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[alias-export] Put the current version of the patch on the branch


This is the current alias/ddg export patch. To ease the testing of the future stack slot sharing stuff, by default the export data is recorded but not used. To use the data, one needs to make the alias/ddg export flags in common.opt default to 1, in which case everything should still work.

The patch contains some checking code which will be eliminated from the final version. The other changes needed are described in the previous mail: expand from SSA, fix ddg data after unrolling, fix stack slot sharing properly (not relying on must-alias computations of memrefs_conflict_p).

Bootstrapped c/c++/fortran on x86-64, committed to the branch.


2009-04-09  Andrey Belevantsev  <>
            Dmitry Melnik  <>
            Alexander Monakov  <>

* alias-export.c: New file.
* alias-export.h: New file.
* dbgcnt.def (alias_export): New counter.
* tree.c (iterative_hash_gimple): New.
* tree.h (iterative_hash_gimple): Export it.
* tree-pass.h (pass_check_alias_export_rtl,
pass_report_alias_export_stat, pass_free_alias_export,
pass_gather_ddg_info, pass_free_ddg_info): Export.
* ddg.c: Include alias-export.h.
* builtins.c (get_memory_rtx): Also set MEM_ORIG_EXPR to NULL.
* tree-ssa-uncprop.c (pass_uncprop): Set TODO_rebuild_alias.
* toplev.c (finalize): Call alias_export_finish_once.
* tree-ssa-loop-ivopts.c: Include alias-export.h.
(copy_ref_info): Record new reference in ddg export data.
* tree-ssa-alias.c: Include alias-export.h.
(ptr_deref_may_alias_decl_p): Add expi and exescaped parameters.
Use them to access PTA data. Adjust assert to include RTL case.
(ptr_derefs_may_alias_p): Add expi1, expi2, exescaped parameters.
Use them to access PTA data. Adjust assert to include RTL case.
(indirect_ref_may_alias_decl_p): Add expi1 and exescaped parameters.
Use them to access PTA data.
(indirect_refs_may_alias_p): Add expi1, expi2, exesaped parameters.
Use them to access PTA data.
(refs_may_alias_p_1): Likewise. Adjust assert to include RTL case.
* tree-ssa-alias.h (refs_may_alias_p_1, pt_solution_includes_1,
pt_solutions_intersect_1): Export.
* expr.c (expand_expr_real_1): When expanding TARGET_MEM_REF,
* function.c (assign_parms_unsplit_complex): Also set MEM_ORIG_EXPR
for parm.
* alias.c: Include alias-export.h.
(query_alias_export_info): New.
(walk_mems_2): Also query ddg export info.
(memrefs_conflict_p): Return 2 when we're sure that memrefs conflict.
(true_dependence): Use query_alias_export_info.
(canon_true_dependence, write_dependence_p): Likewise.
* emit-rtl.c: Include alias-export.h.
(mem_attrs_htab_hash, get_mem_attrs, set_mem_attrs_from_reg,
set_mem_alias_set, set_mem_align, set_mem_expr, set_mem_offset,
set_mem_size, change_address, offset_address,
widen_memory_access, get_spill_slot_decl,
set_mem_attrs_for_spill): Account for MEM_ORIG_EXPR.
(set_mem_orig_expr): New.
(set_mem_attributes_minus_bitpos): Record MEM_ORIG_EXPR.
(adjust_address_1): When we make a wider address, nullify MEM_ORIG_EXPR.
* cfgexpand.c: Include alias-export.h.
(union_stack_vars): Promote TRE_ADDRESSABLE to the merged partition
(record_stack_var_partitions): New.
(expand_used_vars): Call it.
(expand_gimple_cond, expand_gimple_tailcall,
expand_gimple_basic_block): Make alias-export aware of currently expanding
(discover_nonconstant_array_refs_r): Make only BLKmode arrays addressable.
Call record_addressable_bases.
(gimple_expand_cfg): Call release_temporary_export_maps.
* emit-rtl.h (set_mem_orig_expr): Export.
* common.opt (falias-export, falias-export-check, fddg-export): New options.
* tree-ssa.c: Include alias-export.h.
(delete_tree_ssa): Record escaped solution for alias export.
* rtl.h (struct mem_attrs): New field orig_expr.
(MEM_ORIG_EXPR): New access macro.
(alias_export_finish_once): Export.
* tree-outof-ssa.c: Include alias-export.h.
(replace_use_variable): New argument stmt.
Record PTA info and substitution info for alias export.
* (OBJS-common): Add alias-export.o. Reflect dependencies from
* tree-ssa-structalias.c (pt_solution_includes_1, pt_solutions_intersect_1):
Add escaped parameter, make global.
* gimple.h (find_pos_in_stmt): Export.
* passes.c (init_optimization_passes): Schedule passes of alias export
and ddg export.
* ipa-struct-reorg.c (find_pos_in_stmt): Make global.

Attachment: alias-export-patch-branch.diff.gz
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