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40% performance regression SPEC2006/leslie3d on gcc-4_2-branch


Hello, Daniel

It looks like your changeset listed bellow makes performance
regression ~40% on SPEC2006/leslie3d. I will try to create minimal
test for this issue this week and update you in any case.

Feel free to ask if any question.

FYI:
Hardware is Core2Duo.

Compiler config
Target: x86_64-redhat-linux
Configured with: ../src/configure
--prefix=/home/vlad/sandbox/bin_search/117891/usr --program-suffix=-42
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-languages=fortran --disable-multilib --with-system-zlib
--host=x86_64-redhat-linux
Thread model: posix
gcc version 4.2.0 20061019 (experimental)


------------------------------------------------------------------------ r117891 | dberlin | 2006-10-20 03:05:53 +0400 (Fri, 20 Oct 2006) | 61 lines

2006-10-19 Daniel Berlin <dberlin@dberlin.org>

       Fix PR tree-optimization/28778
       Fix PR tree-optimization/29156
       Fix PR tree-optimization/29415
       * tree.h (DECL_PTA_ARTIFICIAL): New macro.
       (tree_decl_with_vis): Add artificial_pta_var flag.
       * tree-ssa-alias.c (is_escape_site): Remove alias info argument,
       pushed into callers.
       * tree-ssa-structalias.c (nonlocal_for_type): New variable.
       (nonlocal_all): Ditto.
       (struct variable_info): Add directly_dereferenced member.
       (var_escaped_vars): New variable.
       (escaped_vars_tree): Ditto.
       (escaped_vars_id): Ditto.
       (nonlocal_vars_id): Ditto.
       (new_var_info): Set directly_dereferenced.
       (graph_size): New variable
       (build_constraint_graph): Use graph_size.
       (solve_graph): Don't process constraints that cannot change the
       solution, don't try to propagate an empty solution to our
       successors.
       (process_constraint): Set directly_dereferenced.
       (could_have_pointers): New function.
       (get_constraint_for_component_ref): Don't process STRING_CST.
       (nonlocal_lookup): New function.
       (nonlocal_insert): Ditto.
       (create_nonlocal_var): Ditto.
       (get_nonlocal_id_for_type): Ditto.
       (get_constraint_for): Allow results vector to be empty in the case
       of string constants.
       Handle results of calls properly.
       (update_alias_info): Update alias info stats on number and type of
       calls.
       (find_func_aliases): Use could_have_pointers.
       (make_constraint_from_escaped): Renamed from
       make_constraint_to_anything, and changed to make constraints from
       escape variable.
       (make_constraint_to_escaped): New function.
       (find_global_initializers): Ditto.
       (create_variable_info_for): Make constraint from escaped to any
       global variable, and from any global variable to the set of
       escaped vars.
       (intra_create_variable_infos): Deal with escaped instead of
       pointing to anything.
       (set_uids_in_ptset): Do type pruning on directly dereferenced
       variables.
       (find_what_p_points_to): Adjust call to set_uids_with_ptset.
       (init_base_vars): Fix comment, and initialize escaped_vars.
       (need_to_solve): Removed.
       (find_escape_constraints): New function.
       (expand_nonlocal_solutions): Ditto.
       (compute_points_to_sets): Call find_escape_constraints and
       expand_nonlocal_solutions.
       (delete_points_to_sets): Don't fall off the end of the graph.
       (init_alias_heapvars): Initialize nonlocal_for_type and
       nonlocal_all.
       (delete_alias_heapvars): Free nonlocal_for_type and null out
       nonlocal_all.


------------------------------------------------------------------------ [

--
- Vladimir


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