_node** roots = get_irn_link(block);
int root_count;
irn_cost_pair* root_costs;
int i;
ir_node** sched;
- (void)env;
-
#if defined NORMAL_DBG
ir_fprintf(stderr, "sched walking block %+F\n", block);
#endif
NEW_ARR_A(irn_cost_pair, root_costs, root_count);
for (i = 0; i < root_count; ++i) {
root_costs[i].irn = roots[i];
- root_costs[i].cost = normal_tree_cost(roots[i]);
+ root_costs[i].cost = get_irn_height(heights, roots[i]);
+#if defined NORMAL_DBG
+ ir_fprintf(stderr, "height of %+F is %u\n", roots[i], root_costs[i].cost);
+#endif
}
- qsort(root_costs, root_count, sizeof(*root_costs), cost_cmp);
+ qsort(root_costs, root_count, sizeof(*root_costs), root_cmp);
+#if defined NORMAL_DBG
+ {
+ int n = root_count;
+ int i;
+
+ ir_fprintf(stderr, "Root Scheduling of %+F:\n", block);
+ for (i = 0; i < n; ++i) {
+ ir_fprintf(stderr, " %+F\n", root_costs[i].irn);
+ }
+ fprintf(stderr, "\n");
+ }
+#endif
sched = NEW_ARR_F(ir_node*, 0);
for (i = 0; i < root_count; ++i) {
ir_node* irn = root_costs[i].irn;
+ assert(must_be_scheduled(irn));
sched = sched_node(sched, irn);
}
set_irn_link(block, sched);
static void *normal_init_graph(const list_sched_selector_t *vtab,
const be_irg_t *birg)
{
- ir_graph* irg = be_get_birg_irg(birg);
+ ir_graph *irg = be_get_birg_irg(birg);
+ heights_t *heights;
(void)vtab;
be_clear_links(irg);
+ heights = heights_new(irg);
+
irg_walk_graph(irg, normal_cost_walker, NULL, NULL);
irg_walk_graph(irg, collect_roots, NULL, NULL);
inc_irg_visited(irg);
- irg_block_walk_graph(irg, normal_sched_block, NULL, NULL);
+ irg_block_walk_graph(irg, normal_sched_block, NULL, heights);
+
+ heights_free(heights);
return NULL;
}
projects / libfirm / blobdiff