* @brief Primitive list scheduling with different node selectors.
* @author Sebastian Hack
* @date 20.10.2004
- * @version $Id$
*/
#include "config.h"
#include <stdarg.h>
#include <string.h>
#include <limits.h>
+#include <stdbool.h>
#include "benode.h"
#include "be_t.h"
#include "obst.h"
#include "list.h"
-#include "iterator.h"
#include "iredges_t.h"
#include "irgwalk.h"
#include "belistsched.h"
#include "bearch.h"
#include "bestat.h"
-#include "beirg.h"
#include "lc_opts.h"
#include "lc_opts_enum.h"
-DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL);
-
-/**
- * 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;
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
/**
* Scheduling environment for the whole graph.
*/
typedef struct sched_env_t {
- sched_irn_t *sched_info; /**< scheduling info per node */
- const list_sched_selector_t *selector; /**< The node selector. */
- void *selector_env; /**< A pointer to give to the selector. */
+ unsigned *scheduled; /**< bitset of already scheduled nodes */
+ const list_sched_selector_t *selector; /**< The node selector. */
+ void *selector_env; /**< A pointer to give to the selector. */
} sched_env_t;
/**
* Environment for a block scheduler.
*/
typedef struct block_sched_env_t {
- sched_irn_t *sched_info; /**< scheduling info per node, copied from the global scheduler object */
- ir_nodeset_t cands; /**< the set of candidates */
- ir_node *block; /**< the current block */
- sched_env_t *sched_env; /**< the scheduler environment */
- ir_nodeset_t live; /**< simple liveness during scheduling */
+ /** scheduling info per node, copied from the global scheduler object */
+ unsigned *scheduled;
+ /** the set of candidates */
+ ir_nodeset_t cands;
+ ir_node *block; /**< the current block */
+ sched_env_t *sched_env; /**< the scheduler environment */
const list_sched_selector_t *selector;
- void *selector_block_env;
+ void *selector_block_env;
} 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)
+static bool is_already_scheduled(const sched_env_t *env, ir_node *n)
{
- unsigned const idx = get_irn_idx(n);
-
- assert(idx < ARR_LEN(env->sched_info));
- return env->sched_info[idx].already_sched;
+ unsigned idx = get_irn_idx(n);
+ return rbitset_is_set(env->scheduled, idx);
}
/**
* Mark a node as already scheduled
*/
-static inline void set_already_scheduled(block_sched_env_t *env, ir_node *n)
+static void set_already_scheduled(sched_env_t *env, ir_node *n)
{
- unsigned const idx = get_irn_idx(n);
-
- assert(idx < ARR_LEN(env->sched_info));
- env->sched_info[idx].already_sched = 1;
+ unsigned idx = get_irn_idx(n);
+ rbitset_set(env->scheduled, idx);
}
static void selected(block_sched_env_t *env, ir_node *irn);
+static void add_to_sched(block_sched_env_t *env, 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.
+ * Put a node in the ready set, or make it available immediately if it doesn't
+ * need to be scheduled
*/
-static inline int make_ready(block_sched_env_t *env, ir_node *pred, ir_node *irn)
+static void node_ready(block_sched_env_t *env, ir_node *pred, ir_node *irn)
{
- int i, n;
-
- /* Blocks cannot be scheduled. */
- if (is_Block(irn) || get_irn_n_edges(irn) == 0)
- 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))
- return 0;
-
- 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(is_End(irn));
- continue;
- }
-
- /* 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;
- }
-
- if (is_Proj(irn) || (arch_irn_get_flags(irn) & arch_irn_flags_not_scheduled)) {
+ if (is_Proj(irn)
+ || (arch_get_irn_flags(irn) & arch_irn_flags_not_scheduled)) {
selected(env, irn);
DB((dbg, LEVEL_3, "\tmaking immediately available: %+F\n", irn));
+ } else if (be_is_Keep(irn) || be_is_CopyKeep(irn)) {
+ /* Keeps must be scheduled immediately */
+ add_to_sched(env, irn);
} else {
ir_nodeset_insert(&env->cands, irn);
DB((dbg, LEVEL_2, "\tmaking ready: %+F\n", irn));
}
-
- return 1;
}
/**
- * 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 by make_ready().
- * @param env The block schedule environment.
- * @param irn The node, which usages (successors) are to be made ready.
- */
-static void make_users_ready(block_sched_env_t *env, ir_node *irn)
-{
- const ir_edge_t *edge;
-
- /* make all data users ready */
- foreach_out_edge(irn, edge) {
- ir_node *user = get_edge_src_irn(edge);
-
- if (! is_Phi(user))
- make_ready(env, irn, user);
- }
-
- /* and the dependent nodes as well */
- 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);
- }
-}
-
-/**
- * Returns the number of not yet schedules users.
- */
-static inline int get_irn_not_sched_user(block_sched_env_t *env, ir_node *n)
-{
- unsigned const 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)
-{
- unsigned const 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)
-{
- unsigned const 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 its non scheduled users.
+ * 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 void update_sched_liveness(block_sched_env_t *env, ir_node *irn)
+static void try_make_ready(block_sched_env_t *env, ir_node *pred, ir_node *irn)
{
- int i;
+ int i, n;
- /* ignore Projs */
- if (is_Proj(irn))
+ /* we schedule one block at a time, so no need to consider users in other
+ * blocks */
+ if (is_Block(irn) || get_nodes_block(irn) != env->block)
return;
+ if (is_Phi(irn) || is_End(irn))
+ return;
+ /* check if all operands are already available */
+ n = get_irn_ins_or_deps(irn);
+ for (i = 0; i < n; ++i) {
+ ir_node *op = get_irn_in_or_dep(irn, i);
- 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 */
- in = skip_Proj(in);
-
- /* if in is still in the live set: reduce number of users by one */
- if (ir_nodeset_contains(&env->live, in)) {
- if (add_irn_not_sched_user(env, in, -1) <= 0)
- ir_nodeset_remove(&env->live, in);
- }
+ /* If the operand is local to the scheduled block and not yet
+ * scheduled, this nodes cannot be made ready, so exit. */
+ if (get_nodes_block(op) == env->block
+ && !is_already_scheduled(env->sched_env, op))
+ return;
}
- /*
- 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);
- ir_nodeset_insert(&env->live, irn);
- }
+ node_ready(env, pred, irn);
}
static void selected(block_sched_env_t *env, ir_node *node)
env->selector->node_selected(env->selector_block_env, node);
/* Insert the node in the set of all available scheduled nodes. */
- set_already_scheduled(env, node);
+ set_already_scheduled(env->sched_env, node);
- make_users_ready(env, node);
+ /* check users, they might be ready now */
+ foreach_out_edge(node, edge) {
+ ir_node *user = get_edge_src_irn(edge);
+ try_make_ready(env, node, user);
+ }
+ foreach_out_edge_kind(node, edge, EDGE_KIND_DEP) {
+ ir_node *user = get_edge_src_irn(edge);
+ try_make_ready(env, node, user);
+ }
}
/**
*/
static void add_to_sched(block_sched_env_t *env, ir_node *irn)
{
- assert(! (arch_irn_get_flags(irn) & arch_irn_flags_not_scheduled));
+ assert(! (arch_get_irn_flags(irn) & arch_irn_flags_not_scheduled));
- update_sched_liveness(env, irn);
sched_add_before(env->block, irn);
- DBG((dbg, LEVEL_2, "\tadding %+F\n", irn));
+ DB((dbg, LEVEL_2, "\tschedule %+F\n", irn));
/* Remove the node from the ready set */
ir_nodeset_remove(&env->cands, irn);
const list_sched_selector_t *selector = env->selector;
block_sched_env_t be;
- const ir_edge_t *edge;
- ir_node *irn;
- int j, m;
+ ir_nodeset_t *cands = &be.cands;
/* Initialize the block's list head that will hold the schedule. */
sched_init_block(block);
/* Initialize the block scheduling environment */
- be.sched_info = env->sched_info;
- be.block = block;
- ir_nodeset_init_size(&be.cands, get_irn_n_edges(block));
- ir_nodeset_init_size(&be.live, get_irn_n_edges(block));
- be.selector = selector;
- be.sched_env = env;
+ be.block = block;
+ be.selector = selector;
+ be.sched_env = env;
+ ir_nodeset_init_size(cands, get_irn_n_edges(block));
- DBG((dbg, LEVEL_1, "scheduling %+F\n", block));
+ DB((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);
- unsigned code = get_irn_opcode(irn);
- int users;
-
- if (code == iro_End) {
- /* Skip the end node because of keep-alive edges. */
- continue;
- }
-
- users = get_irn_n_edges(irn);
- if (users == 0) {
- continue;
- } else if (users == 1) {
- /* ignore nodes that are only hold by the anchor */
- const ir_edge_t *edge = get_irn_out_edge_first_kind(irn, EDGE_KIND_NORMAL);
- ir_node *user = get_edge_src_irn(edge);
- if (is_Anchor(user))
- continue;
- }
+ ir_node *irn = get_edge_src_irn(edge);
if (is_Phi(irn)) {
/* Phi functions are scheduled immediately, since they only
/* The start block will be scheduled as the first node */
add_to_sched(&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_ins_or_deps(irn); j < m; ++j) {
- ir_node *operand = get_irn_in_or_dep(irn, j);
-
- if (get_nodes_block(operand) == block) {
- ready = 0;
- break;
- } else {
- /* live in values increase register pressure */
- ir_nodeset_insert(&be.live, operand);
- }
- }
-
- /* Make the node ready, if all operands live in a foreign block */
- if (ready) {
- DBG((dbg, LEVEL_2, "\timmediately ready: %+F\n", irn));
- make_ready(&be, NULL, irn);
- }
+ try_make_ready(&be, NULL, irn);
}
}
/* Iterate over all remaining nodes */
- while (ir_nodeset_size(&be.cands) > 0) {
- ir_nodeset_iterator_t iter;
-
- /* Keeps must be scheduled immediately */
- foreach_ir_nodeset(&be.cands, irn, iter) {
- if (be_is_Keep(irn) || be_is_CopyKeep(irn) || is_Sync(irn)) {
- break;
- }
- }
-
- if (irn == NULL) {
- irn = be.selector->select(be.selector_block_env, &be.cands, &be.live);
- }
-
+ while (ir_nodeset_size(cands) > 0) {
+ ir_node *irn = be.selector->select(be.selector_block_env, cands);
DB((dbg, LEVEL_2, "\tpicked node %+F\n", irn));
+ /* remove the scheduled node from the ready list. */
+ ir_nodeset_remove(cands, irn);
/* Add the node to the schedule. */
add_to_sched(&be, irn);
-
- /* remove the scheduled node from the ready list. */
- ir_nodeset_remove(&be.cands, irn);
}
+ ir_nodeset_destroy(cands);
+
if (selector->finish_block)
selector->finish_block(be.selector_block_env);
-
- ir_nodeset_destroy(&be.cands);
- ir_nodeset_destroy(&be.live);
}
/* List schedule a graph. */
int num_nodes;
sched_env_t env;
-#if 1
/* Matze: This is very slow, we should avoid it to improve backend speed,
* we just have to make sure that we have no dangling out-edges at this
* point...
*/
-
- /* Assure, that we have no dangling out-edges to deleted stuff */
edges_deactivate(irg);
edges_activate(irg);
-#endif
num_nodes = get_irg_last_idx(irg);
/* initialize environment for list scheduler */
memset(&env, 0, sizeof(env));
- env.selector = selector;
- env.sched_info = NEW_ARR_F(sched_irn_t, num_nodes);
-
- memset(env.sched_info, 0, num_nodes * sizeof(env.sched_info[0]));
+ env.selector = selector;
+ env.scheduled = rbitset_malloc(num_nodes);
if (selector->init_graph != NULL)
env.selector_env = selector->init_graph(irg);
if (selector->finish_graph != NULL)
selector->finish_graph(env.selector_env);
- DEL_ARR_F(env.sched_info);
+ free(env.scheduled);
}
-BE_REGISTER_MODULE_CONSTRUCTOR(be_init_listsched);
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_listsched)
void be_init_listsched(void)
{
FIRM_DBG_REGISTER(dbg, "firm.be.sched");
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