/**
* 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 "config.h"
#endif
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
+#include <limits.h>
+
+#include "benode_t.h"
+#include "be_t.h"
-#include "fourcc.h"
#include "obst.h"
#include "list.h"
#include "iterator.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 "firm/bearch_firm.h"
+#include "beschedmris.h"
+#include "bearch.h"
+#include "bestat.h"
+/**
+ * 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 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;
-#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;
+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 int cmp_usage(const void *a, const void *b)
+/**
+ * Returns non-zero if the node is already scheduled
+ */
+static INLINE int is_already_scheduled(block_sched_env_t *env, ir_node *n)
{
- 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;
+ int idx = get_irn_idx(n);
-
- return res;
+ assert(idx < ARR_LEN(env->sched_info));
+ return env->sched_info[idx].already_sched;
}
-#endif
-static ir_node *trivial_select(void *env, void *block_env,
- const struct list_head *sched_head,
- int curr_time, pset *ready_set)
+/**
+ * Mark a node as already scheduled
+ */
+static INLINE void mark_already_scheduled(block_sched_env_t *env, ir_node *n)
{
- ir_node *res;
+ int idx = get_irn_idx(n);
-#if 0
- int i, n = pset_count(ready_set);
- ir_node *irn;
- ir_node **ready = alloca(n * sizeof(ready[0]));
-
- for(irn = pset_first(ready_set); irn; irn = pset_next(ready_set))
- ready[i++] = irn;
-#endif
-
- res = pset_first(ready_set);
- pset_break(ready_set);
- return res;
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].already_sched = 1;
}
-static const list_sched_selector_t trivial_selector_struct = {
- NULL,
- NULL,
- trivial_select,
- NULL,
- NULL
-};
-
-const list_sched_selector_t *trivial_selector = &trivial_selector_struct;
-
-static void list_sched_block(ir_node *block, void *env_ptr);
-
-void list_sched(const struct _arch_isa_t *isa, ir_graph *irg)
-{
- sched_env_t env;
- const list_sched_selector_t *selector;
-
- memset(&env, 0, sizeof(env));
- selector = env.selector = isa->impl->get_list_sched_selector(isa);
- env.selector_env = selector->init_graph ? selector->init_graph(isa, irg) : NULL;
- env.irg = 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(selector->finish_graph)
- selector->finish_graph(env.selector_env, irg);
-}
-
-
-/**
- * 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;
-} 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.
+ * @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;
+ int i, n;
/* 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) {
- ir_node *op = get_irn_n(irn, i);
+ for (i = 0, n = get_irn_ins_or_deps(irn); i < n; ++i) {
+ ir_node *op = get_irn_in_or_dep(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;
-}
+ /* Notify selector about the ready node. */
+ if (env->selector->node_ready)
+ env->selector->node_ready(env->selector_block_env, irn, pred);
-/**
- * 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)
+ DB((env->dbg, LEVEL_2, "\tmaking ready: %+F\n", irn));
-/**
- * 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)
+ return 1;
+}
/**
* Try, to make all users of a node ready.
const ir_edge_t *edge;
foreach_out_edge(irn, edge) {
- ir_node *user = edge->src;
- if(!is_Phi(user))
- make_ready(env, user);
+ ir_node *user = get_edge_src_irn(edge);
+ if (! is_Phi(user))
+ make_ready(env, irn, user);
+ }
+
+ 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);
}
}
/**
- * Compare to nodes using pointer equality.
- * @param p1 Node one.
- * @param p2 Node two.
- * @return 0 if they are identical.
+ * Returns the number of not yet schedules users.
*/
-static int node_cmp_func(const void *p1, const void *p2)
+static INLINE int get_irn_not_sched_user(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].num_not_sched_user;
+}
+
+/**
+ * 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);
+
+ assert(idx < ARR_LEN(env->sched_info));
+ env->sched_info[idx].num_not_sched_user = num;
+}
+
+/**
+ * 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);
+
+ 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;
+}
+
+/**
+ * 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;
+
+ 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);
+
+ if (mode == mode_T)
+ sum += get_num_successors(proj);
+ else if (mode_is_datab(mode))
+ sum += get_irn_n_edges(proj);
+ }
+ }
+ else {
+ /* do not count keep-alive edges */
+ foreach_out_edge(irn, edge) {
+ if (get_irn_opcode(get_edge_src_irn(edge)) != iro_End)
+ sum++;
+ }
+ }
+
+ return sum;
+}
+
+/**
+ * Adds irn to @p live, updates all inputs that this user is scheduled
+ * and counts all of it's non scheduled users.
+ */
+static void update_sched_liveness(block_sched_env_t *env, ir_node *irn) {
+ int i;
+
+ /* ignore Projs */
+ if (is_Proj(irn))
+ return;
+
+ for (i = get_irn_ins_or_deps(irn) - 1; i >= 0; --i) {
+ ir_node *in = get_irn_in_or_dep(irn, i);
+
+ /* if in is a proj: update predecessor */
+ while (is_Proj(in))
+ in = get_Proj_pred(in);
+
+ /* 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);
+ }
+ }
+
+ /*
+ 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);
+ }
+}
+
+static INLINE int must_appear_in_schedule(const list_sched_selector_t *sel, void *block_env, const ir_node *irn)
{
- return p1 != p2;
+ 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_CopyKeep(irn) || be_is_RegParams(irn));
}
/**
* 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;
+ 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;
}
-
/**
* 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)
{
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);
* 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 j, m;
- int phi_seen = 0;
- sched_info_t *info = get_irn_sched_info(block);
/* 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_edges(block));
- be.already_scheduled = new_pset(node_cmp_func, get_irn_n_edges(block));
-
- firm_dbg_set_mask(be.dbg, 0);
-
- if(selector->init_block)
- block_env = selector->init_block(env->selector_env, block);
+ 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");
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;
- /* 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;
}
-
- /* Other nodes must have all operands in other blocks to be made
- * ready */
+ 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);
+ }
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) {
- // DBG((be.dbg, LEVEL_2, "\tready set: %*n\n", pset_iterator, be.ready_set));
+ /* Keeps must be scheduled immediatly */
+ foreach_nodeset(be.cands, irn) {
+ if (be_is_Keep(irn) || be_is_CopyKeep(irn)) {
+ nodeset_break(be.cands);
+ break;
+ }
+ }
- /* 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);
+ if (! irn) {
+ /* Keeps must be immediately scheduled */
+ irn = be.selector->select(be.selector_block_env, be.cands, be.live);
+ }
- DBG((be.dbg, LEVEL_3, "\tpicked node %+F\n", irn));
+ 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)
- selector->finish_block(env->selector_env, block_env, block);
+ if (selector->finish_block)
+ selector->finish_block(be.selector_block_env);
+
+ 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 (be_opts->sched_select) {
+ case BE_SCHED_SELECT_TRIVIAL:
+ memcpy(&sel, trivial_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_assure(irg);
+
+ if (be_opts->mris)
+ mris = be_sched_mris_preprocess(birg);
+
+ 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 (be_opts->mris)
+ be_sched_mris_free(mris);
- del_pset(be.ready_set);
- del_pset(be.already_scheduled);
+ DEL_ARR_F(env.sched_info);
}