/**
* Scheduling algorithms.
* Just a simple list scheduling algorithm is here.
- * @date 20.10.2004
+ * @date 20.10.2004
* @author Sebastian Hack
+ * @cvs-id $Id$
*/
#ifdef HAVE_CONFIG_H
#include <limits.h>
#include "benode_t.h"
+#include "be_t.h"
#include "obst.h"
#include "list.h"
#include "irmode_t.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 "beschedrss.h"
#include "bearch.h"
+#include "bestat.h"
+
+#ifdef WITH_LIBCORE
+#include <libcore/lc_opts.h>
+#include <libcore/lc_opts_enum.h>
+#endif /* WITH_LIBCORE */
+
+enum {
+ BE_SCHED_SELECT_TRIVIAL = 0,
+ BE_SCHED_SELECT_REGPRESS = 1,
+ BE_SCHED_SELECT_MUCHNIK = 2,
+ BE_SCHED_SELECT_HEUR = 3,
+ BE_SCHED_SELECT_HMUCHNIK = 4,
+ BE_SCHED_SELECT_RANDOM = 5
+};
+
+enum {
+ BE_SCHED_PREP_NONE = 0,
+ BE_SCHED_PREP_MRIS = 2,
+ BE_SCHED_PREP_RSS = 3
+};
-#define MAX(x,y) ((x) > (y) ? (x) : (y))
-#define MIN(x,y) ((x) < (y) ? (x) : (y))
+typedef struct _list_sched_options_t {
+ int select; /**< the node selector */
+ int prep; /**< schedule preparation */
+} list_sched_options_t;
+
+static list_sched_options_t list_sched_options = {
+ BE_SCHED_SELECT_HEUR, /* mueller heuristic selector */
+ BE_SCHED_PREP_NONE, /* no scheduling preparation */
+};
+
+#ifdef WITH_LIBCORE
+/* schedule selector options. */
+static const lc_opt_enum_int_items_t sched_select_items[] = {
+ { "trivial", BE_SCHED_SELECT_TRIVIAL },
+ { "random", BE_SCHED_SELECT_RANDOM },
+ { "regpress", BE_SCHED_SELECT_REGPRESS },
+ { "muchnik", BE_SCHED_SELECT_MUCHNIK },
+ { "heur", BE_SCHED_SELECT_HEUR },
+ { "hmuchnik", BE_SCHED_SELECT_HMUCHNIK },
+ { NULL, 0 }
+};
+
+/* schedule preparation options. */
+static const lc_opt_enum_int_items_t sched_prep_items[] = {
+ { "none", BE_SCHED_PREP_NONE },
+ { "mris", BE_SCHED_PREP_MRIS },
+ { "rss", BE_SCHED_PREP_RSS },
+ { NULL, 0 }
+};
+
+static lc_opt_enum_int_var_t sched_select_var = {
+ &list_sched_options.select, sched_select_items
+};
+
+static lc_opt_enum_int_var_t sched_prep_var = {
+ &list_sched_options.prep, sched_prep_items
+};
+
+static const lc_opt_table_entry_t list_sched_option_table[] = {
+ LC_OPT_ENT_ENUM_PTR("prep", "schedule preparation", &sched_prep_var),
+ LC_OPT_ENT_ENUM_PTR("select", "node selector", &sched_select_var),
+ { NULL }
+};
+#endif /* WITH_LIBCORE */
+
+/**
+ * All scheduling info needed per node.
+ */
+typedef struct _sched_irn_t {
+ unsigned num_not_sched_user; /**< The number of not yet scheduled users of this node */
+ unsigned already_sched : 1; /**< Set if this node is already scheduled */
+} sched_irn_t;
/**
* Scheduling environment for the whole graph.
*/
typedef struct _sched_env_t {
- const list_sched_selector_t *selector; /**< The node selector. */
- const arch_env_t *arch_env; /**< The architecture enviromnent. */
+ 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. */
+ void *selector_env; /**< A pointer to give to the selector. */
} sched_env_t;
-#if 0
-/*
- * Ugly global variable for the compare function
- * since qsort(3) does not pass an extra pointer.
+/**
+ * Environment for a block scheduler.
*/
-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
+typedef struct _block_sched_env_t {
+ sched_irn_t *sched_info; /**< scheduling info per node, copied from the global scheduler object */
+ nodeset *cands; /**< the set of candidates */
+ ir_node *block; /**< the current block */
+ sched_env_t *sched_env; /**< the scheduler environment */
+ nodeset *live; /**< simple liveness during scheduling */
+ const list_sched_selector_t *selector;
+ void *selector_block_env;
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
+} block_sched_env_t;
-static ir_node *trivial_select(void *block_env, pset *ready_set)
+/**
+ * Returns non-zero if the node is already scheduled
+ */
+static INLINE int is_already_scheduled(block_sched_env_t *env, ir_node *n)
{
- const arch_env_t *arch_env = block_env;
- ir_node *irn = NULL;
-
- for(irn = pset_first(ready_set); irn; irn = pset_next(ready_set)) {
- if(arch_irn_classify(arch_env, irn) != arch_irn_class_branch) {
- pset_break(ready_set);
- return irn;
- }
- }
+ int idx = get_irn_idx(n);
- irn = pset_first(ready_set);
- pset_break(ready_set);
-
- return irn;
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].already_sched;
}
-static void *trivial_init_graph(const list_sched_selector_t *vtab, const arch_env_t *arch_env, ir_graph *irg)
+/**
+ * Mark a node as already scheduled
+ */
+static INLINE void mark_already_scheduled(block_sched_env_t *env, ir_node *n)
{
- return (void *) arch_env;
-}
+ int idx = get_irn_idx(n);
-static void *trivial_init_block(void *graph_env, ir_node *bl)
-{
- return graph_env;
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].already_sched = 1;
}
-static INLINE int must_appear_in_schedule(const list_sched_selector_t *sel, void *block_env, const ir_node *irn)
+/**
+ * Try to put a node in the ready set.
+ * @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 *pred, ir_node *irn)
{
- int res = 0;
-
- if(sel->to_appear_in_schedule)
- res = sel->to_appear_in_schedule(block_env, irn);
-
- return res || to_appear_in_schedule(irn) || be_is_Keep(irn) || be_is_RegParams(irn);
-}
+ int i, n;
-static const list_sched_selector_t trivial_selector_struct = {
- trivial_init_graph,
- trivial_init_block,
- trivial_select,
- NULL,
- NULL,
- NULL
-};
+ /* Blocks cannot be scheduled. */
+ if (is_Block(irn) || get_irn_n_edges(irn) == 0)
+ return 0;
-const list_sched_selector_t *trivial_selector = &trivial_selector_struct;
+ /*
+ * 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))
+ return 0;
-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;
- pset *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);
- }
+ for (i = 0, n = get_irn_ins_or_deps(irn); i < n; ++i) {
+ ir_node *op = get_irn_in_or_dep(irn, i);
- return us;
-}
+ /* 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;
+ }
-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;
-}
+ /* If the operand is local to the scheduled block and not yet
+ * scheduled, this nodes cannot be made ready, so exit. */
+ if (! is_already_scheduled(env, op) && get_nodes_block(op) == env->block)
+ return 0;
+ }
-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;
+ nodeset_insert(env->cands, irn);
- /*
- * If the node is in the current block but not
- * yet scheduled, we keep on searching from that node.
- */
- if(!pset_find_ptr(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);
- }
- }
+ /* Notify selector about the ready node. */
+ if (env->selector->node_ready)
+ env->selector->node_ready(env->selector_block_env, irn, pred);
- return res;
- }
+ DB((env->dbg, LEVEL_2, "\tmaking ready: %+F\n", irn));
- /*
- * 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;
+ return 1;
}
-static int compute_max_hops(reg_pressure_selector_env_t *env, ir_node *irn)
+/**
+ * Try, to make all users of a node ready.
+ * In fact, a usage node can only be made ready, if all its operands
+ * have already been scheduled yet. This is checked my make_ready().
+ * @param env The block schedule environment.
+ * @param irn The node, which usages (successors) are to be made ready.
+ */
+static INLINE void make_users_ready(block_sched_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);
+ ir_node *user = get_edge_src_irn(edge);
+ if (! is_Phi(user))
+ make_ready(env, irn, user);
}
- 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 = pset_new_ptr(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(is_live_end(bl, op))
- us->uses_in_block = 99999;
- else
- us->uses_in_block++;
- }
- }
- }
+ foreach_out_edge_kind(irn, edge, EDGE_KIND_DEP) {
+ ir_node *user = get_edge_src_irn(edge);
+ if (! is_Phi(user))
+ make_ready(env, irn, user);
}
-
- return env;
}
-static void reg_pressure_block_free(void *block_env)
-{
- reg_pressure_selector_env_t *env = block_env;
- usage_stats_t *us;
-
- for(us = env->root; us; us = us->next)
- set_irn_link(us->irn, NULL);
+/**
+ * Returns the number of not yet schedules users.
+ */
+static INLINE int get_irn_not_sched_user(block_sched_env_t *env, ir_node *n) {
+ int idx = get_irn_idx(n);
- obstack_free(&env->obst, NULL);
- del_pset(env->already_scheduled);
- free(env);
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].num_not_sched_user;
}
-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));
- }
-
- else if(mode_is_data(get_irn_mode(irn)))
- res = compute_max_hops(env, irn);
-
+/**
+ * Sets the number of not yet schedules users.
+ */
+static INLINE void set_irn_not_sched_user(block_sched_env_t *env, ir_node *n, int num) {
+ int idx = get_irn_idx(n);
- return res;
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].num_not_sched_user = num;
}
-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);
+/**
+ * Add @p num to the number of not yet schedules users and returns the result.
+ */
+static INLINE int add_irn_not_sched_user(block_sched_env_t *env, ir_node *n, int num) {
+ int idx = get_irn_idx(n);
- if(must_appear_in_schedule(env->main_env->vtab, env, op))
- sum += compute_max_hops(env, op);
- }
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].num_not_sched_user += num;
+ return env->sched_info[idx].num_not_sched_user;
+}
- sum += get_result_hops_sum(env, irn);
+/**
+ * Returns the number of users of a node having mode datab.
+ */
+static int get_num_successors(ir_node *irn) {
+ int sum = 0;
+ const ir_edge_t *edge;
- return sum;
-}
+ if (get_irn_mode(irn) == mode_T) {
+ /* for mode_T nodes: count the users of all Projs */
+ foreach_out_edge(irn, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ ir_mode *mode = get_irn_mode(proj);
-static ir_node *reg_pressure_select(void *block_env, pset *ready_set)
-{
- reg_pressure_selector_env_t *env = block_env;
- ir_node *irn, *res = NULL;
- int curr_cost = INT_MAX;
-
- assert(pset_count(ready_set) > 0);
-
- for(irn = pset_first(ready_set); irn; irn = pset_next(ready_set)) {
- /*
- Ignore branch instructions for the time being.
- They should only be scheduled if there is nothing else.
- */
- if(arch_irn_classify(env->main_env->arch_env, irn) != arch_irn_class_branch) {
- int costs = reg_pr_costs(env, irn);
- if(costs <= curr_cost) {
- res = irn;
- curr_cost = costs;
- }
+ if (mode == mode_T)
+ sum += get_num_successors(proj);
+ else if (mode_is_datab(mode))
+ sum += get_irn_n_edges(proj);
}
}
-
- /*
- There was no result so we only saw a branch.
- Take it and finish.
- */
-
- if(!res) {
- res = pset_first(ready_set);
- pset_break(ready_set);
-
- assert(res && "There must be a node scheduled.");
+ else {
+ /* do not count keep-alive edges */
+ foreach_out_edge(irn, edge) {
+ if (get_irn_opcode(get_edge_src_irn(edge)) != iro_End)
+ sum++;
+ }
}
- pset_insert_ptr(env->already_scheduled, res);
- return res;
-}
-
-static const list_sched_selector_t reg_pressure_selector_struct = {
- reg_pressure_graph_init,
- reg_pressure_block_init,
- reg_pressure_select,
- NULL,
- reg_pressure_block_free,
- free
-};
-
-const list_sched_selector_t *reg_pressure_selector = ®_pressure_selector_struct;
-
-static void list_sched_block(ir_node *block, void *env_ptr);
-
-void list_sched(const arch_env_t *arch_env, ir_graph *irg)
-{
- sched_env_t env;
-
- 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;
-
- if(env.selector->init_graph)
- env.selector_env = env.selector->init_graph(env.selector, arch_env, irg);
-
- /* Assure, that the out edges are computed */
- edges_assure(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);
+ return sum;
}
-
/**
- * Environment for a block scheduler.
- */
-typedef struct _block_sched_env_t {
- int curr_time;
- pset *ready_set;
- pset *already_scheduled;
- ir_node *block;
- const list_sched_selector_t *selector;
- void *selector_block_env;
- DEBUG_ONLY(firm_dbg_module_t *dbg;)
-} block_sched_env_t;
-
-/**
- * Try to put a node in the ready set.
- * @param env The block scheduler environment.
- * @param irn The node to make ready.
- * @return 1, if the node could be made ready, 0 else.
+ * Adds irn to @p live, updates all inputs that this user is scheduled
+ * and counts all of it's non scheduled users.
*/
-static INLINE int make_ready(block_sched_env_t *env, ir_node *irn)
-{
- int i, n;
+static void update_sched_liveness(block_sched_env_t *env, ir_node *irn) {
+ int i;
- /* Blocks cannot be scheduled. */
- if(is_Block(irn))
- return 0;
+ /* ignore Projs */
+ if (is_Proj(irn))
+ return;
- /*
- * 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))
- return 0;
+ for (i = get_irn_ins_or_deps(irn) - 1; i >= 0; --i) {
+ ir_node *in = get_irn_in_or_dep(irn, i);
- for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
- ir_node *op = get_irn_n(irn, i);
+ /* if in is a proj: update predecessor */
+ while (is_Proj(in))
+ in = get_Proj_pred(in);
- /* 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)
- return 0;
- }
-
- DBG((env->dbg, LEVEL_2, "\tmaking ready: %+F\n", irn));
- pset_insert_ptr(env->ready_set, irn);
+ /* if in is still in the live set: reduce number of users by one */
+ if (nodeset_find(env->live, in)) {
+ if (add_irn_not_sched_user(env, in, -1) <= 0)
+ nodeset_remove(env->live, in);
+ }
+ }
- return 1;
+ /*
+ get_num_successors returns the number of all users. This includes
+ users in different blocks as well. As the each block is scheduled separately
+ the liveness info of those users will not be updated and so these
+ users will keep up the register pressure as it is desired.
+ */
+ i = get_num_successors(irn);
+ if (i > 0) {
+ set_irn_not_sched_user(env, irn, i);
+ nodeset_insert(env->live, irn);
+ }
}
-/**
- * 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)
-
-/**
- * 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)
-
-/**
- * Try, to make all users of a node ready.
- * In fact, a usage node can only be made ready, if all its operands
- * have already been scheduled yet. This is checked my make_ready().
- * @param env The block schedule environment.
- * @param irn The node, which usages (successors) are to be made ready.
- */
-static INLINE void make_users_ready(block_sched_env_t *env, ir_node *irn)
+static INLINE int must_appear_in_schedule(const list_sched_selector_t *sel, void *block_env, const ir_node *irn)
{
- const ir_edge_t *edge;
+ int res = -1;
- foreach_out_edge(irn, edge) {
- ir_node *user = edge->src;
- if(!is_Phi(user))
- make_ready(env, user);
- }
-}
+ if(sel->to_appear_in_schedule)
+ res = sel->to_appear_in_schedule(block_env, irn);
-/**
- * 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;
+ return res >= 0 ? res : (to_appear_in_schedule(irn) || be_is_Keep(irn) || be_is_CopyKeep(irn) || be_is_RegParams(irn));
}
/**
{
/* If the node consumes/produces data, it is appended to the schedule
* list, otherwise, it is not put into the list */
- if(must_appear_in_schedule(env->selector, env->selector_block_env, 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;
+ update_sched_liveness(env, irn);
sched_add_before(env->block, irn);
DBG((env->dbg, LEVEL_2, "\tadding %+F\n", irn));
}
+ /* notify the selector about the finally selected node. */
+ if (env->selector->node_selected)
+ env->selector->node_selected(env->selector_block_env, irn);
+
/* 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;
}
* 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)
{
assert(get_irn_mode(irn) == mode_T && "Mode of node must be tuple");
+ if(is_Bad(irn))
+ return;
+
+
+ /* non-proj nodes can have dependency edges to tuple nodes. */
+ foreach_out_edge_kind(irn, edge, EDGE_KIND_DEP) {
+ ir_node *out = get_edge_src_irn(edge);
+ make_ready(env, irn, out);
+ }
+
+ /* schedule the normal projs */
foreach_out_edge(irn, edge) {
- ir_node *out = edge->src;
+ ir_node *out = get_edge_src_irn(edge);
assert(is_Proj(out) && "successor of a modeT node must be a proj");
- if(get_irn_mode(out) == mode_T)
+ if (get_irn_mode(out) == mode_T)
add_tuple_projs(env, out);
else {
add_to_sched(env, out);
}
}
-static ir_node *select_node(block_sched_env_t *be)
-{
- ir_node *irn;
-
- for(irn = pset_first(be->ready_set); irn; irn = pset_next(be->ready_set)) {
- if(be_is_Keep(irn)) {
- pset_break(be->ready_set);
- return irn;
- }
- }
-
- return be->selector->select(be->selector_block_env, be->ready_set);
-}
-
/**
* Perform list scheduling on a block.
*
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));
- int phi_seen = 0;
sched_info_t *info = get_irn_sched_info(block);
block_sched_env_t be;
INIT_LIST_HEAD(&info->list);
/* Initialize the block scheduling environment */
- be.block = block;
- be.curr_time = 0;
- be.ready_set = new_pset(node_cmp_func, get_irn_n_edges(block));
- be.already_scheduled = new_pset(node_cmp_func, get_irn_n_edges(block));
- be.selector = selector;
+ be.sched_info = env->sched_info;
+ be.block = block;
+ be.cands = new_nodeset(get_irn_n_edges(block));
+ be.live = new_nodeset(get_irn_n_edges(block));
+ be.selector = selector;
+ be.sched_env = env;
FIRM_DBG_REGISTER(be.dbg, "firm.be.sched");
- if(selector->init_block)
- be.selector_block_env = selector->init_block(env->selector_env, block);
-
DBG((be.dbg, LEVEL_1, "scheduling %+F\n", block));
+ if (selector->init_block)
+ be.selector_block_env = selector->init_block(env->selector_env, block);
+
/* Then one can add all nodes are ready to the set. */
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;
+
+ if (get_irn_n_edges(irn) == 0)
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.
+ */
add_to_sched(&be, irn);
make_users_ready(&be, irn);
- phi_seen = 1;
}
-
- /* The start block will be scheduled as the first node */
- else if(irn == start_node) {
+ else if (irn == start_node) {
+ /* The start block will be scheduled as the first node */
add_to_sched(&be, irn);
add_tuple_projs(&be, irn);
}
-
-
- /* Other nodes must have all operands in other blocks to be made
- * ready */
else {
+ /* 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) {
- ir_node *operand = get_irn_n(irn, j);
+ for (j = 0, m = get_irn_ins_or_deps(irn); j < m; ++j) {
+ ir_node *operand = get_irn_in_or_dep(irn, j);
- if(get_nodes_block(operand) == block) {
+ if (get_nodes_block(operand) == block) {
ready = 0;
break;
}
+ else {
+ /* live in values increase register pressure */
+ update_sched_liveness(&be, operand);
+ }
}
/* 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;
+ /* Iterate over all remaining nodes */
+ while (nodeset_count(be.cands) > 0) {
+ /* collect statistics about amount of ready nodes */
+ be_do_stat_sched_ready(block, be.cands);
- while(pset_count(be.ready_set) > 0) {
- /* select a node to be scheduled and check if it was ready */
- irn = select_node(&be);
+ /* Keeps must be scheduled immediatly */
+ foreach_nodeset(be.cands, irn) {
+ if (be_is_Keep(irn) || be_is_CopyKeep(irn) || get_irn_mode(irn) == mode_M) {
+ nodeset_break(be.cands);
+ break;
+ }
+ }
- DBG((be.dbg, LEVEL_3, "\tpicked node %+F\n", irn));
+ if (! irn) {
+ /* Keeps must be immediately scheduled */
+ irn = be.selector->select(be.selector_block_env, be.cands, be.live);
+ }
+
+ DB((be.dbg, LEVEL_2, "\tpicked node %+F\n", 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)
+ if (selector->finish_block)
selector->finish_block(be.selector_block_env);
- del_pset(be.ready_set);
- del_pset(be.already_scheduled);
+ del_nodeset(be.cands);
+ del_nodeset(be.live);
+}
+
+/* List schedule a graph. */
+void list_sched(const be_irg_t *birg, be_options_t *be_opts)
+{
+ 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 = NULL;
+ list_sched_selector_t sel;
+
+ /* Select a scheduler based on backend options */
+ switch (list_sched_options.select) {
+ case BE_SCHED_SELECT_TRIVIAL:
+ memcpy(&sel, trivial_selector, sizeof(sel));
+ break;
+ case BE_SCHED_SELECT_RANDOM:
+ memcpy(&sel, random_selector, sizeof(sel));
+ break;
+ case BE_SCHED_SELECT_REGPRESS:
+ memcpy(&sel, reg_pressure_selector, sizeof(sel));
+ break;
+ case BE_SCHED_SELECT_MUCHNIK:
+ memcpy(&sel, muchnik_selector, sizeof(sel));
+ break;
+ case BE_SCHED_SELECT_HEUR:
+ memcpy(&sel, heuristic_selector, sizeof(sel));
+ break;
+ case BE_SCHED_SELECT_HMUCHNIK:
+ default:
+ memcpy(&sel, trivial_selector, sizeof(sel));
+ }
+
+ /* Assure, that the out edges are computed */
+ edges_deactivate(birg->irg);
+ edges_activate(birg->irg);
+
+ switch (list_sched_options.prep) {
+ case BE_SCHED_PREP_MRIS:
+ mris = be_sched_mris_preprocess(birg);
+ break;
+ case BE_SCHED_PREP_RSS:
+ rss_schedule_preparation(birg);
+ break;
+ default:
+ break;
+ }
+
+ num_nodes = get_irg_last_idx(irg);
+
+ /* initialize environment for list scheduler */
+ memset(&env, 0, sizeof(env));
+ env.selector = arch_env->isa->impl->get_list_sched_selector(arch_env->isa, &sel);
+ 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[0]));
+
+ 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 (list_sched_options.prep == BE_SCHED_PREP_MRIS)
+ be_sched_mris_free(mris);
+
+ DEL_ARR_F(env.sched_info);
+}
+
+#ifdef WITH_LIBCORE
+/**
+ * Register list scheduler options.
+ */
+void list_sched_register_options(lc_opt_entry_t *grp) {
+ static int run_once = 0;
+ lc_opt_entry_t *sched_grp;
+
+ if (! run_once) {
+ run_once = 1;
+ sched_grp = lc_opt_get_grp(grp, "sched");
+
+ lc_opt_add_table(sched_grp, list_sched_option_table);
+ rss_register_options(sched_grp);
+ }
}
+#endif /* WITH_LIBCORE */