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* 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. * gcc.dg/tree-ssa/loop-25.c: New test. From-SVN: r121670
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the file COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs.html for how to report bugs usefully.