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* basic-block.h (EDGE_IRREDUCIBLE_LOOP, EDGE_ALL_FLAGS): New.
* cfg.c (dump_edge_info): Add EDGE_IRREDUCIBLE_LOOP flag dump.
* cfgloop.c (flow_loop_free): Made global.
(establish_preds): New static function.
(flow_loop_tree_node_add): Handle subloops of added loop correctly.
(get_loop_exit_edges): New.
(verify_loop_structure): Verify EDGE_IRREDUCIBLE_LOOP flags.
* cfgloop.h (flow_loop_free, get_loop_exit_edges, unloop): Declare.
* cfgloopanal.c (mark_irreducible_loops): Mark edges in irreducible
loops.
* cfgloopmanip.c (loop_delete_branch_edge): Allow to test for
removability of an edge.
(fix_irreducible_loops): New static function.
(find_path, remove_path): Add ability to remove enclosing loops.
(unloop): New.
(copy_bbs, duplicate_loop_to_header_edge): Use EDGE_IRREDUCIBLE_LOOP
flags.
* cfgrtl.c (verify_flow_info): Handle EDGE_IRREDUCIBLE_LOOP flag.
* loop-unroll.c (peel_loops_completely): Do not duplicate loop if
not neccessary.
(decide_peel_completely, peel_loops_completely): Allow complete peeling
of non-duplicable once rolling loops.
* loop-unswitch.c (unswitch_loop): Update EDGE_IRREDUCIBLE_LOOP flags.
From-SVN: r63864
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* cfgloop.h (fix_loop_placement, can_duplicate_loop_p,
duplicate_loop_to_header_edge, loopify, remove_path, split_loop_bb):
Declare.
(DLTHE_FLAG_UPDATE_FREQ): New.
* cfgloopmanip.c (duplicate_loop, duplicate_subloops, copy_loops_to,
loop_redirect_edge, loop_delete_branch_edge, copy_bbs, remove_bbs,
rpe_enum_p, find_branch, alp_enum_p, add_loop, fix_loop_placements,
fix_bb_placement, fix_bb_placements, place_new_loop,
scale_loop_frequencies, scale_bbs_frequencies, record_exit_edges):
New static functions.
(fix_loop_placement, can_duplicate_loop_p,
duplicate_loop_to_header_edge, loopify, remove_path, split_loop_bb):
New functions.
* cfgloop.h (loop_optimizer_init, loop_optimizer_finalize,
unswitch_loops): Declare.
* loop-init.c: New file.
* loop-unswitch.c: New file.
* Makefile.in (loop-init.o, loop-unswitch.o): New.
* params.def (PARAM_MAX_UNSWITCH_INSNS, PARAM_MAX_UNSWITCH_LEVEL): New.
* toplev.c (DFI_loop2): New dump.
(flag_unswitch_loops): New.
(lang_independent_options): Add it.
(rest_of_compilation): Call new loop optimizer.
(parse_options_and_default_flags): Turn flag_unswitch_loops on with -O3.
From-SVN: r62578
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