* Makefile.in (tree-optimize.o): Add CFGLOOP_H dependence.
	* cfgloop.c (flow_loop_nodes_find): Export.
	* cfgloop.h (flow_loop_nodes_find, fix_loop_structure):
	Declare.
	* cfgloopmanip.c (fix_loop_structure): New function.
	* predict.c (predict_loops): Clean up the loops information.
	* tree-cfg.c (cleanup_tree_cfg_loop): New function.
	(tree_can_merge_blocks_p, remove_bb, tree_forwarder_block_p): Respect
	loop structure.
	* tree-flow.h (cleanup_tree_cfg_loop): Declare.
	(rewrite_into_loop_closed_ssa): Declaration changed.
	* tree-loop-linear.c (linear_transform_loops): Add argument to
	rewrite_into_loop_closed_ssa call.
	* tree-ssa-loop-ch.c (copy_loop_headers): Ditto.
	* tree-ssa-loop-im.c (move_computations): Ditto.
	* tree-ssa-loop.c (tree_loop_optimizer_init): Ditto.
	* tree-vectorizer.c (vectorize_loops): Ditto.
	* tree-optimize.c: Include cfgloop.h.
	(execute_todo): Choose whether to call cleanup_tree_cfg or
	cleanup_tree_cfg_loop.
	* tree-ssa-loop-ivcanon.c (canonicalize_loop_induction_variables,
	(tree_unroll_loops_completely): Enable cleanup_tree_cfg_loop call.
	* tree-ssa-loop-unswitch.c (tree_ssa_unswitch_loops): Enable
	cleanup_tree_cfg_loop call.
	* tree-ssa-loop-manip.c (find_uses_to_rename_bb): New function.
	(find_uses_to_rename, rewrite_into_loop_closed_ssa): Support
	work on part of cfg.

From-SVN: r96232

	* cfgloop.h, cfgloopanal.c, cfgloopmanip.c, conflict.c,
	loop-init.c, loop-unroll.c, print-tree.c, reg-notes.def,
	config/m68k/m68k.c, config/mips/mips.h,
	config/rs6000/rs6000-protos.h, doc/contrib.texi,
	doc/include/gcc-common.texi: Update copyright.

From-SVN: r95781

	* cfgloop.c (flow_loop_entry_edges_find, flow_loop_exit_edges_find,
	flow_loop_pre_header_scan, flow_loop_pre_header_find,
	flow_loop_scan): Removed.
	(flow_loop_dump): Do not dump removed fields.
	(flow_loop_free): Do not free removed fields.
	(flow_loops_find): Flags argument removed.  Do not call flow_loop_scan.
	(loop_exit_edge_p): New function.
	* cfgloop.h (struct loop): Removed fields pre_header, pre_header_edges,
	num_pre_header_edges, entry_edges, num_entries, exit_edges,
	num_exits, exits_doms.
	(LOOP_TREE, LOOP_PRE_HEADER, LOOP_ENTRY_EDGES, LOOP_EXIT_EDGES,
	LOOP_EDGES, LOOP_ALL): Removed.
	(flow_loop_scan): Declaration removed.
	(loop_exit_edge_p, mark_loop_exit_edges): Declare.
	* cfgloopmanip.c (create_loop_notes): Do not pass flags to
	flow_loops_find.
	* ifcvt.c (mark_loop_exit_edges): Moved to cfgloopanal.c.
	(if_convert): Call flow_loops_find and flow_loops_free
	when calling mark_loop_exit_edges.
	* cfgloopanal.c (mark_loop_exit_edges): Moved from
	ifcvt.c.  Removed the flow_loops_find, flow_loops_free and
	free_dominance_info calls.
	* loop-init.c (flow_loops_find): Ditto.
	* passes.c (rest_of_handle_branch_prob): Ditto.
	* lambda-code.c (perfect_nestify): Do not call flow_loops_find.
	* loop-unroll.c (analyze_insns_in_loop): Do not use
	EDGE_LOOP_EXIT.
	* predict.c (predict_loops): Do not call flow_loop_scan.
	Use get_loop_exit_edges.
	(tree_estimate_probability): Do not pass flags to flow_loops_find.
	* tree-if-conv.c (bb_with_exit_edge_p): Take loop as argument.
	Do not use EDGE_LOOP_EXIT.
	(tree_if_convert_cond_expr, if_convertible_modify_expr_p): Pass loop
	to bb_with_exit_edge_p.
	(if_convertible_loop_p): Do not call flow_loop_scan.  Use
	loop->single_exit.  Do not use EDGE_LOOP_EXIT.  Pass loop
	to bb_with_exit_edge_p.
	(combine_blocks): Pass loop to bb_with_exit_edge_p.  Do not use
	EDGE_LOOP_EXIT.
	* tree-loop-linear.c (linear_transform_loops): Do not call
	flow_loop_scan.  Use loop->single_exit.
	* tree-vect-analyze.c (vect_analyze_operations): Use loop->single_exit.
	(vect_analyze_loop_form): Do not call flow_loop_scan.
	* tree-vect-transform.c (vect_update_ivs_after_vectorizer): Use
	loop->single_exit.
	(vect_do_peeling_for_loop_bound): Use loop_preheader_edge and
	loop->single_exit.
	* tree-vectorizer.c (slpeel_update_phis_for_duplicate_loop,
	slpeel_make_loop_iterate_ntimes, slpeel_can_duplicate_loop_p,
	slpeel_tree_duplicate_loop_to_edge_cfg,
	slpeel_verify_cfg_after_peeling, slpeel_tree_peel_loop_to_edge):
	Use loop_preheader_edge and loop->single_exit.  Do not call
	flow_loop_scan.

From-SVN: r95738

2004-12-15  Daniel Berlin  <dberlin@dberlin.org>

	* cfgloop.c (flow_loops_dump): Don't print out levels.
	(flow_loops_find): Don't set loop->levels.
	(flow_loops_level_compute): Make void.
	* cfgloop.h (struct loops): Remove levels member.
	Add comment about loops in parray possibly being NULL.

From-SVN: r92222

	* cfgloopmanip.c (update_single_exits_after_duplication,
	unloop): Make them static.
	* cfgloop.h: Remove the corresponding prototypes.

From-SVN: r90503

	* loop-iv.c (iv_number_of_iterations): Make it static.
	* cfgloop.h: Remove the corresponding prototype.

From-SVN: r90358

	* cfgloop.c (flow_loops_update): Remove.
	* cfgloop.h: Remove the corresponding prototype.

From-SVN: r90355

	* cfgloop.h (struct loop): Update comment.
	* cse.c (cse_main): Remove obsolete comment.

	* expr.h (gen_cond_trap): Move prototype under functions provided
	by optabs.c.
	(canonicalize_condition, get_condition): Move to...
	* rtl.h (canonicalize_condition, get_condition): ...here.
	(branch_target_load_optimize): Add comment that this function is
	in bt-load.c.
	* loop.c (canonicalize_condition, get_condition): Move to...
	* rtlanal.c (canonicalize_condition, get_condition): ...here.
	* sched-deps.c (get_condition): Rename to sched_get_condition.
	(add_dependence): Update this caller.

From-SVN: r89995

	* cfgloop.h (struct loop): Remove unused "nodes" field.
	* timevar.def (TV_TREE_LOOP_BOUNDS): New.
	* tree-data-ref.c (find_data_references_in_loop): Use get_loop_body
	instead of calling flow_bb_inside_loop_p for every basic block
	in the function.
	* tree-ssa-loop.c (pass_record_bounds): Use TV_TREE_LOOP_BOUNDS.

From-SVN: r89932

	* cfgloopmanip.c (loopify): Take two more arguments true_edge
	and false_edge.
	* cfgloop.h: Adjust the corresponding prototype.
	* loop-unswitch.c (unswitch_loop): Adjust a call to loopify.
	* tree-ssa-loop-manip.c (tree_ssa_loop_version): Likewise.

From-SVN: r89555

2004-10-11  Sebastian Pop  <pop@cri.ensmp.fr>

	* Makefile.in (tree-ssa-loop-niter.o): Depends on tree-data-ref.h.
	* cfgloop.c (initialize_loops_parallel_p): New.
	(flow_loops_find): Initialize the parallel_p field to true for all
	the loops.
	* tree-ssa-loop-niter.c: Include "tree-data-ref.h".
	(estimate_numbers_of_iterations_loop): Infers the loop bounds from
	the size of the data accessed in the loop.
	(struct nb_iter_bound): Moved...
	* cfgloop.h (struct nb_iter_bound): ... here.
	(estimated_nb_iterations, parallel_p): New fields in struct loop.
	(record_estimate): Declare extern here.
	* tree-chrec.c: Fix comments.
	(nb_vars_in_chrec): New function.
	* tree-chrec.h (nb_vars_in_chrec): Declared here.
	* tree-data-ref.c: Don't include lambda.h, that is already included
	in tree-data-ref.h.
	(tree_fold_divides_p): Don't check for integer_onep.
	(tree_fold_bezout): Removed.
	(gcd): New static duplicated function.
	(int_divides_p, dump_subscript): New.
	(dump_data_dependence_relation): Use dump_subscript.
	(dump_dist_dir_vectors, dump_ddrs, compute_estimated_nb_iterations,
	estimate_niter_from_size_of_data): New.
	(analyze_array_indexes, analyze_array): Call
	estimate_niter_from_size_of_data during	the detection of array
	references.  Pass in a pointer to the statement that contains the
	array reference.
	(all_chrecs_equal_p): New.
	(compute_distance_vector): Renamed compute_subscript_distance.
	Deal with multivariate conflict functions.
	(initialize_data_dependence_relation): Initialize DDR_AFFINE_P,
	DDR_SIZE_VECT, DDR_DIST_VECT, and DDR_DIR_VECT.
	(non_affine_dependence_relation): New.
	(analyze_ziv_subscript, analyze_siv_subscript_cst_affine,
	analyze_siv_subscript, analyze_miv_subscript,
	analyze_overlapping_iterations, subscript_dependence_tester):
	Initialize and return last_conflicts function.
	(initialize_matrix_A, FLOOR, compute_overlap_steps_for_affine_univar,
	compute_overlap_steps_for_affine_1_2): New.
	(analyze_siv_subscript_affine_cst): Removed.
	(analyze_subscript_affine_affine): Disprove dependences based on the
	iteration domains.  Solve the univariate dependence case as before,
	but use lambda_matrix_right_hermite instead of tree_fold_bezout.
	Implement the multivariate case of 2 versus 1 variables.
	(build_classic_dist_vector, build_classic_dir_vector): Implement some
	unhandled cases.
	(find_data_references_in_loop): Compute and initialize
	loop->estimated_nb_iterations and loop->parallel_p.
	(analyze_all_data_dependences): Modify the debug dump order.
	* tree-data-ref.h (SUB_LAST_CONFLICT_IN_A, SUB_LAST_CONFLICT_IN_B,
	subscript->last_conflict_in_a, subscript->last_conflict_in_b): Removed.
	(SUB_LAST_CONFLICT, subscript->last_conflict,
	data_dependence_relation->affine_p, data_dependence_relation->size_vect,
	DDR_AFFINE_P, DDR_SIZE_VECT): New.
	(find_data_references_in_loop, initialize_data_dependence_relation,
	dump_subscript, dump_ddrs, dump_dist_dir_vectors): Declared here.

From-SVN: r88965

	* cfgloop.h (update_single_exits_after_duplication): Declare.
	(loopify, split_loop_bb): Declaration changed.
	* cfgloopmanip.c (split_loop_bb): Take void * as an argument instead
	of rtx.
	(loopify): Added redirect_all_edges argument.
	(update_single_exits_after_duplication): Export.
	* loop-unswitch.c (unswitch_loop): Changed due to loopify change.
	* tree-flow.h (tree_duplicate_loop_to_header_edge,
	tree_ssa_loop_version): Declare.
	* tree-ssa-loop-manip.c (copy_phi_node_args, rename_variables,
	set_phi_def_stmts, tree_duplicate_loop_to_header_edge,
	lv_adjust_loop_header_phi, lv_adjust_loop_entry_edge,
	lv_update_pending_stmts, tree_ssa_loop_version): New functions.

	* tree-ssa-loop-unswitch.c: New file.
	* Makefile.in (tree-ssa-loop-unswitch.o): Add.
	* timevar.def (TV_TREE_LOOP_UNSWITCH): New timevar.
	* tree-flow.h (tree_ssa_unswitch_loops): Declare.
	* tree-optimize.c (init_tree_optimization_passes): Add pass_unswitch.
	* tree-pass.h (pass_unswitch): Declare.
	* tree-ssa-loop.c (tree_ssa_loop_unswitch,
	gate_tree_ssa_loop_unswitch, pass_unswitch): New pass.
	* doc/passes.texi: Documen tree level loop unswitching.

	* gcc.dg/tree-ssa/loop-6.c: New test.

From-SVN: r87943

2004-09-16  Daniel Berlin  <dberlin@dberlin.org>

	* cfgloop.h (duplicate_loop):  Add prototype.
	* cfgloopmanip.c (duplicate_loop): Make non-static.
	* lambda-code.c (perfect_nestify): Factor out test whether
	we can handle this loop into separate function.
	Call it.
	(can_convert_to_perfect_nest): New function.
	(replace_uses_of_x_with_y): Add modify_stmt call.
	* tree-loop-linear.c (linear_transform_loops): Call
	rewrite_into_loop_closed_ssa and free_df.

2004-09-16  Daniel Berlin  <dberlin@dberlin.org>

	* lambda-code.c (invariant_in_loop): is_gimple_min_invariant is
	loop invariant as well.
	(perfect_nestify): new function.
	(gcc_loop_to_lambda_loop): New parameters to track lower bounds,
	upper bounds, and steps.
	Set outerinductionvar properly.
	(gcc_loopnest_to_lambda_loopnest): Add loops and need_perfect
	parameters.
	Return NULL if we need a perfect loop and can't make one.
	(lambda_loopnest_to_gcc_loopnest): Correct algorithm.
	(not_interesting_stmt): New function.
	(phi_loop_edge_uses_def): Ditto.
	(stmt_uses_phi_result): Ditto.
	(stmt_is_bumper_for_loop): Ditto.
	(perfect_nest_p): Ditto.
	(nestify_update_pending_stmts): Ditto.
	(replace_uses_of_x_with_y): Ditto.
	(stmt_uses_op): Ditto.
	(perfect_nestify): Ditto.
	* lambda-mat.c (lambda_matrix_id_p): New function.
	* lambda-trans.c (lambda_trans_matrix_id_p): Ditto.
	* lambda.h: Update prototypes.
	* tree-loop-linear (linear_transform_loop): Use new
	perfect_nest_p. Detect and ignore identity transform.
	* tree-ssa-loop.c (pass_linear_transform): Use TODO_write_loop_closed.

2004-09-16  Sebastian Pop  <pop@cri.ensmp.fr>

	* tree-loop-linear.c (gather_interchange_stats): Add more comments.
	Gather also strides of accessed data.  Pass in the data references
	array.
	(try_interchange_loops): Add a new heuristic for handling the temporal
	locality.  Pass in the data references array.
	(linear_transform_loops): Pass the data references array to
	try_interchange_loops.

From-SVN: r87607

	* Makefile.in (loop-unroll.o): Add HASHTAB_H and RECOG_H dependency.
	* basic-block.h (struct reorder_block_def): Add copy_number field.
	* cfgloop.h (biv_p): Declare.
	* cfgloopmanip.c (duplicate_loop_to_header_edge): Set copy_number.
	* common.opt (fsplit-ivs-in-unroller): New flag.
	* loop-iv.c (biv_p): New function.
	* loop-unroll.c: Include hashtab.h and recog.h.
	(struct iv_to_split, struct split_ivs_info): New types.
	(analyze_ivs_to_split, si_info_start_duplication, split_ivs_in_copies,
	free_si_info, si_info_hash, si_info_eq, analyze_iv_to_split_insn,
	determine_split_iv_delta, get_ivts_expr, allocate_basic_variable,
	insert_base_initialization, split_iv): New functions.
	(peel_loop_completely, unroll_loop_constant_iterations,
	unroll_loop_runtime_iterations, peel_loop_simple, unroll_loop_stupid):
	Use them.
	* doc/invoke.texi (-fsplit-ivs-in-unroller): Document.

Co-Authored-By: Steven Bosscher <stevenb@suse.de>

From-SVN: r87487

	* unroll.c: Removed.
	* loop.h: Removed.
	* Makefile.in (LOOP_H, unroll.o): Removed.
	(toplev.o, passes.o, stmt.o, integrate.o, loop.o): Remove LOOP_H
	dependency.
	* alias.c (init_alias_analysis): Remove flag_old_unroll_loops
	reference.
	* cfgloop.h (LOOP_PREFETCH, loop_optimize): Moved from loop.h.
	* common.opt (fold-unroll-loops, fold-unroll-all-loops): Removed.
	* loop.c: Do not include loop.h.
	(LOOP_INFO, LOOP_MOVABLES, LOOP_REGS, LOOP_IVS, INSN_LUID,
	REGNO_FIRST_LUID, REGNO_LAST_LUID, enum g_types, struct induction,
	struct iv_class, enum iv_mode, struct iv, REG_IV_TYPE, REG_IV_INFO,
	REG_IV_CLASS, struct loop_ivs, struct loop_mem_info, struct loop_reg,
	struct loop_regs, struct loop_movables, struct loop_info): Moved
	from loop.h.
	(back_branch_in_range_p, fold_rtx_mult_add, biv_total_increment,
	reg_dead_after_loop, final_biv_value, loop_find_equiv_value,
	find_common_reg_term, loop_iterations, final_giv_value): Moved
	from unroll.c.
	(uid_luid, uid_loop, max_uid_for_loop, max_reg_before_loop,
	loop_dump_stream, for_each_insn_in_loop, express_from,
	extend_value_for_giv, loop_iv_add_mult_emit_before,
	loop_iv_add_mult_sink, loop_iv_add_mult_hoist,
	loop_insn_first_p, get_condition_for_loop,
	loop_insn_emit_before, loop_insn_hoist,
	loop_insn_sink): Made static.
	(loop_invariant_p): Made static.  Removed flag_old_unroll_loops
	reference.
	(strength_reduce): Do not call unroller.
	(record_giv): Do not initialize unrolled field.
	(prescan_loop): Do not set loop_info->preconditioned.
	* passes.c: Do not include loop.h.
	(rest_of_handle_loop_optimize): Do not call unroller.
	* predict.c: Do not include loop.h.
	* rtl.h (NOTE_PRECONDITIONED): Removed.
	* stmt.c: Do not include loop.h.
	* toplev.c: Do not include loop.h.
	(process_options): Do not handle flag_old_unroll_loops.

	* doc/invoke.texi (fold-unroll-loops, fold-unroll-all-loops):
	Documentation removed.
	* doc/passes.texi (unroll.c, loop.h): Documentation removed.

From-SVN: r87485

	* tree-ssa-loop-ivopts.c: New file.
	* Makefile.in (tree-ssa-loop-ivopts.c): Add.
	* cfgloop.h (target_avail_regs, target_res_regs, target_small_cost,
	target_pres_cost, target_spill_cost): Declare.
	* cfgloopanal.c (avail_regs, res_regs, small_cost, pres_cost,
	spill_cost): Renamed to ...
	(target_avail_regs, target_res_regs, target_small_cost,
	target_pres_cost, target_spill_cost): ... and exported.
	(init_set_costs, global_cost_for_size): Work with renamed variables.
	* common.opt (flag_ivopts): New flag.
	* expr.c (expand_expr_real_1): Handle SSA_NAME case.  Handle
	REF_ORIGINAL.
	* gimplify.c (struct gimplify_ctx): Add into_ssa field.
	(internal_get_tmp_var, gimplify_modify_expr, gimplify_expr): Support
	generating SSA form.
	(force_gimple_operand): New function.
	* timevar.def (TV_TREE_LOOP_IVOPTS): New timevar.
	* tree-cfg.c (stmt_bsi): New function.
	* params.def (PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
	PARAM_IV_MAX_CONSIDERED_USES): New.
	* tree-flow.h (stmt_bsi, tree_ssa_iv_optimize, split_loop_exit_edge,
	bsi_insert_on_edge_immediate_loop. standard_iv_increment_position,
	ip_end_pos, ip_normal_pos, force_gimple_operand): Declare.
	* tree-gimple.c (is_gimple_formal_tmp_var): Accept ssa names.
	* tree-nested.c (build_addr): Export.
	* tree-optimize.c (init_tree_optimization_passes): Add
	pass_iv_optimize.
	* tree-pass.h (pass_iv_optimize): Declare.
	* tree-ssa-loop-im.c (for_each_index): Handle REALPART_EXPR and
	IMAGPART_EXPR.
	* tree-ssa-loop-manip.c (create_iv): Force the base to be acceptable
	as a phi node argument.
	(split_loop_exit_edge, bsi_insert_on_edge_immediate_loop,
	ip_end_pos, ip_normal_pos, standard_iv_increment_position): New
	functions.
	* tree-ssa-loop-niter.c (zero_p, unsigned_type_for): Export.
	* tree-ssa-loop.c (tree_ssa_loop_ivopts, gate_tree_ssa_loop_ivopts,
	pass_iv_optimize): New pass.
	* tree-ssa-operands.c (get_indirect_ref_operands): Handle REF_ORIGINAL.
	* tree-ssanames.c (release_ssa_name): Allow calling with var = NULL.
	* tree.c (build_int_cst_type, cst_and_fits_in_hwi): New functions.
	* tree.h (REF_ORIGINAL): New macro.
	(build_int_cst_type, unsigned_type_for, zero_p,
	cst_and_fits_in_hwi, build_addr): Declare.
	* doc/invoke.texi (-fivopts): Document.
	(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
	PARAM_IV_MAX_CONSIDERED_USES): Document.
	* doc/passes.texi: Document induction variable optimizations pass.

	* gcc.dg/tree-ssa/loop-2.c: New test.
	* gcc.dg/tree-ssa/loop-3.c: New test.
	* gcc.dg/tree-ssa/loop-4.c: New test.
	* gcc.dg/tree-ssa/loop-5.c: New test.

From-SVN: r87100

        * Makefile.in (OBJS-common): Add tree-if-conv.o
        (tree-if-conv.o): New rule.
        * cfgloop.c (flow_loop_exit_edges_find): Set EDGE_LOOP_EXIT flag.
        (get_loop_body_in_bfs_order): New.
        * cfgloop.h (get_loop_body_in_bfs_order): New.
        * tree-flow.h (enum move_pos): Move here from ..
        * tree-ssa-loop-im.c (enum move_pos): here.
        (movement_possibility): Make externally visible.
        * tree-optimize.c (init_tree_optimization_passes): New entry for
        if conversion pass.
        * tree-pass.h (pass_if_conversion): New.
        * tree-ssa-operands.c (get_expr_operands): Handle COND_EXPR.
        * tree-if-conv.c: New file.
        * doc/passes.texi: Document tree if-conversion pass.
        * doc/tree-ssa.texi: Same.

        testsuite:

        * gcc.dg/tree-ssa/ifc-20040816-1.c: New test.
        * gcc.dg/tree-ssa/ifc-20040816-2.c: New test.

From-SVN: r87073

cfglayout.c (duplicate_insn_chain): Remove references to NOTE_INSN_LOOP_VTOP and NOTE_INSN_LOOP_CONT.

2004-04-25  Paolo Bonzini  <bonzini@gnu.org>

	* cfglayout.c (duplicate_insn_chain): Remove references to
	NOTE_INSN_LOOP_VTOP and NOTE_INSN_LOOP_CONT.
	* cfgloop.h (struct loop): Remove fields vtop, cont and cont_dominator.
	* cfgrtl.c (rtl_delete_block): Remove handling of NOTE_INSN_LOOP_CONT.
	* final.c (final_scan_insn): Remove references to NOTE_INSN_LOOP_VTOP
	and NOTE_INSN_LOOP_CONT.
	* insn-notes.def (NOTE_INSN_LOOP_VTOP, NOTE_INSN_LOOP_CONT): Remove.
	* jump.c (squeeze_notes): Remove references to NOTE_INSN_LOOP_VTOP
	and NOTE_INSN_LOOP_CONT.
	* loop.c (scan_loops, find_and_verify_loops, for_each_insn_in_loop,
	check_dbra_loop, loop_dump_aux): Remove references to removed notes
	and fields.
	* reorg.c (mostly_true_jump): Do not rely on NOTE_INSN_LOOP_VTOPs.
	* unroll.c (unroll_loop, copy_loop_body, loop_iterations): Remove
	references to removed notes and fields.
	(subtract_reg_term, ujump_to_loop_cont): Remove.

From-SVN: r86542

	* tree-ssa-loop-ivcanon.c: New file.
	* tree-ssa-loop-manip.c (create_iv): New function.
	* Makefile.in (tree-ssa-loop-ivcanon.o): Add.
	(tree-ssa-loop.o, tree-ssa-loop-manip.o): Add SCEV_H dependency.
	* cfgloop.c (mark_single_exit_loops): New function.
	(verify_loop_structure): Verify single-exit loops.
	* cfgloop.h (struct loop): Add single_exit field.
	(LOOPS_HAVE_MARKED_SINGLE_EXITS): New constant.
	(mark_single_exit_loops): Declare.
	(tree_num_loop_insns): Declare.
	* cfgloopmanip.c (update_single_exits_after_duplication): New function.
	(duplicate_loop_to_header_edge): Use it.
	* common.opt (fivcanon): New flag.
	* timevar.def (TV_TREE_LOOP_IVCANON, TV_COMPLETE_UNROLL): New timevars.
	* tree-cfg.c (tree_find_edge_insert_loc): Return newly created block.
	(bsi_commit_edge_inserts_1): Pass null to tree_find_edge_insert_loc.
	(bsi_insert_on_edge_immediate): New function.
	* tree-flow.h (bsi_insert_on_edge_immediate,
	canonicalize_induction_variables, tree_unroll_loops_completely,
	create_iv): Declare.
	* tree-optimize.c (init_tree_optimization_passes): Add
	pass_iv_canon and pass_complete_unroll.
	* tree-pass.h (pass_iv_canon, pass_complete_unroll): Declare.
	* tree-scalar-evolution.c (get_loop_exit_condition,
	get_exit_conditions_rec, number_of_iterations_in_loop,
	scev_initialize): Use single_exit information.
	* tree-ssa-loop-niter.c (number_of_iterations_cond): Record
	missing assumptions.
	(loop_niter_by_eval):  Return number of iterations as unsigned
	int.
	* tree-ssa-loop.c (tree_ssa_loop_init): Mark single exit loops.
	(tree_ssa_loop_ivcanon, gate_tree_ssa_loop_ivcanon, pass_iv_canon,
	tree_complete_unroll, gate_tree_complete_unroll, pass_complete_unroll):
	New passes.
	(tree_ssa_loop_done): Call free_numbers_of_iterations_estimates.
	* tree-ssanames.c (make_ssa_name): Allow creating ssa name before
	the defining statement is ready.
	* tree-vectorizer.c (vect_create_iv_simple): Removed.
	(vect_create_index_for_array_ref, vect_transform_loop_bound):
	Use create_iv.
	(vect_transform_loop_bound): Use single_exit information.
	(vect_analyze_loop_form): Cleanup bogus tests.
	(vectorize_loops): Do not call flow_loop_scan.
	* tree.h (may_negate_without_overflow_p): Declare.
	* fold-const.c (may_negate_without_overflow_p): Split out from ...
	(negate_expr_p): ... this function.
	(tree_expr_nonzero_p): Handle overflowed constants correctly.
	* doc/invoke.texi (-fivcanon): Document.
	* doc/passes.texi: Document canonical induction variable creation.

	* gcc.dg/tree-ssa/loop-1.c: New test.

From-SVN: r86516

	* rtl.def (NIL): Delete.
	* read-rtl.c (read_rtx): Handle (nil) like (define_constants).
	Tighten the syntax a little.

	* cfgloop.h, combine.c, cse.c, loop-iv.c, postreload.c, reload.c
	* config/alpha/alpha.c, config/alpha/alpha.h, config/arc/arc.h
	* config/arm/arm.h, config/frv/frv.h, config/i386/i386.c
	* config/i386/predicates.md, config/m32r/m32r.h
	* config/m68hc11/m68hc11.c, config/mcore/mcore.h, config/mips/mips.c
	* config/mmix/mmix.c, config/pa/pa.h, config/sh/sh.h
	* config/sparc/sparc.h, doc/tm.texi:
	Replace all occurrences of NIL with UNKNOWN.

From-SVN: r86193

	* cfgloop.h (struct loop): Add nb_iterations field.
	(current_loops): Declare.
	* tree-chrec.c (chrec_not_analyzed_yet,
	chrec_dont_know, chrec_known, count_ev_in_wider_type,
	chrec_contains_symbols_defined_in_loop): Remove the temporary
	hooks.
	* tree-flow-inline.h (loop_containing_stmt): New function.
	* tree-scalar-evolution.c: Add implementation.
	* tree-scalar-evolution.h: Add declarations.

From-SVN: r84573

	* tree-ssa-loop-im.c: New file.
	* Makefile.in (tree-ssa-loop-im.o): Add.
	* cfgloop.c (superloop_at_depth): New function.
	* cfgloop.h (superloop_at_depth): Declare.
	* common.opt (ftree-lim): New flag.
	* expr.c (array_ref_up_bound): New function.
	* params.def (PARAM_LIM_EXPENSIVE): New parameter.
	* timevar.def (TV_LIM): New timevar.
	* tree-dfa.c (compute_immediate_uses): Respect TDFA_USE flags when
	computing immediate uses of a phi node.
	* tree-flow.h (struct tree_ann_common_d): Add aux field.
	(loop_commit_inserts, for_each_index, tree_ssa_lim): Declare.
	* tree-optimize.c (init_tree_optimization_passes): Add pass_lim.
	* tree-pass.h (pass_lim): Declare.
	* tree-ssa-loop.c (tree_ssa_loop_im, gate_tree_ssa_loop_im): New
	functions.
	(pass_lim): New pass structure.
	* tree-eh.c (tree_could_trap_p): Handle ARRAY_REFs correctly.
	* tree.c (in_array_bounds_p): New function.
	* tree.h (TREE_THIS_NOTRAP): Define also for ARRAY_REFs.
	(in_array_bounds_p, array_ref_up_bound): Declare.
	* doc/invoke.texi (-ftree-lim, --param lim-expensive): Document.
	* doc/passes.texi (tree-ssa-loop-im.c): Document.

From-SVN: r84441

	* tree-scalar-evolution.c: New file.
	* tree-scalar-evolution.h: New file.
	* tree-ssa-loop-niter.c: New file.
	* Makefile.in (SCEV_H): New.
	(tree-scalar-evolution.o, tree-ssa-loop-niter.o): Add new files.
	* cfgloop.h (struct loop): Add bounds field.
	* tree-flow.h (struct tree_niter_desc): New type.
	(number_of_iterations_cond, number_of_iterations_exit,
	loop_niter_by_eval, find_loop_niter_by_eval,
	estimate_numbers_of_iterations, can_count_iv_in_wider_type,
	free_numbers_of_iterations_estimates): Declare.
	* tree.h (lower_bound_in_type, upper_bound_in_type): Declare.
	* params.def (PARAM_MAX_ITERATIONS_TO_TRACK): New parameter.
	* doc/invoke.texi (max-iterations-to-track): Document.

From-SVN: r84340

	* loop-invariant.c: New file.
	* Makefile.in (loop-invariant.o): New.
	* cfgloop.h (global_cost_for_size, init_set_costs,
	move_loop_invariants): Declare.
	* cfgloopanal.c (seq_cost, init_set_costs, global_cost_for_size): New
	functions.
	(avail_regs, res_regs, small_cost, pres_cost, spill_cost): New
	variables.
	* common.opt (floop-optimize2, fmove-loop-invariants): New options.
	* loop-init.c (loop_optimizer_init): Call init_set_costs.
	* passes.c (rest_of_handle_loop2): Call move_loop_invariants.
	(rest_of_compilation): Check flag_loop_optimize2.
	* toplev.c (process_options): Handle flag_loop_optimize2.
	* doc/invoke.texi (-floop-optimize2, -fmove-loop-invariants): Document.
	* doc/passes.texi (loop-invariant.c): Document.

From-SVN: r83419

2004-06-03  Jerry Quinn  <jlquinn@optonline.net>

	* Makefile.in (RA_H, RESOURCE_H, SCHED_INT_H, CFGLAYOUT_H,
	CFGLOOP_H, DF_H, DDG_H, TREE_SSA_LIVE_H): New.
	(TARGET_H): Add insn-modes.h.
	(tree-ssa.o, tree-cfg.o, tree-ssa-loop.o, toplev.o, passes.o,
	loop.o, loop-doloop.o, unroll.o, cfgloop.o, cfgloopanal.o,
	loop-iv.o, cfgloopmanip.o, loop-init.o, loop-unswitch.o,
	loop-unroll.o, ddg.o, modulo-sched.o, predict.o,
	cfglayout.o, ifcvt.o): Replace cfgloop.h with CFGLOOP_H.
	(toplev.o, passes.o, cfghooks.o, cfgloopmanip.o, loop-init.o,
	loop-unswitch.o, loop-unroll.o, ddg.o, modulo-sched.o,
	bb-reorder.o, tracer.o, cfglayout.o): Replace cfglayout.h with
	CFGLAYOUT_H.
	(ra.o, ra-build.o, ra-colorize.o, ra-debug.o, ra-rewrite.o):
	Replace ra.h with RA_H.
	(resource.o, regrename.o, insn-conditions.o, insn-emit.o,
	insn-recog.o): Replace resource.h with RESOURCE_H.
	(ddg.o, modulo-sched.o, haifa-sched.o, sched-deps.o, sched-rgn.o,
	sched-ebb.o, sched-vis.o, out_object_file):  Replace sched-int.h
	with SCHED_INT_H.
	(web.o, lcm.o, df.o, ra.o, ra-build.o, ra-colorize.o, ra-debug.o,
	ra-rewrite.o): Replace df.h with DF_H.
	(ddg.o, modulo-sched.o): Replace ddf.h with DDG_H.
	(tree-outof-ssa.o, tree-ssa-live.o, tree-ssa-copyrename.o):
	Replace tree-ssa-live.h with TREE_SSA_LIVE_H.
	(insn-conditions.o): Remove unused reload.h.
	* cfglayout.h: Add include guard.  Include basic-block.h.
	* cfgloop.h: Add include guard.  Include basic-block.h, rtl.h.
	* ddg.h: Include sbitmap.h, basic-block.h, df.h.
	* df.h: Add include guard.  Include bitmap.h, sbitmap.h,
	basic-block.h.
	* genconditions.c:  Remove reload.h.
	* ra.h: Add include guard.  Include bitmap.h, sbitmap.h,
	hard-reg-set.h, insn-modes.h.
	* resource.h: Add include guard.  Include hard-reg-set.h.
	* sched-int.h:  Add include guard.  Include insn-attr.h,
	basic-block.h, rtl.h.
	* target.h: Add include guard.  Include insn-modes.h.
	* tree-ssa-live.h: Include partition.h.

From-SVN: r82600

From-SVN: r81764

	* doloop.c: Removed.
	* loop-doloop.c: New file.
	* Makefile.in (doloop.o): Remove.
	(loop-doloop.o): New.
	* cfgloop.h (get_loop_level, doloop_optimize_loops): Declare.
	* cfgloopanal.c (get_loop_level): New function.
	* loop-iv.c (iv_number_of_iterations): Handle case when loop
	is leaved immediatelly.
	* loop.c (strength_reduce): Do not call doloop optimization.
	* loop.h (LOOP_BCT): Removed.
	* passes.c (rest_of_handle_loop_optimize): Do not use LOOP_BCT.
	(rest_of_handle_loop2): Call doloop_optimize_loops.
	(rest_of_compilation): Test for optimizations moved to
	rest_of_handle_loop2.

From-SVN: r79625

	* cfgloop.h (struct loop_desc): Removed.
	(struct loop): Fields simple, desc and has_desc removed.
	(simple_loop_p, count_loop_iterations): Declaration removed.
	* cfgloopanal.c (struct unmark_altered_insn_data): Removed.
	(unmark_altered, blocks_invariant_registers, unmark_altered_insn
	blocks_single_set_registers, invariant_rtx_wrto_regs_p_helper,
	invariant_rtx_wrto_regs_p, test_for_iteration, constant_iterations,
	simple_loop_exit_p, variable_initial_value, variable_initial_values,
	simple_condition_p, simple_increment, count_strange_loop_iterations,
	inverse, fits_in_mode_p, simple_loop_p, count_loop_iterations):
	Removed.
	* loop-iv.c (check_simple_exit, find_simple_exit): Update comments.

From-SVN: r78777

	* cfgloop.h, loop-iv.c, loop-unswitch.c: Replace iv_analyse
	with iv_analyze.

From-SVN: r78350

gcc/
	* cfgloop.h, cfgloopanal.c, cpplex.c, except.h, loop-init.c,
	loop-unroll.c, scan-decls.c, scan.h, stor-layout.c,
	xcoffout.c, xcoffout.h, config/arm/mmintrin.h,
	config/mips/linux64.h, config/pa/pa-64.h,
	config/rs6000/aix51.h, config/rs6000/aix52.h,
	config/rs6000/spe.md, config/sparc/linux.h,
	config/sparc/linux64.h: Update copyright.

gcc/cp/
	* cp-tree.def, cvt.c: Update copyright.

From-SVN: r78032

	* loop-iv.c: New file.
	* Makefile.in (loop-iv.o): New.
	* basic_block.h (FOR_BB_INSNS, FOR_BB_INSNS_REVERSE): New macros.
	* cfgloop.c (fill_sons_in_loop, get_loop_body_in_dom_order,
	num_loop_branches): New functions.
	* cfgloop.h (get_loop_body_in_dom_order, num_loop_branches,
	iv_analysis_loop_init, iv_get_reaching_def, iv_analyse, get_iv_value,
	find_simple_exit, iv_number_of_iterations, iv_analysis_done,
	get_simple_loop_desc, free_simple_loop_desc): Declare.
	(simple_loop_desc): New inline function.
	(struct rtx_iv, struct niter_desc): New.
	* cfgloopmanip.c (loopify): Specify semantics more precisely.
	* expr.c (force_operand): Handle subregs of expressions created by
	loop unroller.
	* loop-init.c (loop_optimizer_init, loop_optimizer_finalize): Move
	parts of the initialization to toplev.c
	* loop-unroll.c (loop_exit_at_end_p): New.
	(unroll_and_peel_loops): Call iv_analysis_done.
	(decide_peel_once_rolling, decide_peel_completely,
	decide_unroll_stupid, decide_unroll_constant_iterations,
	decide_unroll_runtime_iterations, decide_peel_simple,
	peel_loop_simple, unroll_loop_stupid, unroll_loop_constant_iterations,
	unroll_loop_runtime_iterations): Use new simple loop analysis.
	* loop-unswitch.c (compare_and_jump_seq): New.
	(may_unswitch_on_p): Renamed to ...
	(may_unswitch_on): Use new iv analysis.
	(reversed_condition): Export.
	(unswitch_single_loop, unswitch_loop): Use new iv analysis.
	* predict.c (estimate_probability): Use new simple loop analysis.
	* rtl.h (get_mode_bounds, reversed_condition,compare_and_jump_seq,
	canon_condition, simplify_using_condition): Declare.
	* stor-layout.c (get_mode_bounds): New.
	* toplev.c (rest_of_handle_loop2): Some parts of
	initialization/finalization moved here from loop-init.c.

From-SVN: r77951

	Backport from tree-ssa (relevant changes only):
	2003-12-18  Zdenek Dvorak  <rakdver@atrey.karlin.mff.cuni.cz>

	* et-forest.h (et_forest_create, et_forest_delete,
	et_forest_add_node, et_forest_add_edge, et_forest_remove_node,
	et_forest_remove_edge, et_forest_parent,
	et_forest_common_ancestor, et_forest_node_value,
	et_forest_enumerate_sons): Declarations removed.
	(struct et_node): New.
	(et_new_tree, et_free_tree, et_set_father, et_split, et_nca,
	et_below): Declare.
	* et-forest.c (struct et_forest_occurrence, struct et_forest,
	struct et_forest_node): Removed.
	(et_forest_create, et_forest_delete,
	et_forest_add_node, et_forest_add_edge, et_forest_remove_node,
	et_forest_remove_edge, et_forest_parent,
	et_forest_common_ancestor, et_forest_node_value,
	et_forest_enumerate_sons, splay, remove_all_occurrences,
	find_leftmost_node, find_rightmost_node, calculate_value): Removed.
	(struct et_occ): New.
	(et_nodes, et_occurences): New.
	(set_depth, set_depth_add, set_prev, set_next, et_recomp_min,
	et_check_occ_sanity, et_check_sanity, et_check_tree_sanity,
	record_path_before_1, record_path_before, check_path_after_1,
	check_path_after, et_splay, et_new_occ, et_new_tree,
	et_free_tree, et_set_father, et_split, et_nca, et_below): New.
	* basic-block.h (struct basic_block_def): New field dom.
	(struct dominance_info): Type removed.
	(calculate_dominance_info, free_dominance_info,
	nearest_common_dominator, set_immediate_dominator,
	get_immediate_dominator, dominated_by_p, get_dominated_by,
	add_to_dominance_info, delete_from_dominance_info,
	recount_dominator, redirect_immediate_dominators,
	iterate_fix_dominators, verify_dominators): Declarations
	changed.
	(enum dom_state): New.
	(dom_computed): New variable.
	(first_dom_son, next_dom_son): Declare.
	* dominance.c (struct dominance_info): Removed.
	(BB_NODE, SET_BB_NODE): Removed.
	(calculate_dominance_info, free_dominance_info,
	nearest_common_dominator, set_immediate_dominator,
	get_immediate_dominator, dominated_by_p, get_dominated_by,
	add_to_dominance_info, delete_from_dominance_info,
	recount_dominator, redirect_immediate_dominators,
	iterate_fix_dominators, verify_dominators,
	debug_dominance_info): Work over new datastructure.  Access
	dominance datastructures through CFG.
	(assign_dfs_numbers, compute_dom_fast_query, first_dom_son,
	next_dom_son): New.
	* bt-load.c (dom): Variable removed.
	(augment_live_range, combine_btr_defs, migrate_btr_def,
	migrate_btr_defs, branch_target_load_optimize): Updated for the
	new interface for dominance information.
	* cfg.c {exit_entry_blocks): Update initializer.
	* cfglayout.c (copy_bbs): Removed loops argument. Updated for
	the new interface for dominance information.
	* cfglayout.h (copy_bbs): Declaration changed.
	* cfgloop.c (flow_loop_pre_header_find, flow_loops_cfg_dump,
	flow_loop_scan, canonicalize_loop_headers, flow_loops_find): Updated
	for the new interface for dominance information.
	(flow_loop_scan): Loops argument removed.
	(flow_loops_free): Don't release dominators.
	* cfgloop.h (struct cfg): Dom field removed.
	(flow_loop_scan, loop_split_edge_with, simple_loop_p,
	just_once_each_iteration_p, split_loop_bb): Declaration changed.
	* cfgloopanal.c (simple_loop_exit_p, simple_increment,
	just_once_each_iteration_p, simple_loop_p): Remove loops argument.
	Updated for the new interface for dominance information.
	* cfgloopmanip.c (remove_bbs, find_path, create_preheader,
	split_loop_bb, loopify, duplicate_loop_to_header_edge,
	force_single_succ_latches, loop_split_edge_with): Ditto.
	* gcse.c (dominators): Variable removed.
	(free_code_hoist_mem, compute_code_hoist_data, hoist_code):
	Updated for the new interface for dominance information.
	* ifcvt.c (post_dominators): Variable removed.
	(mark_loop_exit_edges, merge_if_block, find_if_header,
	find_cond_trap, find_if_case_1, find_if_case_2, if_convert):
	Updated for the new interface for dominance information.
	* loop-init.c (rtl_loop_optimizer_init,
	rtl_loop_optimizer_finalize): Ditto.
	* loop-unroll.c (decide_peel_simple, decide_peel_once_rolling,
	decide_peel_completely, decide_unroll_stupid,
	decide_unroll_constant_iterations,
	decide_unroll_runtime_iterations): Loops argument removed.
	Updated for the new interface for dominance information.
	(unroll_and_peel_loops, peel_loops_completely,
	unroll_loop_runtime_iterations): Updated for the new interface for
	dominance information.
	* loop-unswitch.c (may_unswitch_on_p, unswitch_loops,
	unswitch_single_loop, unswitch_loop): Updated for the new
	interface for dominance information.
	* predict.c (process_note_predictions, process_note_prediction,
	estimate_probability, note_prediction_to_br_prob): Ditto.
	* sched-rgn.c (find_rgns, init_regions): Ditto.
	* toplev.c (rest_of_handle_branch_prob): Free the dominators.

From-SVN: r75226

cfgloopanal.c (variable_initial_value, [...]): Record the fact that initial value is extended from inner mode.

	* cfgloopanal.c (variable_initial_value, variable_initial_values,
	simple_loop_exit_p): Record the fact that initial value is extended
	from inner mode.
	(count_strange_loop_iterations, count_loop_iterations): Handle
	ivs that iterate in a narrower mode. Fix handling of overflows.
	Improve handling of NE conditions.
	(inverse, fits_in_mode_p): New static functions.
	(simple_increment): Detect variables that iterate in a narrower mode.
	* cfgloop.h (struct loop_desc): Fields inner_mode and extend added.

From-SVN: r73275

	* bt-load.c: Fix comment typos.
	* c-incpath.c: Likewise.
	* cfg.c: Likewise.
	* cfgcleanup.c: Likewise.
	* cfgloop.h: Likewise.
	* cfgloopmanip.c: Likewise.
	* cfgrtl.c: Likewise.
	* diagnostic.h: Likewise.
	* dwarfout.c: Likewise.
	* emit-rtl.c: Likewise.
	* et-forest.c: Likewise.
	* et-forest.h: Likewise.
	* expr.c: Likewise.
	* gcse.c: Likewise.
	* genattr.c: Likewise.
	* jump.c: Likewise.
	* langhooks.h: Likewise.
	* local-alloc.c: Likewise.
	* loop-unroll.c: Likewise.
	* loop-unswitch.c: Likewise.
	* ra-build.c: Likewise.
	* regclass.c: Likewise.
	* regmove.c: Likewise.
	* rtl.def: Likewise.
	* rtlanal.c: Likewise.
	* sched-ebb.c: Likewise.
	* sched-rgn.c: Likewise.
	* simplify-rtx.c: Likewise.
	* ssa.c: Likewise.
	* tracer.c: Likewise.
	* tree.c: Likewise.

From-SVN: r68975

	* basic-block.h (create_basic_block, merge_blocks_nomove): Kill.
	* cfgcleanup.c (merge_blocks): Rename to merge_blocks_move.
	(merge_blocks_move_predecessor_nojumps,
	 merge_blocks_move_successor_nojumps): Use merge_blocks.
	(try_optimize_cfg): Use merge_blocks_move.
	* cfgrtl.c (create_basic_block): Rename to rtl_create_basic_block.
	(merge_blocks_nomove): Rename to rtl_merge_blocks.
	(cfg_layout_create_basic_block): New.
	(rtl_can_merge_blocks): New.
	(cfg_layout_split_block): Do not alloc aux by hand.
	* cfghooks.h (cfg_hooks): Add create_basic_block, can_merge_blocks_p,
	merge_blocks.
	(create_basic_block, can_merge_blocks_p, merge_blocks): New macros.
	* cfglayout.c (cfg_layout_duplicate_bb): Do not allocate aux by hand.
	* cfgloopmanip.c (loop_split_edge_with): Likewise.
	* ifcvt.c (merge_if_block): Use merge_blocks_nomove.

	* basic-block.h (basic_block_def): Add field 'rbi'.
	* bb-reorder.c (find_traces, rotate_loop, mark_bb_visited,
	find_traces_1_round, copy_bb, connect_traces): Update use of rbi.
	* cfg.c (entry_exit_blocks): Add new field.
	* cfglayout.c: Include alloc-pool.h;
	(cfg_layout_pool): New.
	(record_effective_endpoints, fixup_reorder_chain,
	fixup_fallthru_exit_predecessor, cfg_layout_duplicate_bb): Update use
	of rbi.
	(cfg_layout_initialize_rbi): New function.
	(cfg_layout_initialize): Use it.
	(cfg_layout_finalize): Clear rbi fields.
	* cfglayout.h (RBI): Kill.
	(cfg_layout_initialize_rbi): Declare.
	* cfgloopmanip.c (copy_bbs): Use rbi.
	(record_exit_edges): Likewise.
	(duplicate_loop_to_header_edge): Likewise.
	* cfgrtl.c (cfg_layout_create_basic_block): Use
	cfg_layout_initialize_rbi.
	(cfg_layout_split_block): Use rbi.
	(cfg_layout_delete_block): Likewise.
	* loop-init.c (loop_optimizer_finalize): Likewise.
	* loop-unswitch.c (unswitch_loop): Likewise.
	* tracer.c (seen, tail_duplicate, layout_superblocks): Likewise.

	* cfgrtl.c: Update comments.
	(try_redirect_by_replacing_jump): New argument.
	(redirect_branch_edge): Break out from ...
	(rtl_redirect_edge_and_branch): ... this one.
	(update_cfg_after_block_merging): Break out from ...
	(rtl_merge_blocks): ... this one.
	(cfg_layout_split_edge): New.
	(cfg_layout_merge_blocks): New.
	(cfg_layout_can_merge_blocks_p): New.
	(cfg_layout_redirect_edge_and_branch): Reorganize.
	(cfg_layout_rtl_cfg_hooks): Fill in.
	(cfg_layout_delete_block): Kill barriers.
	* cfganal.c (can_fallthru): Deal with exit blocks
	* cfglayout.c (cfg_layout_function_header): New function
	(record_effective_endpoints): Record function header.
	(fixup_reorder_chain): Fixup dead jumptables; place header

	* basic-block.h (CLEANUP_CFGLAYOUT): New flag.
	* bb-reorder.c (cfg_layout_initialize): Update call.
	* cfgcleanup.c (try_optimize_cfg): Supress optimizations of fallthru
	edges in cfglayout mode.
	* cfglayout.c (cleanup_unconditional_jumps): Kill.
	(cfg_layout_initialize): Kill agrument loops; use cfgcleanup.
	* cfglayout.h (cfg_layout_initialize): Update prototype.
	* cfgloop.h (CP_INSIDE_CFGLAYOUT): Kill.
	* cfgloopmanip.c (loop_split_edge_with): Use split_edge.
	* flow.c (propagate_block): Do not crash when basic block ends
	by first insn in the chain.
	* loop-init.c (loop_optimizer_init):  First enter cfglayout mode; later
	do loop discovery.
	* tracer.c (tracer): Update call of cfg_layout_initialize.

From-SVN: r68899

	* caller-save.c: Convert to ISO C90.
	* calls.c: Likewise.
	* cfg.c: Likewise.
	* cfganal.c: Likewise.
	* cfgbuild.c: Likewise.
	* cfgcleanup.c: Likewise.
	* cfghooks.c: Likewise.
	* cfglayout.c: Likewise.
	* cfglayout.h: Likewise.
	* cfgloop.c: Likewise.
	* cfgloop.h: Likewise.
	* cfgloopanal.c: Likewise.
	* cfgloopmainip.c: Likewise.
	* cfgrtl.c: Likewise.

From-SVN: r68331

	* ChangeLog: Follow spelling conventions.
	* ChangeLog.2: Likewise.
	* c-decl.c: Likewise.
	* cfgloop.h: Likewise.
	* cgraph.c: Likewise.
	* coverage.c: Likewise.
	* cppcharset.c: Likewise.
	* cpphash.h: Likewise.
	* cpplex.c: Likewise.
	* cpplib.c: Likewise.
	* dbxout.c: Likewise.
	* df.c: Likewise.
	* dwarf2out.c: Likewise.
	* dwarfout.c: Likewise.
	* emit-rtl.c: Likewise.
	* explow.c: Likewise.
	* gcov-io.c: Likewise.
	* gcov-io.h: Likewise.
	* gcov.c: Likewise.
	* gengtype.c: Likewise.
	* ggc.h: Likewise.
	* opts.c: Likewise.
	* real.c: Likewise.
	* reload.c: Likewise.
	* stmt.c: Likewise.

From-SVN: r67849

	* 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

	* cse.c (count_reg_usage): Fix handling of REG_EQUAL notes.

	* Makefile.in (loop-unroll.o): New.
	* cfgloop.h (UAP_PEEL, UAP_UNROLL, UAP_UNROLL_ALL): New.
	(unroll_and_peel_loops): Declare.
	* alias.c (init_alias_analysis): Flag_unroll_loops renamed to
	flag_old_unroll_loops.
	* loop.c (loop_invariant_p): Ditto.
	* unroll.c (unroll_loop): Flag_unroll_all_loops renamed to
	flag_old_unroll_all_loops.
	* flags.h (flag_unroll_loops): Renamed to flag_old_unroll_loops.
	(flag_unroll_all_loops): Renamed to flag_old_unroll_all_loops.
	* params.def (PARAM_MAX_UNROLLED_INSNS): Default value changed.
	(PARAM_MAX_AVERAGE_UNROLLED_INSNS, PARAM_MAX_UNROLL_TIMES,
	PARAM_MAX_PEELED_INSNS, PARAM_MAX_PEEL_TIMES,
	PARAM_MAX_COMPLETELY_PEELED_INSNS, PARAM_MAX_COMPLETELY_PEEL_TIMES,
	PARAM_MAX_ONCE_PEELED_INSNS): New.
	* toplev.h (flag_old_unroll_loops, flag_old_unroll_all_loops): New.
	(flag_unroll_loops, flag_unroll_all_loops): Used for new unroller
	instead of old one.
	(flag_peel_loops): New.
	(lang_independent_options): The new flags added.
	(rest_of_compilation): Call new unroller.
	(process_options): Setup flags for coexistence of old and new unroller.
	* doc/invoke.texi: Document new options.
	* doc/passes.texi: Document new unroller pass.

From-SVN: r63462

	* 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