gcc4/gcc/tree-vectorizer.c

374         guard_bb:
386         guard_bb:
458            guard_bb (goto LOOP/new_merge)
468            guard_bb (goto LOOP/new_merge)
626    1. merge2_bb (to account for the edge from guard_bb)
680 	     guard_bb by slpeel_update_phi_nodes_for_guard1. I.e:
937 slpeel_add_loop_guard (basic_block guard_bb, tree cond, basic_block exit_bb,
944   enter_e = EDGE_SUCC (guard_bb, 0);
947   bsi = bsi_last (guard_bb);
957   new_e = make_edge (guard_bb, exit_bb, EDGE_TRUE_VALUE);