loop.texi: Document possibility not to perform disambiguation of loops with multiple latches.
* doc/loop.texi: Document possibility not to perform disambiguation
of loops with multiple latches.
* cfgloopmanip.c (alp_enum_p): Removed.
(add_loop): Handle subloops. Use get_loop_body_with_size.
(create_preheader): Do not allow ENTRY_BLOCK_PTR to be preheader.
* cfghooks.c (redirect_edge_and_branch_force): Set dominator for
the new forwarder block.
(make_forwarder_block): Only call new_bb_cbk if it is not NULL.
Handle the case latch is NULL.
* tree-ssa-dom.c (tree_ssa_dominator_optimize): Avoid cfg modifications
when marking loop exits.
* ifcvt.c (if_convert): Ditto. Mark loop exits even if cfg cannot
be modified.
* loop-init.c (loop_optimizer_init): Do not modify cfg. Call
disambiguate_loops_with_multiple_latches.
* tree-cfgcleanup.c (cleanup_tree_cfg_loop): Calculate dominators
before fix_loop_structure.
* cfgloop.c: Include pointer-set.h and output.h.
(canonicalize_loop_headers, HEADER_BLOCK, LATCH_EDGE,
update_latch_info, mfb_keep_just, mfb_keep_nonlatch): Removed.
(get_loop_latch_edges, find_subloop_latch_edge_by_profile,
find_subloop_latch_edge_by_ivs, find_subloop_latch_edge,
mfb_redirect_edges_in_set, form_subloop, merge_latch_edges,
disambiguate_multiple_latches, get_loop_body_with_size,
disambiguate_loops_with_multiple_latches): New functions.
(flow_loop_dump): Dump multiple latch edges.
(flow_loop_nodes_find): Handle loops with multiple latches.
(flow_loops_find): Ditto. Do not call canonicalize_loop_headers.
(glb_enum_p): Modified.
(get_loop_body): Use get_loop_body_with_size.
* cfgloop.h (LOOPS_HAVE_RECORDED_EXITS): New flag.
(AVOID_CFG_MODIFICATIONS): New constant.
(disambiguate_loops_with_multiple_latches, add_loop,
get_loop_body_with_size): Declare.
* Makefile.in (cfgloop.o): Add pointer-set.h and output.h.