bitset_t *moved = bitset_alloca(arity);
int n_moved;
int new_size;
- ir_node *frontier = sched_first(bl);
+ ir_node *frontier = bl;
FIRM_DBG_REGISTER(firm_dbg_module_t *mod, "firm.be.lower.permmove");
int i, n;
const ir_edge_t *edge;
- ir_node *last_proj = NULL, *irn;
+ ir_node *one_proj = NULL, *irn;
const arch_register_class_t *cls = NULL;
DBG((mod, LEVEL_1, "perm move %+F irg %+F\n", perm, irg));
- /* get some proj and find out the register class of the proj. */
- foreach_out_edge (perm, edge) {
- last_proj = get_edge_src_irn(edge);
- cls = arch_get_irn_reg_class(aenv, last_proj, -1);
- assert(is_Proj(last_proj));
- break;
- }
+ /* get some Proj and find out the register class of that Proj. */
+ edge = get_irn_out_edge_first_kind(perm, EDGE_KIND_NORMAL);
+ one_proj = get_edge_src_irn(edge);
+ assert(is_Proj(one_proj));
+ cls = arch_get_irn_reg_class(aenv, one_proj, -1);
- /* find the point in the schedule after which the
+ /* Find the point in the schedule after which the
* potentially movable nodes must be defined.
- * A perm will only be pushed up to first instruction
- * which lets an operand of itself die. */
-
+ * A Perm will only be pushed up to first instruction
+ * which lets an operand of itself die.
+ * If we would allow to move the Perm above this instruction,
+ * the former dead operand would be live now at the point of
+ * the Perm, increasing the register pressure by one.
+ */
sched_foreach_reverse_from (sched_prev(perm), irn) {
- for(i = get_irn_arity(irn) - 1; i >= 0; --i) {
+ for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
ir_node *op = get_irn_n(irn, i);
- if(arch_irn_consider_in_reg_alloc(aenv, cls, op)
- && !values_interfere(env->birg, op, last_proj)) {
+ if (arch_irn_consider_in_reg_alloc(aenv, cls, op)
+ && !values_interfere(env->birg, op, one_proj)) {
frontier = sched_next(irn);
goto found_front;
}
int input = -1;
ir_node *proj;
+ /* search if node is a INPUT of Perm */
foreach_out_edge(perm, edge) {
ir_node *out = get_edge_src_irn(edge);
int pn = get_Proj_proj(out);
ir_node *in = get_irn_n(perm, pn);
- if(node == in) {
+ if (node == in) {
proj = out;
input = pn;
break;