PR rtl-optimization/28071
* basic-block.h (bb_dom_dfs_in, bb_dom_dfs_out): Declare.
* dominance.c (bb_dom_dfs_in, bb_dom_dfs_out): New functions.
* tree-into-ssa.c (struct dom_dfsnum): New.
(cmp_dfsnum, find_dfsnum_interval, prune_unused_phi_nodes): New
functions.
(insert_phi_nodes_for): Use prune_unused_phi_nodes instead of
compute_global_livein.
(prepare_block_for_update, prepare_use_sites_for): Mark the uses
in phi nodes in the correct blocks.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116190
138bc75d-0d04-0410-961f-
82ee72b054a4