/**
* @file beuse.c
* @date 27.06.2005
- * @author Sebastian Hack
+ * @author Sebastian Hack, Matthias Braun
*
* Methods to compute when a value will be used again.
*
* Copyright (C) 2005 Universitaet Karlsruhe
* Released under the GPL
*/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
#include <limits.h>
#include <stdlib.h>
#include "beirgmod.h"
#include "bearch.h"
#include "beuses_t.h"
+#include "benodesets.h"
-#define DBG_LEVEL SET_LEVEL_0
+#define SCAN_INTERBLOCK_USES
typedef struct _be_use_t {
- const ir_node *bl;
- const ir_node *irn;
+ const ir_node *block;
+ const ir_node *node;
unsigned next_use;
} be_use_t;
struct _be_uses_t {
- set *uses;
- ir_graph *irg;
- const be_lv_t *lv;
- const arch_env_t *arch_env;
- DEBUG_ONLY(firm_dbg_module_t *dbg;)
+ set *uses;
+ ir_graph *irg;
+ const ir_exec_freq *execfreqs;
+ const be_lv_t *lv;
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
};
static int cmp_use(const void *a, const void *b, size_t n)
{
- const be_use_t *p = a;
- const be_use_t *q = b;
- return !(p->bl == q->bl && p->irn == q->irn);
+ const be_use_t *p = a;
+ const be_use_t *q = b;
+ return !(p->block == q->block && p->node == q->node);
}
-static INLINE be_use_t *get_or_set_use(be_uses_t *uses,
- const ir_node *bl, const ir_node *def, unsigned next_use)
+static const be_use_t *get_or_set_use_block(be_uses_t *uses,
+ const ir_node *block,
+ const ir_node *def)
{
- unsigned hash = HASH_COMBINE(HASH_PTR(bl), HASH_PTR(def));
- be_use_t templ;
- be_use_t* result;
-
- templ.bl = bl;
- templ.irn = def;
- templ.next_use = be_get_next_use(uses, sched_first(bl), 0, def, 0);
- result = set_insert(uses->uses, &templ, sizeof(templ), hash);
+ unsigned hash = HASH_COMBINE(nodeset_hash(block), nodeset_hash(def));
+ be_use_t temp;
+ be_use_t* result;
- return result;
-}
+ temp.block = block;
+ temp.node = def;
+ result = set_find(uses->uses, &temp, sizeof(temp), hash);
-unsigned be_get_next_use(be_uses_t *uses, const ir_node *from,
- unsigned from_step, const ir_node *def, int skip_from_uses);
+ if(result == NULL) {
+ // insert templ first as we might end in a loop in the get_next_use
+ // call otherwise
+ temp.next_use = USES_INFINITY;
+ result = set_insert(uses->uses, &temp, sizeof(temp), hash);
-static unsigned get_next_use_bl(be_uses_t *uses, const ir_node *bl,
- const ir_node *def)
-{
- be_use_t *u = get_or_set_use(uses, bl, def, 0);
+ result->next_use = be_get_next_use(uses, sched_first(block), 0, def, 0);
+ }
- return u->next_use;
+ return result;
}
-static unsigned get_next_use(be_uses_t *uses, const ir_node *from, unsigned from_step, const ir_node *def, int skip_from_uses, unsigned long visited_nr)
+unsigned be_get_next_use(be_uses_t *uses, const ir_node *from,
+ unsigned from_step, const ir_node *def,
+ int skip_from_uses)
{
- unsigned next_use = USES_INFINITY;
- unsigned step = from_step;
- unsigned n = 0;
- ir_node *bl = get_nodes_block(from);
- const ir_node *irn;
- const ir_edge_t *succ_edge;
+ unsigned step = from_step;
+ ir_node *block = get_nodes_block(from);
+ const ir_node *node;
+ const ir_edge_t *edge;
- set_irn_visited(bl, visited_nr);
+ if(skip_from_uses) {
+ step++;
+ from = sched_next(from);
+ }
- sched_foreach_from(from, irn) {
- int i, n;
+ sched_foreach_from(from, node) {
+ int i, arity;
- if (! skip_from_uses) {
- for (i = 0, n = get_irn_arity(irn); i < n; ++i) {
- ir_node *operand = get_irn_n(irn, i);
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; ++i) {
+ const ir_node *operand = get_irn_n(node, i);
- if (operand == def) {
- DBG((uses->dbg, LEVEL_3, "found use of %+F at %+F\n", operand, irn));
- return step;
- }
+ if (operand == def) {
+ DBG((uses->dbg, LEVEL_3, "found use of %+F at %+F\n", operand, node));
+ return step;
}
}
- skip_from_uses = 0;
step++;
}
- /* FIXME: quick and dirty hack to prevent ignore nodes (like stack pointer) from being spilled */
- return be_is_live_end(uses->lv, bl, def) ? step : USES_INFINITY;
+ if(be_is_live_end(uses->lv, block, def))
+ return step;
+
+#ifdef SCAN_INTERBLOCK_USES
+ {
+ double best_execfreq = -1;
+ unsigned next_use = USES_INFINITY;
+
+ foreach_block_succ(block, edge) {
+ const be_use_t *use;
+ const ir_node *succ_block = get_edge_src_irn(edge);
+ double execfreq = get_block_execfreq(uses->execfreqs, succ_block);
- next_use = USES_INFINITY;
- foreach_block_succ(bl, succ_edge) {
- const ir_node *succ_bl = succ_edge->src;
- if(get_irn_visited(succ_bl) < visited_nr && (be_is_live_in(uses->lv, succ_bl, def) || (get_irn_arity(succ_bl) > 1 && be_is_live_end(uses->lv, bl, def)))) {
- unsigned next = get_next_use_bl(uses, succ_bl, def);
+ //execfreq_sum += execfreq;
- DBG((uses->dbg, LEVEL_2, "\t\tnext use in succ %+F: %d\n", succ_bl, next));
- next_use = MIN(next_use, next);
- n++;
+ if(execfreq > best_execfreq) {
+ best_execfreq = execfreq;
+
+ if(!be_is_live_in(uses->lv, succ_block, def)) {
+ next_use = USES_INFINITY;
+ continue;
+ }
+
+ use = get_or_set_use_block(uses, succ_block, def);
+ //if(USES_IS_INFINITE(use->next_use))
+ // continue;
+
+ next_use = use->next_use;
}
+
+ //next_use += use->next_use / execfreq;
}
- return next_use + step;
-}
+ /*if(next_use == 0)
+ return USES_INFINITY;*/
-unsigned be_get_next_use(be_uses_t *uses, const ir_node *from, unsigned from_step, const ir_node *def, int skip_from_uses)
-{
- unsigned long visited_nr = get_irg_visited(uses->irg) + 1;
+ //next_use /= execfreq_sum;
- set_irg_visited(uses->irg, visited_nr);
- return get_next_use(uses, from, from_step, def, skip_from_uses, visited_nr);
+ return ((unsigned) next_use) + step;
+ }
+#else
+ return USES_INFINITY;
+#endif
}
-
-be_uses_t *be_begin_uses(ir_graph *irg, const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls)
+be_uses_t *be_begin_uses(ir_graph *irg, const ir_exec_freq *execfreqs, const be_lv_t *lv)
{
- be_uses_t *uses = xmalloc(sizeof(uses[0]));
+ be_uses_t *uses = xmalloc(sizeof(uses[0]));
- edges_assure(irg);
+ edges_assure(irg);
- uses->arch_env = arch_env;
- uses->uses = new_set(cmp_use, 512);
- uses->irg = irg;
- uses->lv = lv;
- FIRM_DBG_REGISTER(uses->dbg, "firm.be.uses");
+ uses->uses = new_set(cmp_use, 512);
+ uses->irg = irg;
+ uses->execfreqs = execfreqs;
+ uses->lv = lv;
+ FIRM_DBG_REGISTER(uses->dbg, "firm.be.uses");
- return uses;
+ return uses;
}
void be_end_uses(be_uses_t *uses)
{
- del_set(uses->uses);
- free(uses);
-}
-
-int loc_compare(const void *a, const void *b)
-{
- const loc_t *p = a;
- const loc_t *q = b;
- return p->time - q->time;
+ del_set(uses->uses);
+ free(uses);
}
projects / libfirm / blobdiff