* @date 20.10.2004
* @author Sebastian Hack
*/
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
+#include <limits.h>
+
+#include "benode_t.h"
-#include "fourcc.h"
#include "obst.h"
-#include "irouts.h"
+#include "list.h"
+#include "iterator.h"
+
+#include "iredges_t.h"
#include "irgwalk.h"
#include "irnode_t.h"
#include "irmode_t.h"
-#include "list.h"
-#include "iterator.h"
#include "irdump.h"
#include "irprintf_t.h"
+#include "array.h"
#include "debug.h"
+#include "irtools.h"
#include "besched_t.h"
#include "beutil.h"
+#include "belive_t.h"
#include "belistsched.h"
+#include "beschedmris.h"
+#include "bearch.h"
+#include "bestat.h"
+
+/**
+ * All scheduling info needed per node.
+ */
+typedef struct _sched_irn_t {
+ sched_timestep_t delay; /**< The delay for this node if already calculated, else 0. */
+ sched_timestep_t etime; /**< The earliest time of this node. */
+ unsigned already_sched : 1; /**< Set if this node is already scheduled */
+ unsigned is_root : 1; /**< is a root node of a block */
+} sched_irn_t;
/**
* Scheduling environment for the whole graph.
*/
typedef struct _sched_env_t {
- const ir_graph *irg; /**< The graph to schedule. */
- const list_sched_selector_t *selector; /**< The node selector. */
- void *selector_env; /**< A pointer to give to the selector. */
+ sched_irn_t *sched_info; /**< scheduling info per node */
+ const list_sched_selector_t *selector; /**< The node selector. */
+ const arch_env_t *arch_env; /**< The architecture environment. */
+ const ir_graph *irg; /**< The graph to schedule. */
+ void *selector_env; /**< A pointer to give to the selector. */
} sched_env_t;
-static ir_node *trivial_select(void *env, void *block_env, const struct list_head *sched_head,
- int curr_time, pset *ready_set)
+#if 0
+/*
+ * Ugly global variable for the compare function
+ * since qsort(3) does not pass an extra pointer.
+ */
+static ir_node *curr_bl = NULL;
+
+static int cmp_usage(const void *a, const void *b)
+{
+ struct trivial_sched_env *env;
+ const ir_node *p = a;
+ const ir_node *q = b;
+ int res = 0;
+
+ res = is_live_end(env->curr_bl, a) - is_live_end(env->curr_bl, b);
+
+ /*
+ * One of them is live at the end of the block.
+ * Then, that one shall be scheduled at after the other
+ */
+ if(res != 0)
+ return res;
+
+
+ return res;
+}
+#endif
+
+/**
+ * The trivial selector:
+ * Just assure that branches are executed last, otherwise select
+ * the first node ready.
+ */
+static ir_node *trivial_select(void *block_env, nodeset *ready_set)
+{
+ const arch_env_t *arch_env = block_env;
+ ir_node *irn = NULL;
+ int const_last = 0;
+
+ /* assure that branches and constants are executed last */
+ for (irn = nodeset_first(ready_set); irn; irn = nodeset_next(ready_set)) {
+ arch_irn_class_t irn_class = arch_irn_classify(arch_env, irn);
+
+ if (! arch_irn_class_is(arch_env, irn, branch) && (const_last ? (! arch_irn_class_is(arch_env, irn, const)) : 1)) {
+ nodeset_break(ready_set);
+ return irn;
+ }
+ }
+
+ /* assure that constants are executed before branches */
+ if (const_last) {
+ for (irn = nodeset_first(ready_set); irn; irn = nodeset_next(ready_set)) {
+ if (! arch_irn_class_is(arch_env, irn, branch)) {
+ nodeset_break(ready_set);
+ return irn;
+ }
+ }
+ }
+
+
+ /* at last: schedule branches */
+ irn = nodeset_first(ready_set);
+ nodeset_break(ready_set);
+
+ return irn;
+}
+
+static void *trivial_init_graph(const list_sched_selector_t *vtab, const arch_env_t *arch_env, ir_graph *irg)
{
- ir_node *res = pset_first(ready_set);
- pset_break(ready_set);
- return res;
+ return (void *) arch_env;
+}
+
+static void *trivial_init_block(void *graph_env, ir_node *bl)
+{
+ return graph_env;
+}
+
+static INLINE int must_appear_in_schedule(const list_sched_selector_t *sel, void *block_env, const ir_node *irn)
+{
+ int res = -1;
+
+ if(sel->to_appear_in_schedule)
+ res = sel->to_appear_in_schedule(block_env, irn);
+
+ return res >= 0 ? res : (to_appear_in_schedule(irn) || be_is_Keep(irn) || be_is_RegParams(irn));
}
static const list_sched_selector_t trivial_selector_struct = {
- NULL,
- NULL,
+ trivial_init_graph,
+ trivial_init_block,
trivial_select,
- NULL,
- NULL
+ NULL, /* to_appear_in_schedule */
+ NULL, /* exectime */
+ NULL, /* latency */
+ NULL, /* finish_block */
+ NULL /* finish_graph */
};
const list_sched_selector_t *trivial_selector = &trivial_selector_struct;
-static void list_sched_block(ir_node *block, void *env_ptr);
+typedef struct _usage_stats_t {
+ ir_node *irn;
+ struct _usage_stats_t *next;
+ int max_hops;
+ int uses_in_block; /**< Number of uses inside the current block. */
+ int already_consumed; /**< Number of insns using this value already
+ scheduled. */
+} usage_stats_t;
+
+typedef struct {
+ const list_sched_selector_t *vtab;
+ const arch_env_t *arch_env;
+} reg_pressure_main_env_t;
+
+typedef struct {
+ struct obstack obst;
+ const reg_pressure_main_env_t *main_env;
+ usage_stats_t *root;
+ nodeset *already_scheduled;
+} reg_pressure_selector_env_t;
+
+static INLINE usage_stats_t *get_or_set_usage_stats(reg_pressure_selector_env_t *env, ir_node *irn)
+{
+ usage_stats_t *us = get_irn_link(irn);
+
+ if(!us) {
+ us = obstack_alloc(&env->obst, sizeof(us[0]));
+ us->irn = irn;
+ us->already_consumed = 0;
+ us->max_hops = INT_MAX;
+ us->next = env->root;
+ env->root = us;
+ set_irn_link(irn, us);
+ }
+
+ return us;
+}
+
+static INLINE usage_stats_t *get_usage_stats(ir_node *irn)
+{
+ usage_stats_t *us = get_irn_link(irn);
+ assert(us && "This node must have usage stats");
+ return us;
+}
+
+static int max_hops_walker(reg_pressure_selector_env_t *env, ir_node *irn, ir_node *curr_bl, int depth, unsigned visited_nr)
+{
+ ir_node *bl = get_nodes_block(irn);
+ /*
+ * If the reached node is not in the block desired,
+ * return the value passed for this situation.
+ */
+ if(get_nodes_block(irn) != bl)
+ return block_dominates(bl, curr_bl) ? 0 : INT_MAX;
+
+ /*
+ * If the node is in the current block but not
+ * yet scheduled, we keep on searching from that node.
+ */
+ if(!nodeset_find(env->already_scheduled, irn)) {
+ int i, n;
+ int res = 0;
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *operand = get_irn_n(irn, i);
+
+ if(get_irn_visited(operand) < visited_nr) {
+ int tmp;
+
+ set_irn_visited(operand, visited_nr);
+ tmp = max_hops_walker(env, operand, bl, depth + 1, visited_nr);
+ res = MAX(tmp, res);
+ }
+ }
+
+ return res;
+ }
+
+ /*
+ * If the node is in the current block and scheduled, return
+ * the depth which indicates the number of steps to the
+ * region of scheduled nodes.
+ */
+ return depth;
+}
+
+static int compute_max_hops(reg_pressure_selector_env_t *env, ir_node *irn)
+{
+ ir_node *bl = get_nodes_block(irn);
+ ir_graph *irg = get_irn_irg(bl);
+ int res = 0;
+
+ const ir_edge_t *edge;
+
+ foreach_out_edge(irn, edge) {
+ ir_node *user = get_edge_src_irn(edge);
+ unsigned visited_nr = get_irg_visited(irg) + 1;
+ int max_hops;
+
+ set_irg_visited(irg, visited_nr);
+ max_hops = max_hops_walker(env, user, irn, 0, visited_nr);
+ res = MAX(res, max_hops);
+ }
+
+ return res;
+}
+
+static void *reg_pressure_graph_init(const list_sched_selector_t *vtab, const arch_env_t *arch_env, ir_graph *irg)
+{
+ reg_pressure_main_env_t *main_env = xmalloc(sizeof(main_env[0]));
+
+ main_env->arch_env = arch_env;
+ main_env->vtab = vtab;
+ irg_walk_graph(irg, firm_clear_link, NULL, NULL);
+
+ return main_env;
+}
+
+static void *reg_pressure_block_init(void *graph_env, ir_node *bl)
+{
+ ir_node *irn;
+ reg_pressure_selector_env_t *env = xmalloc(sizeof(env[0]));
+
+ obstack_init(&env->obst);
+ env->already_scheduled = new_nodeset(32);
+ env->root = NULL;
+ env->main_env = graph_env;
+
+ /*
+ * Collect usage statistics.
+ */
+ sched_foreach(bl, irn) {
+ if(must_appear_in_schedule(env->main_env->vtab, env, irn)) {
+ int i, n;
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ //ir_node *op = get_irn_n(irn, i);
+ if(must_appear_in_schedule(env->main_env->vtab, env, irn)) {
+ usage_stats_t *us = get_or_set_usage_stats(env, irn);
+#if 0 /* Liveness is not computed here! */
+ if(is_live_end(bl, op))
+ us->uses_in_block = 99999;
+ else
+#endif
+ us->uses_in_block++;
+ }
+ }
+ }
+ }
+
+ return env;
+}
-void list_sched(ir_graph *irg, const list_sched_selector_t *selector)
+static void reg_pressure_block_free(void *block_env)
{
- sched_env_t env;
+ reg_pressure_selector_env_t *env = block_env;
+ usage_stats_t *us;
- memset(&env, 0, sizeof(env));
- env.selector = selector;
- env.selector_env = selector->init_graph ? selector->init_graph(irg) : NULL;
- env.irg = irg;
+ for(us = env->root; us; us = us->next)
+ set_irn_link(us->irn, NULL);
- /* Normalize proj nodes. */
- normalize_proj_nodes(irg);
+ obstack_free(&env->obst, NULL);
+ del_nodeset(env->already_scheduled);
+ free(env);
+}
- /* Compute the outs */
- if(get_irg_outs_state(irg) != outs_consistent)
- compute_outs(irg);
+static int get_result_hops_sum(reg_pressure_selector_env_t *env, ir_node *irn)
+{
+ int res = 0;
+ if(get_irn_mode(irn) == mode_T) {
+ const ir_edge_t *edge;
+
+ foreach_out_edge(irn, edge)
+ res += get_result_hops_sum(env, get_edge_src_irn(edge));
+ }
- /* Dump the graph. */
- //dump_ir_block_graph(irg, "-before-sched");
+ else if(mode_is_data(get_irn_mode(irn)))
+ res = compute_max_hops(env, irn);
- /* Schedule each single block. */
- irg_block_walk_graph(irg, list_sched_block, NULL, &env);
- if(selector->finish_graph)
- selector->finish_graph(env.selector_env, irg);
+ return res;
}
+static INLINE int reg_pr_costs(reg_pressure_selector_env_t *env, ir_node *irn)
+{
+ int i, n;
+ int sum = 0;
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *op = get_irn_n(irn, i);
+
+ if(must_appear_in_schedule(env->main_env->vtab, env, op))
+ sum += compute_max_hops(env, op);
+ }
+
+ sum += get_result_hops_sum(env, irn);
+
+ return sum;
+}
+
+static ir_node *reg_pressure_select(void *block_env, nodeset *ready_set)
+{
+ reg_pressure_selector_env_t *env = block_env;
+ ir_node *irn, *res = NULL;
+ int curr_cost = INT_MAX;
+
+ assert(nodeset_count(ready_set) > 0);
+
+ for (irn = nodeset_first(ready_set); irn; irn = nodeset_next(ready_set)) {
+ /*
+ Ignore branch instructions for the time being.
+ They should only be scheduled if there is nothing else.
+ */
+ if (! arch_irn_class_is(env->main_env->arch_env, irn, branch)) {
+ int costs = reg_pr_costs(env, irn);
+ if (costs <= curr_cost) {
+ res = irn;
+ curr_cost = costs;
+ }
+ }
+ }
+
+ /*
+ There was no result so we only saw a branch.
+ Take it and finish.
+ */
+
+ if(!res) {
+ res = nodeset_first(ready_set);
+ nodeset_break(ready_set);
+
+ assert(res && "There must be a node scheduled.");
+ }
+
+ nodeset_insert(env->already_scheduled, res);
+ return res;
+}
/**
* Environment for a block scheduler.
*/
typedef struct _block_sched_env_t {
- int curr_time;
- pset *ready_set;
- pset *already_scheduled;
- ir_node *block;
- firm_dbg_module_t *dbg;
+ sched_irn_t *sched_info; /**< scheduling info per node, copied from the global scheduler object */
+ sched_timestep_t curr_time; /**< current time of the scheduler */
+ nodeset *cands; /**< the set of candidates */
+ ir_node *block; /**< the current block */
+ sched_env_t *sched_env; /**< the scheduler environment */
+ const list_sched_selector_t *selector;
+ void *selector_block_env;
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
} block_sched_env_t;
+/**
+ * Returns non-zero if the node is already scheduled
+ */
+static INLINE int is_already_scheduled(block_sched_env_t *env, ir_node *n)
+{
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].already_sched;
+}
+
+/**
+ * Mark a node as already scheduled
+ */
+static INLINE void mark_already_scheduled(block_sched_env_t *env, ir_node *n)
+{
+ int idx = get_irn_idx(n);
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].already_sched = 1;
+}
+/**
+ * Returns non-zero if the node is a root node
+ */
+static INLINE unsigned is_root_node(block_sched_env_t *env, ir_node *n)
+{
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].is_root;
+}
+
+/**
+ * Mark a node as roto node
+ */
+static INLINE void mark_root_node(block_sched_env_t *env, ir_node *n)
+{
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].is_root = 1;
+}
+
+/**
+ * Get the current delay.
+ */
+static sched_timestep_t get_irn_delay(block_sched_env_t *env, ir_node *n) {
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].delay;
+}
+
+/**
+ * Set the current delay.
+ */
+static void set_irn_delay(block_sched_env_t *env, ir_node *n, sched_timestep_t delay) {
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].delay = delay;
+}
+
+/**
+ * Get the current etime.
+ */
+static sched_timestep_t get_irn_etime(block_sched_env_t *env, ir_node *n) {
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].etime;
+}
+
+/**
+ * Set the current etime.
+ */
+static void set_irn_etime(block_sched_env_t *env, ir_node *n, sched_timestep_t etime) {
+ int idx = get_irn_idx(n);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].etime = etime;
+}
+
+/**
+ * returns the exec-time for node n.
+ */
+static sched_timestep_t exectime(sched_env_t *env, ir_node *n) {
+ if (be_is_Keep(n) || is_Proj(n))
+ return 0;
+ if (env->selector->exectime)
+ return env->selector->exectime(env->selector_env, n);
+ return 1;
+}
+
+/**
+ * Calculates the latency for between two ops
+ */
+static sched_timestep_t latency(sched_env_t *env, ir_node *pred, int pred_cycle, ir_node *curr, int curr_cycle) {
+ /* a Keep hides a root */
+ if (be_is_Keep(curr))
+ return exectime(env, pred);
+
+ /* Proj's are executed immediately */
+ if (is_Proj(curr))
+ return 0;
+
+ /* predecessors Proj's must be skipped */
+ if (is_Proj(pred))
+ pred = get_Proj_pred(pred);
+
+ if (env->selector->latency)
+ return env->selector->latency(env->selector_env, pred, pred_cycle, curr, curr_cycle);
+ return 1;
+}
/**
* Try to put a node in the ready set.
- * @param env The block scheduler environment.
- * @param irn The node to make ready.
+ * @param env The block scheduler environment.
+ * @param pred The previous scheduled node.
+ * @param irn The node to make ready.
* @return 1, if the node could be made ready, 0 else.
*/
-static INLINE int make_ready(block_sched_env_t *env, ir_node *irn)
+static INLINE int make_ready(block_sched_env_t *env, ir_node *pred, ir_node *irn)
{
int i, n;
+ sched_timestep_t etime_p, etime;
/* Blocks cannot be scheduled. */
- if(is_Block(irn))
+ if (is_Block(irn))
return 0;
/*
* Check, if the given ir node is in a different block as the
* currently scheduled one. If that is so, don't make the node ready.
*/
- if(env->block != get_nodes_block(irn))
+ if (env->block != get_nodes_block(irn))
return 0;
- for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ for (i = 0, n = get_irn_arity(irn); i < n; ++i) {
ir_node *op = get_irn_n(irn, i);
+ /* if irn is an End we have keep-alives and op might be a block, skip that */
+ if (is_Block(op)) {
+ assert(get_irn_op(irn) == op_End);
+ continue;
+ }
+
/* If the operand is local to the scheduled block and not yet
* scheduled, this nodes cannot be made ready, so exit. */
- if(!pset_find_ptr(env->already_scheduled, op) && get_nodes_block(op) == env->block)
+ if (!is_already_scheduled(env, op) && get_nodes_block(op) == env->block)
return 0;
}
- DBG((env->dbg, LEVEL_2, "\tmaking ready: %+F\n", irn));
- pset_insert_ptr(env->ready_set, irn);
+ nodeset_insert(env->cands, irn);
- return 1;
-}
+ /* calculate the etime of this node */
+ etime = env->curr_time;
+ if (pred) {
+ etime_p = get_irn_etime(env, pred);
+ etime += latency(env->sched_env, pred, 1, irn, 0);
-/**
- * Check, if a node is ready in a block schedule.
- * @param env The block schedule environment.
- * @param irn The node to check for.
- * @return 1 if the node was ready, 0 if not.
- */
-#define is_ready(env,irn) \
- (pset_find_ptr((env)->ready_set, irn) != NULL)
+ etime = etime_p > etime ? etime_p : etime;
+ }
-/**
- * Check, if a node has already been schedules.
- * @param env The block schedule environment.
- * @param irn The node to check for.
- * @return 1 if the node was already scheduled, 0 if not.
- */
-#define is_scheduled(env,irn) \
- (pset_find_ptr((env)->already_scheduled, irn) != NULL)
+ set_irn_etime(env, irn, etime);
+
+ DB((env->dbg, LEVEL_2, "\tmaking ready: %+F etime %u\n", irn, etime));
+
+ return 1;
+}
/**
* Try, to make all users of a node ready.
*/
static INLINE void make_users_ready(block_sched_env_t *env, ir_node *irn)
{
- int i, n;
-
- for(i = 0, n = get_irn_n_outs(irn); i < n; ++i) {
- ir_node *user = get_irn_out(irn, i);
- if(!is_Phi(user))
- make_ready(env, user);
- }
-}
+ const ir_edge_t *edge;
-/**
- * Compare to nodes using pointer equality.
- * @param p1 Node one.
- * @param p2 Node two.
- * @return 0 if they are identical.
- */
-static int node_cmp_func(const void *p1, const void *p2)
-{
- return p1 != p2;
+ foreach_out_edge(irn, edge) {
+ ir_node *user = edge->src;
+ if(!is_Phi(user))
+ make_ready(env, irn, user);
+ }
}
/**
* Append an instruction to a schedule.
- * @param env The block scheduleing environment.
+ * @param env The block scheduling environment.
* @param irn The node to add to the schedule.
- * @return The given node.
+ * @return The given node.
*/
static ir_node *add_to_sched(block_sched_env_t *env, ir_node *irn)
{
/* If the node consumes/produces data, it is appended to the schedule
* list, otherwise, it is not put into the list */
- if(to_appear_in_schedule(irn)) {
+ if(must_appear_in_schedule(env->selector, env->selector_block_env, irn)) {
sched_info_t *info = get_irn_sched_info(irn);
INIT_LIST_HEAD(&info->list);
info->scheduled = 1;
}
/* Insert the node in the set of all already scheduled nodes. */
- pset_insert_ptr(env->already_scheduled, irn);
+ mark_already_scheduled(env, irn);
/* Remove the node from the ready set */
- if(pset_find_ptr(env->ready_set, irn))
- pset_remove_ptr(env->ready_set, irn);
+ if(nodeset_find(env->cands, irn))
+ nodeset_remove(env->cands, irn);
return irn;
}
-
/**
* Add the proj nodes of a tuple-mode irn to the schedule immediately
* after the tuple-moded irn. By pinning the projs after the irn, no
* values.
*
* @param irn The tuple-moded irn.
- * @param list The schedule list to append all the projs.
- * @param time The time step to which the irn and all its projs are
- * related to.
- * @param obst The obstack the scheduling data structures shall be
- * created upon.
- * @param ready_set The ready set of the list scheduler.
- * @param already_scheduled A set containing all nodes already
- * scheduled.
*/
static void add_tuple_projs(block_sched_env_t *env, ir_node *irn)
{
- int i, n;
- assert(get_irn_mode(irn) == mode_T && "Mode of node must be tuple");
+ const ir_edge_t *edge;
- for(i = 0, n = get_irn_n_outs(irn); i < n; ++i) {
- ir_node *out = get_irn_out(irn, i);
+ assert(get_irn_mode(irn) == mode_T && "Mode of node must be tuple");
- assert(is_Proj(out) && "successor of a modeT node must be a proj");
+ if(is_Bad(irn))
+ return;
- if(get_irn_mode(out) == mode_T)
- add_tuple_projs(env, out);
- else {
- add_to_sched(env, out);
- make_users_ready(env, out);
- }
- }
+ foreach_out_edge(irn, edge) {
+ ir_node *out = edge->src;
+
+ assert(is_Proj(out) && "successor of a modeT node must be a proj");
+
+ if (get_irn_mode(out) == mode_T)
+ add_tuple_projs(env, out);
+ else {
+ add_to_sched(env, out);
+ make_users_ready(env, out);
+ }
+ }
+}
+
+/**
+ * Execute the heuristic function,
+ */
+static ir_node *select_node_heuristic(block_sched_env_t *be, nodeset *ns)
+{
+ ir_node *irn;
+
+ for (irn = nodeset_first(ns); irn; irn = nodeset_next(ns)) {
+ if (be_is_Keep(irn)) {
+ nodeset_break(ns);
+ return irn;
+ }
+ }
+
+ return be->selector->select(be->selector_block_env, ns);
+}
+
+/**
+ * Returns non-zero if root is a root in the block block.
+ */
+static int is_root(ir_node *root, ir_node *block) {
+ const ir_edge_t *edge;
+
+ foreach_out_edge(root, edge) {
+ ir_node *succ = get_edge_src_irn(edge);
+
+ if (is_Block(succ))
+ continue;
+ /* Phi nodes are always in "another block */
+ if (is_Phi(succ))
+ continue;
+ if (get_nodes_block(succ) == block)
+ return 0;
+ }
+ return 1;
+}
+
+/* we need a special mark */
+static char _mark;
+#define MARK &_mark
+
+static firm_dbg_module_t *xxxdbg;
+
+/**
+ * descent into a dag and create a pre-order list.
+ */
+static void descent(ir_node *root, ir_node *block, ir_node **list) {
+ int i;
+
+ if (! is_Phi(root)) {
+ /* Phi nodes always leave the block */
+ for (i = get_irn_arity(root) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(root, i);
+
+ DBG((xxxdbg, LEVEL_3, " node %+F\n", pred));
+ /* Blocks may happen as predecessors of End nodes */
+ if (is_Block(pred))
+ continue;
+
+ /* already seen nodes are not marked */
+ if (get_irn_link(pred) != MARK)
+ continue;
+
+ /* don't leave our block */
+ if (get_nodes_block(pred) != block)
+ continue;
+
+ set_irn_link(pred, NULL);
+
+ descent(pred, block, list);
+ }
+ }
+ set_irn_link(root, *list);
+ *list = root;
}
/**
* Also the outs must have been computed.
*
* @param block The block node.
- * @param env Schedulting environment.
+ * @param env Scheduling environment.
*/
static void list_sched_block(ir_node *block, void *env_ptr)
{
- void *block_env = NULL;
- sched_env_t *env = env_ptr;
- block_sched_env_t be;
+ sched_env_t *env = env_ptr;
const list_sched_selector_t *selector = env->selector;
+ ir_node *start_node = get_irg_start(get_irn_irg(block));
+ sched_info_t *info = get_irn_sched_info(block);
+ block_sched_env_t be;
+ const ir_edge_t *edge;
ir_node *irn;
- int i, n, j, m;
- int phi_seen = 0;
- sched_info_t *info = get_irn_sched_info(block);
+ int j, m;
+
+ ir_node *root = NULL, *preord = NULL;
+ ir_node *curr;
/* Initialize the block's list head that will hold the schedule. */
INIT_LIST_HEAD(&info->list);
/* Initialize the block scheduling environment */
- be.dbg = firm_dbg_register("firm.be.sched");
- be.block = block;
- be.curr_time = 0;
- be.ready_set = new_pset(node_cmp_func, get_irn_n_outs(block));
- be.already_scheduled = new_pset(node_cmp_func, get_irn_n_outs(block));
+ be.sched_info = env->sched_info;
+ be.block = block;
+ be.curr_time = 0;
+ be.cands = new_nodeset(get_irn_n_edges(block));
+ be.selector = selector;
+ be.sched_env = env;
+ FIRM_DBG_REGISTER(be.dbg, "firm.be.sched");
+ FIRM_DBG_REGISTER(xxxdbg, "firm.be.sched");
- firm_dbg_set_mask(be.dbg, 0);
+ // firm_dbg_set_mask(be.dbg, SET_LEVEL_3);
- if(selector->init_block)
- block_env = selector->init_block(env->selector_env, block);
+ if (selector->init_block)
+ be.selector_block_env = selector->init_block(env->selector_env, block);
DBG((be.dbg, LEVEL_1, "scheduling %+F\n", block));
+ /* First step: Find the root set. */
+ foreach_out_edge(block, edge) {
+ ir_node *succ = get_edge_src_irn(edge);
+
+ if (is_root(succ, block)) {
+ mark_root_node(&be, succ);
+ set_irn_link(succ, root);
+ root = succ;
+ }
+ else
+ set_irn_link(succ, MARK);
+ }
+
+ /* Second step: calculate the pre-order list. */
+ preord = NULL;
+ for (curr = root; curr; curr = irn) {
+ irn = get_irn_link(curr);
+ DBG((be.dbg, LEVEL_2, " DAG root %+F\n", curr));
+ descent(curr, block, &preord);
+ }
+ root = preord;
+
+ /* Third step: calculate the Delay. Note that our
+ * list is now in pre-order, starting at root
+ */
+ for (curr = root; curr; curr = get_irn_link(curr)) {
+ sched_timestep_t d;
+
+ if (arch_irn_class_is(env->arch_env, curr, branch)) {
+ /* assure, that branches can be executed last */
+ d = 0;
+ }
+ else {
+ if (is_root_node(&be, curr))
+ d = exectime(env, curr);
+ else {
+ d = 0;
+ foreach_out_edge(curr, edge) {
+ ir_node *n = get_edge_src_irn(edge);
+
+ if (get_nodes_block(n) == block) {
+ sched_timestep_t ld;
+
+ ld = latency(env, curr, 1, n, 0) + get_irn_delay(&be, n);
+ d = ld > d ? ld : d;
+ }
+ }
+ }
+ }
+ set_irn_delay(&be, curr, d);
+ DB((be.dbg, LEVEL_2, "\t%+F delay %u\n", curr, d));
+
+ /* set the etime of all nodes to 0 */
+ set_irn_etime(&be, curr, 0);
+ }
+
+
/* Then one can add all nodes are ready to the set. */
- for(i = 0, n = get_irn_n_outs(block); i < n; ++i) {
- ir_node *irn = get_irn_out(block, i);
+ foreach_out_edge(block, edge) {
+ ir_node *irn = get_edge_src_irn(edge);
/* Skip the end node because of keepalive edges. */
- if(get_irn_opcode(irn) == iro_End)
+ if (get_irn_opcode(irn) == iro_End)
continue;
- /* Phi functions are scheduled immediately, since they only transfer
- * data flow from the predecessors to this block. */
- if(is_Phi(irn)) {
+ if (is_Phi(irn)) {
+ /* Phi functions are scheduled immediately, since they only transfer
+ * data flow from the predecessors to this block. */
+
+ /* Increase the time step. */
+ be.curr_time += get_irn_etime(&be, irn);
add_to_sched(&be, irn);
make_users_ready(&be, irn);
- phi_seen = 1;
}
+ else if (irn == start_node) {
+ /* The start block will be scheduled as the first node */
+ be.curr_time += get_irn_etime(&be, irn);
- /* Other nodes must have all operands in other blocks to be made
- * ready */
+ add_to_sched(&be, irn);
+ add_tuple_projs(&be, irn);
+ }
else {
- bool ready = true;
+ /* Other nodes must have all operands in other blocks to be made
+ * ready */
+ int ready = 1;
/* Check, if the operands of a node are not local to this block */
- for(j = 0, m = get_irn_arity(irn); j < m; ++j) {
+ for (j = 0, m = get_irn_arity(irn); j < m; ++j) {
ir_node *operand = get_irn_n(irn, j);
- if(get_nodes_block(operand) == block) {
- ready = false;
+ if (get_nodes_block(operand) == block) {
+ ready = 0;
break;
}
}
/* Make the node ready, if all operands live in a foreign block */
- if(ready) {
+ if (ready) {
DBG((be.dbg, LEVEL_2, "\timmediately ready: %+F\n", irn));
- make_ready(&be, irn);
+ make_ready(&be, NULL, irn);
}
}
}
- /* Increase the time, if some phi functions have been scheduled */
- be.curr_time += phi_seen;
+ while (nodeset_count(be.cands) > 0) {
+ nodeset *mcands; /**< the set of candidates with maximum delay time */
+ nodeset *ecands; /**< the set of nodes in mcands whose etime <= curr_time */
+ sched_timestep_t max_delay = 0;
- while(pset_count(be.ready_set) > 0) {
- // DBG((be.dbg, LEVEL_2, "\tready set: %*n\n", pset_iterator, be.ready_set));
+ /* collect statistics about amount of ready nodes */
+ be_do_stat_sched_ready(block, be.cands);
- /* select a node to be scheduled and check if it was ready */
- irn = selector->select(env->selector_env, block_env, &info->list, be.curr_time, be.ready_set);
+ /* calculate the max delay of all candidates */
+ foreach_nodeset(be.cands, irn) {
+ sched_timestep_t d = get_irn_delay(&be, irn);
- DBG((be.dbg, LEVEL_3, "\tpicked node %+F\n", irn));
+ max_delay = d > max_delay ? d : max_delay;
+ }
+ mcands = new_nodeset(8);
+ ecands = new_nodeset(8);
+
+ /* calculate mcands and ecands */
+ foreach_nodeset(be.cands, irn) {
+ if (be_is_Keep(irn)) {
+ nodeset_break(be.cands);
+ break;
+ }
+ if (get_irn_delay(&be, irn) == max_delay) {
+ nodeset_insert(mcands, irn);
+ if (get_irn_etime(&be, irn) <= be.curr_time)
+ nodeset_insert(ecands, irn);
+ }
+ }
+
+ if (irn) {
+ /* Keeps must be immediately scheduled */
+ }
+ else {
+ DB((be.dbg, LEVEL_2, "\tbe.curr_time = %u\n", be.curr_time));
+
+ /* select a node to be scheduled and check if it was ready */
+ if (nodeset_count(mcands) == 1) {
+ DB((be.dbg, LEVEL_3, "\tmcand = 1, max_delay = %u\n", max_delay));
+ irn = nodeset_first(mcands);
+ }
+ else {
+ int cnt = nodeset_count(ecands);
+ if (cnt == 1) {
+ irn = nodeset_first(ecands);
+
+ if (arch_irn_class_is(env->arch_env, irn, branch)) {
+ /* BEWARE: don't select a JUMP if others are still possible */
+ goto force_mcands;
+ }
+ DB((be.dbg, LEVEL_3, "\tecand = 1, max_delay = %u\n", max_delay));
+ }
+ else if (cnt > 1) {
+ DB((be.dbg, LEVEL_3, "\tecand = %d, max_delay = %u\n", cnt, max_delay));
+ irn = select_node_heuristic(&be, ecands);
+ }
+ else {
+force_mcands:
+ DB((be.dbg, LEVEL_3, "\tmcand = %d\n", nodeset_count(mcands)));
+ irn = select_node_heuristic(&be, mcands);
+ }
+ }
+ }
+ del_nodeset(mcands);
+ del_nodeset(ecands);
+
+ DB((be.dbg, LEVEL_2, "\tpicked node %+F\n", irn));
+
+ /* Increase the time step. */
+ be.curr_time += exectime(env, irn);
/* Add the node to the schedule. */
add_to_sched(&be, irn);
- if(get_irn_mode(irn) == mode_T)
+ if (get_irn_mode(irn) == mode_T)
add_tuple_projs(&be, irn);
else
make_users_ready(&be, irn);
- /* Increase the time step. */
- be.curr_time += 1;
-
/* remove the scheduled node from the ready list. */
- if(pset_find_ptr(be.ready_set, irn))
- pset_remove_ptr(be.ready_set, irn);
+ if (nodeset_find(be.cands, irn))
+ nodeset_remove(be.cands, irn);
}
- if(selector->finish_block)
- selector->finish_block(env->selector_env, block_env, block);
+ if (selector->finish_block)
+ selector->finish_block(be.selector_block_env);
+
+ del_nodeset(be.cands);
+}
+
+static const list_sched_selector_t reg_pressure_selector_struct = {
+ reg_pressure_graph_init,
+ reg_pressure_block_init,
+ reg_pressure_select,
+ NULL, /* to_appear_in_schedule */
+ NULL, /* exectime */
+ NULL, /* latency */
+ reg_pressure_block_free,
+ free
+};
+
+const list_sched_selector_t *reg_pressure_selector = ®_pressure_selector_struct;
+
+/* List schedule a graph. */
+void list_sched(const be_irg_t *birg, int enable_mris)
+{
+ const arch_env_t *arch_env = birg->main_env->arch_env;
+ ir_graph *irg = birg->irg;
+
+ int num_nodes;
+ sched_env_t env;
+ mris_env_t *mris;
+
+ /* Assure, that the out edges are computed */
+ edges_assure(irg);
+
+ if(enable_mris)
+ mris = be_sched_mris_preprocess(birg);
+
+ num_nodes = get_irg_last_idx(irg);
+
+ memset(&env, 0, sizeof(env));
+ env.selector = arch_env->isa->impl->get_list_sched_selector(arch_env->isa);
+ env.arch_env = arch_env;
+ env.irg = irg;
+ env.sched_info = NEW_ARR_F(sched_irn_t, num_nodes);
+
+ memset(env.sched_info, 0, num_nodes * sizeof(*env.sched_info));
+
+ if (env.selector->init_graph)
+ env.selector_env = env.selector->init_graph(env.selector, arch_env, irg);
+
+ /* Schedule each single block. */
+ irg_block_walk_graph(irg, list_sched_block, NULL, &env);
+
+ if (env.selector->finish_graph)
+ env.selector->finish_graph(env.selector_env);
+
+ if(enable_mris)
+ be_sched_mris_free(mris);
- del_pset(be.ready_set);
- del_pset(be.already_scheduled);
+ DEL_ARR_F(env.sched_info);
}
projects / libfirm / blobdiff