#define DBG_LOOPANA 2
#define DBG_PRESSURE 4
#define DBG_SPILLS 8
+#define DBG_CHOOSE 16
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
typedef struct morgan_env {
/*---------------------------------------------------------------------------*/
+typedef struct _spillcandidate_t {
+ ir_node *node;
+ int cost;
+} spillcandidate_t;
+
+static int compare_spillcandidates(const void *d1, const void *d2) {
+ const spillcandidate_t *cand1 = d1;
+ const spillcandidate_t *cand2 = d2;
+
+ return cand1->cost - cand2->cost;
+}
+
+static void spill_values(morgan_env_t *env, const loop_attr_t *loop_attr, int spills) {
+ const bitset_t *cand_bitset = loop_attr->livethrough_unused;
+ int candidatecount = bitset_popcnt(cand_bitset);
+ spillcandidate_t *candidates;
+ int i, c;
+ loop_edge_t *edge;
+
+ assert(spills <= candidatecount);
+
+ candidates = alloca(sizeof(candidates[0]) * candidatecount);
+
+ DBG((dbg, DBG_CHOOSE, "Candidates for loop %d\n", get_loop_loop_nr(loop_attr->loop)));
+ // build candidiatelist
+ c = 0;
+ bitset_foreach(cand_bitset, i) {
+ ir_node *node = get_idx_irn(env->irg, i);
+ candidates[c].node = node;
+ candidates[c].cost = 0;
+
+ for(edge = set_first(loop_attr->out_edges); edge != NULL; edge = set_next(loop_attr->out_edges)) {
+ candidates[c].cost += be_get_reload_costs_on_edge(env->senv, node, edge->block, edge->pos);
+ }
+ DBG((dbg, DBG_CHOOSE, "%+F has costs %d\n", node, candidates[c].cost));
+
+ c++;
+ }
+ assert(c == candidatecount);
+
+ // sort list
+ qsort(candidates, candidatecount, sizeof(candidates[0]), compare_spillcandidates);
+
+ // spill values
+ for(i = 0; i < spills; ++i) {
+ ir_node *to_spill = candidates[i].node;
+ DBG((dbg, "Spilling %+F ", to_spill));
+
+ for(edge = set_first(loop_attr->out_edges); edge != NULL; edge = set_next(loop_attr->out_edges)) {
+ be_add_reload_on_edge(env->senv, to_spill, edge->block, edge->pos);
+ }
+ }
+}
+
static int reduce_register_pressure_in_block(morgan_env_t *env, const ir_node* block, int loop_unused_spills_possible) {
ir_node *node;
int max_pressure;
DBG((dbg, DBG_SPILLS, "%d values unused in loop %d, spilling %d\n",
spills_possible - outer_spills_possible, loop->loop_nr, spills_to_place));
- bitset_foreach(loop_attr->livethrough_unused, i) {
- loop_edge_t *edge;
- ir_node *to_spill = get_idx_irn(env->irg, i);
-
- DBG((dbg, DBG_SPILLS, "Spilling node %+F around loop %d\n", to_spill, loop->loop_nr));
-
- for(edge = set_first(loop_attr->out_edges); edge != NULL; edge = set_next(loop_attr->out_edges)) {
- be_add_reload_on_edge(env->senv, to_spill, edge->block, edge->pos);
- }
-
- spills_to_place--;
- if(spills_to_place <= 0) {
- break;
- }
- }
+ spill_values(env, loop_attr, spills_to_place);
} else {
outer_spills_needed = spills_needed;
}