2009-04-03 Richard Guenther <rguenther@suse.de>

	PR middle-end/13146
	PR tree-optimization/23940
	PR tree-optimization/33237
	PR middle-end/33974
	PR middle-end/34093
	PR tree-optimization/36201
	PR tree-optimization/36230
	PR tree-optimization/38049
	PR tree-optimization/38207
	PR tree-optimization/38230
	PR tree-optimization/38301
	PR tree-optimization/38585
	PR middle-end/38895
	PR tree-optimization/38985
	PR tree-optimization/39299
	* tree-ssa-structalias.h: Remove.
	* tree-ssa-operands.h (NULL_USE_OPERAND_P): Make of type use_operand_p.
	(NULL_DEF_OPERAND_P): Make of type def_operand_p.
	(struct vuse_element_d): Remove.
	(struct vuse_vec_d): Likewise.
	(VUSE_VECT_NUM_ELEM, VUSE_VECT_ELEMENT_NC, VUSE_ELEMENT_PTR_NC,
	VUSE_ELEMENT_VAR_NC, VUSE_VECT_ELEMENT, VUSE_ELEMENT_PTR,
	SET_VUSE_VECT_ELEMENT, SET_VUSE_ELEMENT_VAR, SET_VUSE_ELEMENT_PTR,
	VUSE_ELEMENT_VAR): Likewise.
	(struct voptype_d): Likewise.
	(NUM_VOP_FREE_BUCKETS): Likewise.
	(struct ssa_operands): Remove vop_free_buckets and mpt_table fields.
	(struct stmt_operands_d): Remove.
	(VUSE_OP_PTR, VUSE_OP, SET_VUSE_OP, VUSE_NUM, VUSE_VECT,
	VDEF_RESULT_PTR, VDEF_RESULT, VDEF_OP_PTR, VDEF_OP, SET_VDEF_OP,
	VDEF_NUM, VDEF_VECT): Likewise.
	(copy_virtual_operands): Remove.
	(operand_build_cmp): Likewise.
	(create_ssa_artificial_load_stmt): Likewise.
	(enum ssa_op_iter_type): Remove ssa_op_iter_vdef.
	(struct ssa_operand_iterator_d): Remove vuses, vdefs, mayusesm
	vuse_index and mayuse_index members.  Pack and move done and iter_type
	members to the front.
	(SSA_OP_VMAYUSE): Remove.
	(SSA_OP_VIRTUAL_USES): Adjust.
	(FOR_EACH_SSA_VDEF_OPERAND): Remove.
	(unlink_stmt_vdef): Declare.
	(add_to_addressable_set): Remove.
	* tree-vrp.c (stmt_interesting_for_vrp): Adjust.
	(vrp_visit_stmt): Likewise.
	* doc/tree-ssa.texi (Alias analysis): Update.
	* doc/invoke.texi (max-aliased-vops): Remove docs.
	(avg-aliased-vops): Likewise.
	* tree-into-ssa.c (syms_to_rename): Remove.
	(need_to_update_vops_p): Likewise.
	(need_to_initialize_update_ssa_p): Rename to ...
	(update_ssa_initialized_fn): ... this.  Track function we are
	initialized for.
	(symbol_marked_for_renaming): Simplify.
	(add_new_name_mapping): Do not set need_to_update_vops_p.
	(dump_currdefs): Use SYMS_TO_RENAME.
	(rewrite_update_stmt): Always walk all uses/defs.
	(dump_update_ssa): Adjust.
	(init_update_ssa): Take function argument.  Track what we are
	initialized for.
	(delete_update_ssa): Reset SYMS_TO_RENAME and update_ssa_initialized_fn.
	(create_new_def_for): Initialize for cfun, assert we are initialized
	for cfun.
	(mark_sym_for_renaming): Simplify.
	(mark_set_for_renaming): Do not initialize update-ssa.
	(need_ssa_update_p): Simplify.  Take function argument.
	(name_mappings_registered_p): Assert we ask for the correct function.
	(name_registered_for_update_p): Likewise.
	(ssa_names_to_replace): Likewise.
	(release_ssa_name_after_update_ssa): Likewise.
	(update_ssa): Likewise.  Use SYMS_TO_RENAME.
	(dump_decl_set): Do not print a newline.
	(debug_decl_set): Do it here.
	(dump_update_ssa): And here.
	* tree-ssa-loop-im.c (move_computations): Adjust.
	(movement_possibility): Likewise.
	(determine_max_movement): Likewise.
	(gather_mem_refs_stmt): Likewise.
	* tree-dump.c (dequeue_and_dump): Do not handle SYMBOL_MEMORY_TAG
	or NAME_MEMORY_TAG.
	* tree-complex.c (update_all_vops): Remove.
	(expand_complex_move): Adjust.
	* tree-ssa-loop-niter.c (chain_of_csts_start): Use NULL_TREE.
	Simplify test for memory referencing statement.  Exclude
	non-invariant ADDR_EXPRs.
	* tree-pretty-print.c (dump_generic_node): Do not handle memory tags.
	* tree-loop-distribution.c (generate_memset_zero): Adjust.
	(rdg_flag_uses): Likewise.
	* tree-tailcall.c (suitable_for_tail_opt_p): Remove memory-tag
	related code.
	(tree_optimize_tail_calls_1): Also split the
	edge from the entry block if we have degenerate PHI nodes in
	the first basic block.
	* tree.c (init_ttree): Remove memory-tag related code.
	(tree_code_size): Likewise.
	(tree_node_structure): Likewise.
	(build7_stat): Re-write to be build6_stat.
	* tree.h (MTAG_P, TREE_MEMORY_TAG_CHECK, TMR_TAG): Remove.
	(SSA_VAR_P): Adjust.
	(struct tree_memory_tag): Remove.
	(struct tree_memory_partition_tag): Likewise.
	(union tree_node): Adjust.
	(build7): Re-write to be build6.
	* tree-pass.h (pass_reset_cc_flags): Remove.
	(TODO_update_address_taken): New flag.
	(pass_simple_dse): Remove.
	* ipa-cp.c (ipcp_update_callgraph): Update SSA form.
	* params.h (MAX_ALIASED_VOPS): Remove.
	(AVG_ALIASED_VOPS): Likewise.
	* omp-low.c (expand_omp_taskreg): Update SSA form.
	* tree-ssa-dse.c (dse_optimize_stmt): Properly query if the rhs
	aliases the lhs in a copy stmt.
	* tree-ssa-dse.c (struct address_walk_data): Remove.
	(memory_ssa_name_same): Likewise.
	(memory_address_same): Likewise.
	(get_kill_of_stmt_lhs): Likewise.
	(dse_possible_dead_store_p): Simplify, use the oracle.  Handle
	unused stores.  Look through PHI nodes into post-dominated regions.
	(dse_optimize_stmt): Simplify.  Properly remove stores.
	(tree_ssa_dse): Compute dominators.
	(execute_simple_dse): Remove.
	(pass_simple_dse): Likewise.
	* ipa-reference.c (scan_stmt_for_static_refs): Open-code
	gimple_loaded_syms and gimple_stored_syms computation.
	* toplev.c (dump_memory_report): Dump alias and pta stats.
	* tree-ssa-sccvn.c (vn_reference_compute_hash): Simplify.
	(vn_reference_eq): Likewise.
	(vuses_to_vec, copy_vuses_from_stmt, vdefs_to_vec,
	copy_vdefs_from_stmt, shared_lookup_vops, shared_vuses_from_stmt,
	valueize_vuses): Remove.
	(get_def_ref_stmt_vuses): Simplify.  Rename to ...
	(get_def_ref_stmt_vuse): ... this.
	(vn_reference_lookup_2): New function.
	(vn_reference_lookup_pieces): Use walk_non_aliased_vuses for
	walking equivalent vuses.  Simplify.
	(vn_reference_lookup): Likewise.
	(vn_reference_insert): Likewise.
	(vn_reference_insert_pieces): Likewise.
	(visit_reference_op_call): Simplify.
	(visit_reference_op_load): Likewise.
	(visit_reference_op_store): Likewise.
	(init_scc_vn): Remove shared_lookup_vuses initialization.
	(free_scc_vn): Remove shared_lookup_vuses freeing.
	(sort_vuses, sort_vuses_heap): Remove.
	(get_ref_from_reference_ops): Export.
	* tree-ssa-sccvn.h (struct vn_reference_s): Replace vuses
	vector with single vuse pointer.
	(vn_reference_lookup_pieces, vn_reference_lookup,
	vn_reference_insert, vn_reference_insert_pieces): Adjust prototypes.
	(shared_vuses_from_stmt): Remove.
	(get_ref_from_reference_ops): Declare.
	* tree-ssa-loop-manip.c (slpeel_can_duplicate_loop_p): Adjust.
	* tree-ssa-copyrename.c (copy_rename_partition_coalesce): Remove
	memory-tag related code.
	* tree-ssa-ccp.c (get_symbol_constant_value): Remove memory-tag code.
	(likely_value): Add comment, skip static-chain of call statements.
	(surely_varying_stmt_p): Adjust.
	(gimplify_and_update_call_from_tree): Likewise.
	(execute_fold_all_builtins): Do not rebuild alias info.
	(gimplify_and_update_call_from_tree): Properly update VOPs.
	* tree-ssa-loop-ivopts.c (get_ref_tag): Remove.
	(copy_ref_info): Remove memory-tag related code.
	* tree-call-cdce.c (tree_call_cdce): Rename the VOP.
	* ipa-pure-const.c (check_decl): Remove memory-tag related code.
	(check_stmt): Open-code gimple_loaded_syms and gimple_stored_syms
	computation.
	* tree-ssa-dom.c (gimple_p): Remove typedef.
	(eliminate_redundant_computations): Adjust.
	(record_equivalences_from_stmt): Likewise.
	(avail_expr_hash): Likewise.
	(avail_expr_eq): Likewise.
	* tree-ssa-propagate.c (update_call_from_tree): Properly
	update VOPs.
	(stmt_makes_single_load): Likewise.
	(stmt_makes_single_store): Likewise.
	* tree-ssa-alias.c: Rewrite completely.
	(debug_memory_partitions, dump_mem_ref_stats, debug_mem_ref_stats,
	debug_mem_sym_stats, dump_mem_sym_stats_for_var,
	debug_all_mem_sym_stats, debug_mp_info, update_mem_sym_stats_from_stmt,
	delete_mem_ref_stats, create_tag_raw, dump_points_to_info,
	dump_may_aliases_for, debug_may_aliases_for, new_type_alias):
	Remove public functions.
	(pass_reset_cc_flags): Remove.
	(pass_build_alias): Move ...
	* tree-ssa-structalias.c (pass_build_alias): ... here.
	* tree-ssa-alias.c (may_be_aliased): Move ...
	* tree-flow-inline.h (may_be_aliased): ... here.
	tree-ssa-alias.c (struct count_ptr_d, count_ptr_derefs,
	count_uses_and_derefs): Move ...
	* gimple.c: ... here.
	* gimple.h (count_uses_and_derefs): Declare.
	* tree-ssa-alias.c (dump_alias_stats, ptr_deref_may_alias_global_p,
	ptr_deref_may_alias_decl_p, ptr_derefs_may_alias_p,
	same_type_for_tbaa, nonaliasing_component_refs_p, decl_refs_may_alias_p,
	indirect_ref_may_alias_decl_p, indirect_refs_may_alias_p,
	ref_maybe_used_by_call_p, ref_maybe_used_by_stmt_p,
	call_may_clobber_ref_p, stmt_may_clobber_ref_p, maybe_skip_until,
	get_continuation_for_phi, walk_non_aliased_vuses, walk_aliased_vdefs):
	New functions.
	* tree-dfa.c (refs_may_alias_p): Move ...
	* tree-ssa-alias.c (refs_may_alias_p): ... here.  Extend.
	* tree-ssa-alias.h: New file.
	* tree-ssa-sink.c (is_hidden_global_store): Adjust.
	(statement_sink_location): Likewise.
	* opts.c (decode_options): Do not adjust max-aliased-vops or
	avg-aliased-vops values.
	* timevar.def (TV_TREE_MAY_ALIAS): Remove.
	(TV_CALL_CLOBBER): Likewise.
	(TV_FLOW_SENSITIVE): Likewise.
	(TV_FLOW_INSENSITIVE): Likewise.
	(TV_MEMORY_PARTITIONING): Likewise.
	(TV_ALIAS_STMT_WALK): New timevar.
	* tree-ssa-loop-ivcanon.c (empty_loop_p): Adjust.
	* tree-ssa-address.c (create_mem_ref_raw): Use build6.
	(get_address_description): Remove memory-tag related code.
	* tree-ssa-ifcombine.c (bb_no_side_effects_p): Adjust.
	* treestruct.def (TS_MEMORY_TAG, TS_MEMORY_PARTITION_TAG): Remove.
	* tree-eh.c (cleanup_empty_eh): Do not leave stale SSA_NAMEs
	and immediate uses in statements.  Document.
	* gimple-pretty-print.c (dump_gimple_mem_ops): Adjust.
	(dump_symbols): Remove.
	(dump_gimple_mem_ops): Do not dump loaded or stored syms.
	* alias.c (get_deref_alias_set): New function split out from ...
	(get_alias_set): ... here.
	* alias.h (get_deref_alias_set): Declare.
	* tree-vect-data-refs.c (vect_create_data_ref_ptr): Remove unused
	type parameter.  Remove restrict pointer handling.  Create a
	ref-all pointer in case type-based alias sets do not conflict.
	(vect_analyze_data_refs): Remove SMT related code.
	* tree-vect-stmts.c (vectorizable_store): Re-instantiate TBAA assert.
	(vectorizable_load): Likewise.
	* tree-data-ref.h (struct dr_alias): Remove symbol_tag field.
	(DR_SYMBOL_TAG, DR_VOPS): Remove.
	* tree-data-ref.c (dr_may_alias_p): Use the alias-oracle.
	Ignore vops and SMTs.
	(dr_analyze_alias): Likewise..
	(free_data_ref): Likewise.
	(create_data_ref): Likewise.
	(analyze_all_data_dependences): Likewise.
	(get_references_in_stmt): Adjust.
	* tree-flow-inline.h (gimple_aliases_computed_p,
	gimple_addressable_vars, gimple_call_clobbered_vars,
	gimple_call_used_vars, gimple_global_var, may_aliases, memory_partition,
	factoring_name_p, mark_call_clobbered, clear_call_clobbered,
	compare_ssa_operands_equal, symbol_mem_tag, set_symbol_mem_tag,
	gimple_mem_ref_stats): Remove.
	(gimple_vop): New function.
	(op_iter_next_use): Remove vuses and mayuses cases.
	(op_iter_next_def): Remove vdefs case.
	(op_iter_next_tree): Remove vuses, mayuses and vdefs cases.
	(clear_and_done_ssa_iter): Do not set removed fields.
	(op_iter_init): Likewise.  Skip vuse and/or vdef if requested.
	Assert we are not iterating over vuses or vdefs if not also
	iterating over uses or defs.
	(op_iter_init_use): Likewise.
	(op_iter_init_def): Likewise.
	(op_iter_next_vdef): Remove.
	(op_iter_next_mustdef): Likewise.
	(op_iter_init_vdef): Likewise.
	(compare_ssa_operands_equal): Likewise.
	(link_use_stmts_after): Handle vuse operand.
	(is_call_used): Use is_call_clobbered.
	(is_call_clobbered): Global variables are always call clobbered,
	query the call-clobbers bitmap.
	(mark_call_clobbered): Ignore global variables.
	(clear_call_clobbered): Likewise.
	* tree-ssa-coalesce.c (create_outofssa_var_map): Adjust
	virtual operands sanity check.
	* tree.def (NAME_MEMORY_TAG, SYMBOL_MEMORY_TAG, MEMORY_PARTITION_TAG):
	Remove.
	(TARGET_MEM_REF): Remove TMR_TAG operand.
	* tree-dfa.c (add_referenced_var): Initialize call-clobber state.
	Remove call-clobber related code.
	(remove_referenced_var): Likewise.  Do not clear mpt or symbol_mem_tag.
	(dump_variable): Do not dump SMTs, memory stats, may-aliases or
	partitions or escape reason.
	(get_single_def_stmt, get_single_def_stmt_from_phi,
	get_single_def_stmt_with_phi): Remove.
	(dump_referenced_vars): Tidy.
	(get_ref_base_and_extent): Allow bare decls.
	(collect_dfa_stats): Adjust.
	* graphite.c (rename_variables_in_stmt): Adjust.
	(graphite_copy_stmts_from_block): Likewise.
	(translate_clast): Likewise.
	* tree-ssa-pre.c (struct bb_bitmap_sets): Add expr_dies bitmap.
	(EXPR_DIES): New.
	(translate_vuse_through_block): Use the oracle.
	(phi_translate_1): Adjust.
	(value_dies_in_block_x): Use the oracle.  Cache the outcome
	in EXPR_DIES.
	(valid_in_sets): Check if the VUSE for
	a REFERENCE is available.
	(eliminate): Do not remove stmts during elimination,
	instead queue and remove them afterwards.
	(do_pre): Do not rebuild alias info.
	(pass_pre): Run TODO_rebuild_alias before PRE.
	* tree-ssa-live.c (remove_unused_locals): Remove memory-tag code.
	* tree-sra.c (sra_walk_function): Use gimple_references_memory_p.
	(mark_all_v_defs_stmt): Remove.
	(mark_all_v_defs_seq): Adjust.
	(sra_replace): Likewise.
	(scalarize_use): Likewise.
	(scalarize_copy): Likewise.
	(scalarize_init): Likewise.
	(scalarize_ldst): Likewise.
	(todoflags): Remove.
	(tree_sra): Do not rebuild alias info.
	(tree_sra_early): Adjust.
	(pass_sra): Run TODO_update_address_taken before SRA.
	* tree-predcom.c (set_alias_info): Remove.
	(prepare_initializers_chain): Do not call it.
	(mark_virtual_ops_for_renaming): Adjust.
	(mark_virtual_ops_for_renaming_list): Remove.
	(initialize_root_vars): Adjust.
	(initialize_root_vars_lm): Likewise.
	(prepare_initializers_chain): Likewise.
	* tree-ssa-copy.c (may_propagate_copy): Remove memory-tag related code.
	(may_propagate_copy_into_stmt): Likewise.
	(merge_alias_info): Do nothing for now.
	(propagate_tree_value_into_stmt): Adjust.
	(stmt_may_generate_copy): Likewise.
	* tree-ssa-forwprop.c (tidy_after_forward_propagate_addr): Do
	not mark symbols for renaming.
	(forward_propagate_addr_expr): Match up push/pop_stmt_changes
	with the same statement, make sure to update the new pointed-to one.
	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Do not copy
	call statements, do not mark symbols for renaming.
	(mark_operand_necessary): Dump something.
	(ref_may_be_aliased): New function.
	(mark_aliased_reaching_defs_necessary_1): New helper function.
	(mark_aliased_reaching_defs_necessary): Likewise.
	(mark_all_reaching_defs_necessary_1): Likewise.
	(mark_all_reaching_defs_necessary): Likewise.
	(propagate_necessity): Do not process virtual PHIs.  For
	non-aliased loads mark all reaching definitions as necessary.
	For aliased loads and stores mark the immediate dominating
	aliased clobbers as necessary.
	(visited): New global static.
	(perform_tree_ssa_dce): Free visited bitmap after propagating
	necessity.
	(remove_dead_phis): Perform simple dead virtual PHI removal.
	(remove_dead_stmt): Properly unlink virtual operands when
	removing stores.
	(eliminate_unnecessary_stmts): Schedule PHI removal after
	stmt removal.
	* tree-ssa-ter.c (is_replaceable_p): Adjust.
	(process_replaceable): Likewise.
	(find_replaceable_in_bb): Likewise.
	* tree-ssa.c (verify_ssa_name): Verify all VOPs are
	based on the single gimple vop.
	(verify_flow_insensitive_alias_info): Remove.
	(verify_flow_sensitive_alias_info): Likewise.
	(verify_call_clobbering): Likewise.
	(verify_memory_partitions): Likewise.
	(verify_alias_info): Likewise.
	(verify_ssa): Adjust..
	(execute_update_addresses_taken): Export.  Update SSA
	manually.  Optimize only when optimizing.  Use a local bitmap.
	(pass_update_address_taken): Remove TODO_update_ssa, add
	TODO_dump_func.
	(pass_update_address_taken): Just use TODO_update_address_taken.
	(init_tree_ssa): Do not initialize addressable_vars.
	(verify_ssa): Verify new VUSE / VDEF properties.
	Verify that all stmts definitions have the stmt as SSA_NAME_DEF_STMT.
	Do not call verify_alias_info.
	(delete_tree_ssa): Clear the VUSE, VDEF operands.
	Do not free the loaded and stored syms bitmaps.  Reset the escaped
	and callused solutions.  Do not free addressable_vars.
	Remove memory-tag related code.
	(warn_uninitialized_var): Aliases are always available.
	* tree-ssa-loop-prefetch.c (gather_memory_references): Adjust.
	* lambda-code.c (can_put_in_inner_loop): Adjust.
	(can_put_after_inner_loop): Likewise.
	(perfect_nestify): Likewise.
	* tree-vect-stmts.c (vect_stmt_relevant_p): Adjust.
	(vect_gen_widened_results_half): Remove CALL_EXPR handling.
	(vectorizable_conversion): Do not mark symbols for renaming.
	* tree-inline.c (remap_gimple_stmt): Clear VUSE/VDEF.
	(expand_call_inline): Unlink the calls virtual operands before
	replacing it.
	(tree_function_versioning): Do not call update_ssa if we are not
	updating clones.  Simplify.
	* tree-ssa-phiprop.c (phivn_valid_p): Adjust.
	(propagate_with_phi): Likewise..
	* tree-outof-ssa.c (create_temp): Remove memory tag and call
	clobber code.  Assert we are not aliased or global.
	* tree-flow.h: Include tree-ssa-alias.h
	(enum escape_type): Remove.
	(struct mem_sym_stats_d): Likewise.
	(struct mem_ref_stats_d): Likewise.
	(struct gimple_df): Add vop member.  Remove global_var,
	call_clobbered_vars, call_used_vars, addressable_vars,
	aliases_compted_p and mem_ref_stats members.  Add syms_to_rename,
	escaped and callused members.
	(struct ptr_info_def): Remove all members, add points-to solution
	member pt.
	(struct var_ann_d): Remove in_vuse_list, in_vdef_list,
	call_clobbered, escape_mask, mpt and symbol_mem_tag members.
	* Makefile.in (TREE_FLOW_H): Add tree-ssa-alias.h.
	(tree-ssa-structalias.o): Remove tree-ssa-structalias.h.
	(tree-ssa-alias.o): Likewise.
	(toplev.o): Add tree-ssa-alias.h
	(GTFILES): Remove tree-ssa-structalias.h, add tree-ssa-alias.h.
	* gimple.c (gimple_set_bb): Fix off-by-one error.
	(is_gimple_reg): Do not handle memory tags.
	(gimple_copy): Also copy virtual operands.
	Delay updating the statement.  Do not reset loaded and stored syms.
	(gimple_set_stored_syms): Remove.
	(gimple_set_loaded_syms): Likewise.
	(gimple_call_copy_skip_args): Copy the virtual operands
	and mark the new statement modified.
	* tree-ssa-structalias.c (may_alias_p): Remove.
	(set_uids_in_ptset): Take the alias set to prune with as
	parameter.  Fold in the alias test of may_alias_p.
	(compute_points_to_sets): Compute whether a ptr is dereferenced
	in a local sbitmap.
	(process_constraint): Deal with &ANYTHING on the lhs, reject all
	other ADDRESSOF constraints on the lhs.
	(get_constraint_for_component_ref): Assert that we don't get
	ADDRESSOF constraints from the base of the reference.
	Properly generate UNKNOWN_OFFSET for DEREF if needed.
	(struct variable_info): Remove collapsed_to member.
	(get_varinfo_fc): Remove.
	(new_var_info): Do not set collapsed_to.
	(dump_constraint): Do not follow cycles.
	(dump_constraint_graph): Likewise.
	(build_pred_graph): Likewise.
	(build_succ_graph): Likewise.
	(rewrite_constraints): Likewise.
	(do_simple_structure_copy): Remove.
	(do_rhs_deref_structure_copy): Remove.
	(do_lhs_deref_structure_copy): Remove.
	(collapse_rest_of_var): Remove.
	(do_structure_copy): Re-implement.
	(pta_stats): New global variable.
	(dump_pta_stats): New function.
	(struct constraint_expr): Make offset signed.
	(UNKNOWN_OFFSET): Define special value.
	(dump_constraint): Dump UNKNOWN_OFFSET as UNKNOWN.
	(solution_set_expand): New helper function split out from ...
	(do_sd_constraint): ... here.
	(solution_set_add): Handle UNKNOWN_OFFSET.  Handle negative offsets.
	(do_ds_constraint): Likewise.
	(do_sd_constraint): Likewise.  Do not special-case ESCAPED = *ESCAPED
	and CALLUSED = *CALLUSED.
	(set_union_with_increment): Make inc argument signed.
	(type_safe): Remove.
	(get_constraint_for_ptr_offset): Handle unknown and negative
	constant offsets.
	(first_vi_for_offset): Handle offsets before start.  Bail
	out early for offsets beyond the variable extent.
	(first_or_preceding_vi_for_offset): New function.
	(init_base_vars): Add ESCAPED = ESCAPED + UNKNOWN_OFFSET constraint.
	Together with ESCAPED = *ESCAPED this properly computes reachability.
	(find_what_var_points_to): New function.
	(find_what_p_points_to): Implement in terms of find_what_var_points_to.
	(pt_solution_reset, pt_solution_empty_p, pt_solution_includes_global,
	pt_solution_includes_1, pt_solution_includes, pt_solutions_intersect_1,
	pt_solutions_intersect): New functions.
	(compute_call_used_vars): Remove.
	(compute_may_aliases): New main entry into PTA computation.
	* gimple.h (gimple_p): New typedef.
	(struct gimple_statement_base): Remove references_memory_p.
	(struct gimple_statement_with_memory_ops_base): Remove
	vdef_ops, vuse_ops, stores and loads members.  Add vdef and vuse
	members.
	(gimple_vuse_ops, gimple_set_vuse_ops, gimple_vdef_ops,
	gimple_set_vdef_ops, gimple_loaded_syms, gimple_stored_syms,
	gimple_set_references_memory): Remove.
	(gimple_vuse_op, gimple_vdef_op, gimple_vuse, gimple_vdef,
	gimple_vuse_ptr, gimple_vdef_ptri, gimple_set_vuse, gimple_set_vdef):
	New functions.
	* tree-cfg.c (move_block_to_fn): Fix off-by-one error.
	(verify_expr): Allow RESULT_DECL.
	(gimple_duplicate_bb): Do not copy virtual operands.
	(gimple_duplicate_sese_region): Adjust.
	(gimple_duplicate_sese_tail): Likewise.
	(mark_virtual_ops_in_region): Remove.
	(move_sese_region_to_fn): Do not call it.
	* passes.c (init_optimization_passes): Remove pass_reset_cc_flags
	and pass_simple_dse.
	(execute_function_todo): Handle TODO_update_address_taken,
	call execute_update_addresses_taken for TODO_rebuild_alias.
	(execute_todo): Adjust.
	(execute_one_pass): Init dump files early.
	* ipa-struct-reorg.c (finalize_var_creation): Do not mark vars
	call-clobbered.
	(create_general_new_stmt): Clear vops.
	* tree-ssa-reassoc.c (get_rank): Adjust.
	* tree-vect-slp.c (vect_create_mask_and_perm): Do not mark
	symbols for renaming.
	* params.def (PARAM_MAX_ALIASED_VOPS): Remove.
	(PARAM_AVG_ALIASED_VOPS): Likewise.
	* tree-ssanames.c (init_ssanames): Allocate SYMS_TO_RENAME.
	(duplicate_ssa_name_ptr_info): No need to copy the shared bitmaps.
	* tree-ssa-operands.c: Simplify for new virtual operand
	representation.
	(operand_build_cmp, copy_virtual_operands,
	create_ssa_artificial_load_stmt, add_to_addressable_set,
	gimple_add_to_addresses_taken): Remove public functions.
	(unlink_stmt_vdef): New function.

	* gcc.dg/pr19633-1.c: Adjust.
	* gcc.dg/torture/pta-callused-1.c: Likewise.
	* gcc.dg/torture/pr39074-2.c: Likewise.
	* gcc.dg/torture/pr39074.c: Likewise.
	* gcc.dg/torture/pta-ptrarith-3.c: New testcase.
	* gcc.dg/torture/pr30375.c: Adjust.
	* gcc.dg/torture/pr33563.c: Likewise.
	* gcc.dg/torture/pr33870.c: Likewise.
	* gcc.dg/torture/pr33560.c: Likewise.
	* gcc.dg/torture/pta-structcopy-1.c: New testcase.
	* gcc.dg/torture/ssa-pta-fn-1.c: Likewise.
	* gcc.dg/tree-ssa/alias-15.c: Remove.
	* gcc.dg/tree-ssa/ssa-dce-4.c: New testcase.
	* gcc.dg/tree-ssa/pr26421.c: Adjust.
	* gcc.dg/tree-ssa/ssa-fre-10.c: XFAIL.
	* gcc.dg/tree-ssa/ssa-dce-5.c: New testcase.
	* gcc.dg/tree-ssa/pr23382.c: Adjust.
	* gcc.dg/tree-ssa/ssa-fre-20.c: New testcase.
	* gcc.dg/tree-ssa/alias-16.c: Adjust.
	* gcc.dg/tree-ssa/ssa-fre-13.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-14.c: Likewise.
	* gcc.dg/tree-ssa/alias-18.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-15.c: Likewise.
	* gcc.dg/tree-ssa/ssa-lim-3.c: Likewise.
	* gcc.dg/tree-ssa/alias-19.c: Likewise.
	* gcc.dg/tree-ssa/pta-ptrarith-1.c: New testcase.
	* gcc.dg/tree-ssa/pr13146.c: Likewise.
	* gcc.dg/tree-ssa/ssa-pre-23.c: Likewise.
	* gcc.dg/tree-ssa/pta-ptrarith-2.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-18.c: Likewise.
	* gcc.dg/tree-ssa/ssa-pre-24.c: New XFAILed testcase.
	* gcc.dg/tree-ssa/ssa-fre-19.c: New testcase.
	* gcc.dg/tree-ssa/alias-20.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dse-12.c: Likewise.
	* gcc.dg/tree-ssa/pr38895.c: Likewise.
	* gcc.dg/uninit-B.c: XFAIL.
	* gcc.dg/vect/no-vfa-vect-43.c: Adjust.
	* gcc.dg/uninit-pr19430.c: XFAIL.
	* g++.dg/tree-ssa/pr13146.C: New testcase.
	* g++.dg/opt/pr36187.C: Adjust.
	* g++.dg/torture/20090329-1.C: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@145494 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 25 insertions, 226 deletions

diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h
index 868b762a85c..f2d7c5f7f93 100644
--- a/gcc/tree-flow.h
+++ b/gcc/tree-flow.h
@@ -30,6 +30,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-ssa-operands.h"
 #include "cgraph.h"
 #include "ipa-reference.h"
+#include "tree-ssa-alias.h"
 
 /* Forward declare structures for the garbage collector GTY markers.  */
 #ifndef GCC_BASIC_BLOCK_H
@@ -40,98 +41,6 @@ typedef struct basic_block_def *basic_block;
 #endif
 struct static_var_ann_d;
 
-/* The reasons a variable may escape a function.  */
-enum escape_type 
-{
-  NO_ESCAPE = 0,			/* Doesn't escape.  */
-  ESCAPE_STORED_IN_GLOBAL = 1 << 0,
-  ESCAPE_TO_ASM = 1 << 1,		/* Passed by address to an assembly
-					   statement.  */
-  ESCAPE_TO_CALL = 1 << 2,		/* Escapes to a function call.  */
-  ESCAPE_BAD_CAST = 1 << 3,		/* Cast from pointer to integer */
-  ESCAPE_TO_RETURN = 1 << 4,		/* Returned from function.  */
-  ESCAPE_TO_PURE_CONST = 1 << 5,	/* Escapes to a pure or constant
-					   function call.  */
-  ESCAPE_IS_GLOBAL = 1 << 6,		/* Is a global variable.  */
-  ESCAPE_IS_PARM = 1 << 7,		/* Is an incoming function argument.  */
-  ESCAPE_UNKNOWN = 1 << 8		/* We believe it escapes for
-					   some reason not enumerated
-					   above.  */
-};
-
-/* Memory reference statistics for individual memory symbols,
-   collected during alias analysis.  */
-struct mem_sym_stats_d GTY(())
-{
-  /* Memory symbol.  */
-  tree var;
-
-  /* Nonzero if this entry has been assigned a partition.  */
-  unsigned int partitioned_p : 1;
-
-  /* Nonzero if VAR is a memory partition tag that already contains
-     call-clobbered variables in its partition set.  */
-  unsigned int has_call_clobbered_vars : 1;
-
-  /* Number of direct reference sites.  A direct reference to VAR is any
-     reference of the form 'VAR = ' or ' = VAR'.  For GIMPLE reg
-     pointers, this is the number of sites where the pointer is
-     dereferenced.  */
-  long num_direct_writes;
-  long num_direct_reads;
-
-  /* Number of indirect reference sites.  An indirect reference to VAR
-     is any reference via a pointer that contains VAR in its points-to
-     set or, in the case of call-clobbered symbols, a function call.  */
-  long num_indirect_writes;
-  long num_indirect_reads;
-
-  /* Execution frequency.  This is the sum of the execution
-     frequencies of all the statements that reference this object
-     weighted by the number of references in each statement.  This is
-     the main key used to sort the list of symbols to partition.
-     Symbols with high execution frequencies are put at the bottom of
-     the work list (ie, they are partitioned last).
-     Execution frequencies are taken directly from each basic block,
-     so compiling with PGO enabled will increase the precision of this
-     estimate.  */
-  long frequency_reads;
-  long frequency_writes;
-
-  /* Set of memory tags that contain VAR in their alias set.  */
-  bitmap parent_tags;
-};
-
-typedef struct mem_sym_stats_d *mem_sym_stats_t;
-DEF_VEC_P(mem_sym_stats_t);
-DEF_VEC_ALLOC_P(mem_sym_stats_t, heap);
-
-/* Memory reference statistics collected during alias analysis.  */
-struct mem_ref_stats_d GTY(())
-{
-  /* Number of statements that make memory references.  */
-  long num_mem_stmts;
-
-  /* Number of statements that make function calls.  */
-  long num_call_sites;
-
-  /* Number of statements that make calls to pure/const functions.  */
-  long num_pure_const_call_sites;
-
-  /* Number of ASM statements.  */
-  long num_asm_sites;
-
-  /* Estimated number of virtual operands needed as computed by
-   compute_memory_partitions.  */
-  long num_vuses;
-  long num_vdefs;
-
-  /* This maps every symbol used to make "memory" references
-     (pointers, arrays, structures, etc) to an instance of struct
-     mem_sym_stats_d describing reference statistics for the symbol.  */
-  struct pointer_map_t * GTY((skip)) mem_sym_stats;
-};
-
 
 /* Gimple dataflow datastructure. All publicly available fields shall have
    gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable
@@ -151,29 +60,18 @@ struct gimple_df GTY(())
   /* Array of all SSA_NAMEs used in the function.  */
   VEC(tree,gc) *ssa_names;
 
-  /* Artificial variable used to model the effects of function calls.  */
-  tree global_var;
+  /* Artificial variable used for the virtual operand FUD chain.  */
+  tree vop;
 
   /* Artificial variable used to model the effects of nonlocal
      variables.  */
   tree nonlocal_all;
 
-  /* Call clobbered variables in the function.  If bit I is set, then
-     REFERENCED_VARS (I) is call-clobbered.  */
-  bitmap call_clobbered_vars;
-
-  /* Call-used variables in the function.  If bit I is set, then
-     REFERENCED_VARS (I) is call-used at pure function call-sites.  */
-  bitmap call_used_vars;
+  /* The PTA solution for the ESCAPED artificial variable.  */
+  struct pt_solution escaped;
 
-  /* Addressable variables in the function.  If bit I is set, then
-     REFERENCED_VARS (I) has had its address taken.  Note that
-     CALL_CLOBBERED_VARS and ADDRESSABLE_VARS are not related.  An
-     addressable variable is not necessarily call-clobbered (e.g., a
-     local addressable whose address does not escape) and not all
-     call-clobbered variables are addressable (e.g., a local static
-     variable).  */
-  bitmap addressable_vars;
+  /* The PTA solution for the CALLUSED artificial variable.  */
+  struct pt_solution callused;
 
   /* Free list of SSA_NAMEs.  */
   tree free_ssanames;
@@ -184,18 +82,14 @@ struct gimple_df GTY(())
      for this variable with an empty defining statement.  */
   htab_t GTY((param_is (union tree_node))) default_defs;
 
-  /* 'true' after aliases have been computed (see compute_may_aliases).  */
-  unsigned int aliases_computed_p : 1;
+  /* Symbols whose SSA form needs to be updated or created for the first
+     time.  */
+  bitmap syms_to_rename;
 
   /* True if the code is in ssa form.  */
   unsigned int in_ssa_p : 1;
 
   struct ssa_operands ssa_operands;
-
-  /* Memory reference statistics collected during alias analysis.
-     This information is used to drive the memory partitioning
-     heuristics in compute_memory_partitions.  */
-  struct mem_ref_stats_d mem_ref_stats;
 };
 
 /* Accessors for internal use only.  Generic code should use abstraction
@@ -204,6 +98,7 @@ struct gimple_df GTY(())
 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
+#define SYMS_TO_RENAME(fun) (fun)->gimple_df->syms_to_rename
 
 typedef struct
 {
@@ -231,37 +126,8 @@ typedef struct
 /* Aliasing information for SSA_NAMEs representing pointer variables.  */
 struct ptr_info_def GTY(())
 {
-  /* Mask of reasons this pointer's value escapes the function.  */
-  ENUM_BITFIELD (escape_type) escape_mask : 9;
-
-  /* Nonzero if points-to analysis couldn't determine where this pointer
-     is pointing to.  */
-  unsigned int pt_anything : 1;
-
-  /* Nonzero if the value of this pointer escapes the current function.  */
-  unsigned int value_escapes_p : 1;
-
-  /* Nonzero if a memory tag is needed for this pointer.  This is
-     true if this pointer is eventually dereferenced.  */
-  unsigned int memory_tag_needed : 1;
-
-  /* Nonzero if this pointer is really dereferenced.  */
-  unsigned int is_dereferenced : 1;
-
-  /* Nonzero if this pointer points to a global variable.  */
-  unsigned int pt_global_mem : 1;
-
-  /* Nonzero if this pointer points to NULL.  */
-  unsigned int pt_null : 1;
-
-  /* Set of variables that this pointer may point to.  */
-  bitmap pt_vars;
-
-  /* If this pointer has been dereferenced, and points-to information is
-     more precise than type-based aliasing, indirect references to this
-     pointer will be represented by this memory tag, instead of the type
-     tag computed by TBAA.  */
-  tree name_mem_tag;
+  /* The points-to solution, TBAA-pruned if the pointer is dereferenced.  */
+  struct pt_solution pt;
 };
 
 
@@ -359,42 +225,15 @@ struct var_ann_d GTY(())
      states.  */
   ENUM_BITFIELD (need_phi_state) need_phi_state : 2;
 
-  /* Used during operand processing to determine if this variable is already 
-     in the VUSE list.  */
-  unsigned in_vuse_list : 1;
-
-  /* Used during operand processing to determine if this variable is already 
-     in the VDEF list.  */
-  unsigned in_vdef_list : 1;
-
   /* True for HEAP artificial variables.  These variables represent
      the memory area allocated by a call to malloc.  */
   unsigned is_heapvar : 1;
 
-  /* True if the variable is call clobbered.  */
-  unsigned call_clobbered : 1;
-
   /* This field describes several "no alias" attributes that some
      symbols are known to have.  See the enum's definition for more
      information on each attribute.  */
   ENUM_BITFIELD (noalias_state) noalias_state : 2;
 
-  /* Mask of values saying the reasons why this variable has escaped
-     the function.  */
-  ENUM_BITFIELD (escape_type) escape_mask : 9;
-
-  /* Memory partition tag assigned to this symbol.  */
-  tree mpt;
-
-  /* If this variable is a pointer P that has been dereferenced, this
-     field is an artificial variable that represents the memory
-     location *P.  Every other pointer Q that is type-compatible with
-     P will also have the same memory tag.  If the variable is not a
-     pointer or if it is never dereferenced, this must be NULL.
-     FIXME, do we really need this here?  How much slower would it be
-     to convert to hash table?  */
-  tree symbol_mem_tag;
-
   /* Used when going out of SSA form to indicate which partition this
      variable represents storage for.  */
   unsigned partition;
@@ -535,7 +374,6 @@ static inline function_ann_t function_ann (const_tree);
 static inline function_ann_t get_function_ann (tree);
 static inline enum tree_ann_type ann_type (tree_ann_t);
 static inline void update_stmt (gimple);
-static inline bitmap may_aliases (const_tree);
 static inline int get_lineno (const_gimple);
 
 /*---------------------------------------------------------------------------
@@ -776,10 +614,8 @@ extern tree make_rename_temp (tree, const char *);
 extern void set_default_def (tree, tree);
 extern tree gimple_default_def (struct function *, tree);
 extern bool stmt_references_abnormal_ssa_name (gimple);
-extern bool refs_may_alias_p (tree, tree);
-extern gimple get_single_def_stmt (gimple);
-extern gimple get_single_def_stmt_from_phi (tree, gimple);
-extern gimple get_single_def_stmt_with_phi (tree, gimple);
+extern tree get_ref_base_and_extent (tree, HOST_WIDE_INT *,
+				     HOST_WIDE_INT *, HOST_WIDE_INT *);
 
 /* In tree-phinodes.c  */
 extern void reserve_phi_args_for_new_edge (basic_block);
@@ -804,43 +640,6 @@ extern bool block_may_fallthru (const_tree);
 extern bool gimple_seq_may_fallthru (gimple_seq);
 extern bool gimple_stmt_may_fallthru (gimple);
 
-/* In tree-ssa-alias.c  */
-extern unsigned int compute_may_aliases (void);
-extern void dump_may_aliases_for (FILE *, tree);
-extern void debug_may_aliases_for (tree);
-extern void dump_alias_info (FILE *);
-extern void debug_alias_info (void);
-extern void dump_points_to_info (FILE *);
-extern void debug_points_to_info (void);
-extern void dump_points_to_info_for (FILE *, tree);
-extern void debug_points_to_info_for (tree);
-extern bool may_be_aliased (tree);
-extern bool may_alias_p (tree, alias_set_type, tree, alias_set_type, bool);
-extern struct ptr_info_def *get_ptr_info (tree);
-extern bool may_point_to_global_var (tree);
-extern void new_type_alias (tree, tree, tree);
-extern void count_uses_and_derefs (tree, gimple, unsigned *, unsigned *,
-				   unsigned *);
-static inline bool ref_contains_array_ref (const_tree);
-static inline bool array_ref_contains_indirect_ref (const_tree);
-extern tree get_ref_base_and_extent (tree, HOST_WIDE_INT *,
-				     HOST_WIDE_INT *, HOST_WIDE_INT *);
-extern tree create_tag_raw (enum tree_code, tree, const char *);
-extern void delete_mem_ref_stats (struct function *);
-extern void dump_mem_ref_stats (FILE *);
-extern void debug_mem_ref_stats (void);
-extern void debug_memory_partitions (void);
-extern void debug_mem_sym_stats (tree var);
-extern void dump_mem_sym_stats_for_var (FILE *, tree);
-extern void debug_all_mem_sym_stats (void);
-
-/* Call-back function for walk_use_def_chains().  At each reaching
-   definition, a function with this prototype is called.  */
-typedef bool (*walk_use_def_chains_fn) (tree, gimple, void *);
-
-/* In tree-ssa-alias-warnings.c  */
-extern void strict_aliasing_warning_backend (void);
-
 
 /* In tree-ssa.c  */
 
@@ -869,8 +668,14 @@ extern edge ssa_redirect_edge (edge, basic_block);
 extern void flush_pending_stmts (edge);
 extern void verify_ssa (bool);
 extern void delete_tree_ssa (void);
-extern void walk_use_def_chains (tree, walk_use_def_chains_fn, void *, bool);
 extern bool ssa_undefined_value_p (tree);
+extern void execute_update_addresses_taken (bool);
+
+/* Call-back function for walk_use_def_chains().  At each reaching
+   definition, a function with this prototype is called.  */
+typedef bool (*walk_use_def_chains_fn) (tree, gimple, void *);
+
+extern void walk_use_def_chains (tree, walk_use_def_chains_fn, void *, bool);
 
 
 /* In tree-into-ssa.c  */
@@ -878,7 +683,7 @@ void update_ssa (unsigned);
 void delete_update_ssa (void);
 void register_new_name_mapping (tree, tree);
 tree create_new_def_for (tree, gimple, def_operand_p);
-bool need_ssa_update_p (void);
+bool need_ssa_update_p (struct function *);
 bool name_mappings_registered_p (void);
 bool name_registered_for_update_p (tree);
 bitmap ssa_names_to_replace (void);
@@ -1065,9 +870,10 @@ char *get_lsm_tmp_name (tree, unsigned);
 
 /* In tree-flow-inline.h  */
 static inline bool is_call_clobbered (const_tree);
-static inline void mark_call_clobbered (tree, unsigned int);
 static inline void set_is_used (tree);
 static inline bool unmodifiable_var_p (const_tree);
+static inline bool ref_contains_array_ref (const_tree);
+static inline bool array_ref_contains_indirect_ref (const_tree);
 
 /* In tree-eh.c  */
 extern void make_eh_edges (gimple);
@@ -1149,11 +955,6 @@ tree force_gimple_operand_gsi (gimple_stmt_iterator *, tree, bool, tree,
 tree gimple_fold_indirect_ref (tree);
 void mark_addressable (tree);
 
-/* In tree-ssa-structalias.c */
-bool find_what_p_points_to (tree);
-bool clobber_what_escaped (void);
-void compute_call_used_vars (void);
-
 /* In tree-ssa-live.c */
 extern void remove_unused_locals (void);
 extern void dump_scope_blocks (FILE *, int);
@@ -1174,8 +975,6 @@ rtx addr_for_mem_ref (struct mem_address *, bool);
 void get_address_description (tree, struct mem_address *);
 tree maybe_fold_tmr (tree);
 
-void init_alias_heapvars (void);
-void delete_alias_heapvars (void);
 unsigned int execute_fixup_cfg (void);
 
 #include "tree-flow-inline.h"