- a2b = 1;
- }
-
- /* If there is no dominance relation, they do not interfere. */
- if(a2b) {
- const ir_edge_t *edge;
- ir_node *bb = get_nodes_block(b);
-
- stat_ev_dbl("beintlive_ignore", arch_irn_is(lv->birg->main_env->arch_env, a, ignore));
-
- /*
- * If a is live end in b's block it is
- * live at b's definition (a dominates b)
- */
- if(be_is_live_end(lv, bb, a)) {
- res = 1;
- goto end;
- }
-
- /*
- * Look at all usages of a.
- * If there's one usage of a in the block of b, then
- * we check, if this use is dominated by b, if that's true
- * a and b interfere. Note that b must strictly dominate the user,
- * since if b is the last user of in the block, b and a do not
- * interfere.
- * Uses of a not in b's block can be disobeyed, because the
- * check for a being live at the end of b's block is already
- * performed.
- */
- foreach_out_edge(a, edge) {
- const ir_node *user = get_edge_src_irn(edge);
- if(get_nodes_block(user) == bb && !is_Phi(user) && _value_strictly_dominates(b, user)) {
- res = 1;
- goto end;
- }
- }
- }
-
-end:
- stat_ev_ctx_pop("beintlive");
- return res;
-}
-
-
-
-/**
- * Check if a node dominates a use.
- * Note that the use of a phi is in its corresponding predecessor.
- * @param irn The node.
- * @param edge The use.
- * @return 1, if @p irn dominates the use @p edge.
- */
-static INLINE int _dominates_use(const ir_node *irn, const ir_edge_t *edge)
-{
- ir_node *use = get_edge_src_irn(edge);
-
- if (is_Phi(use)) {
- int pos = get_edge_src_pos(edge);
- ir_node *phi_bl = get_nodes_block(use);
- ir_node *use_bl = get_Block_cfgpred_block(phi_bl, pos);
- ir_node *irn_bl = get_nodes_block(irn);
- return block_dominates(irn_bl, use_bl);
- }
-
- return _value_dominates(irn, use);
-}
-
-/**
- * Check if a node strictly dominates a use.
- * Note that the use of a phi is in its corresponding predecessor.
- * @param irn The node.
- * @param edge The use.
- * @return 1, if @p irn strictly dominates the use @p edge.
- */
-static INLINE int _strictly_dominates_use(const ir_node *irn, const ir_edge_t *edge)
-{
- return get_edge_src_irn(edge) != irn && _dominates_use(irn, edge);
-}
-
-/**
- * Check, if a node is live in front of another.
- * @param birg The backend irg.
- * @param irn The node.
- * @param where The location to check for.
- * @return 1, if @p irn is live in front of @p where.
- */
-static INLINE int _be_lv_chk_before_irn(const be_irg_t *birg, const ir_node *irn, const ir_node *where)
-{
- const be_lv_t *lv = be_get_birg_liveness(birg);
- const ir_edge_t *edge;
-
- /* the node must strictly dominate the location, else it cannot be live there. */
- if (!_value_dominates(irn, where) || irn == where)
- return 0;
-
- /*
- * now that it is clear that it strictly dominates the location it is surely live
- * if it is also live end at the block.
- */
- if (be_is_live_end(lv, get_nodes_block(where), irn))
- return 1;
-
- /*
- * If the node is not live out, we have to check if there
- * is a use which is dominated by the location.
- */
- foreach_out_edge (irn, edge) {
- if (_dominates_use(where, edge))
- return 1;