[Bug middle-end/37790] limits-fnargs.c takes very long time to compile at -O2

[hjl at gcc dot gnu dot org]

------- Comment #3 from hjl at gcc dot gnu dot org  2008-11-16 19:49 -------
Subject: Bug 37790

Author: hjl
Date: Sun Nov 16 19:47:40 2008
New Revision: 141924

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141924
Log:
2008-11-16  Vladimir Makarov  <vmakarov@redhat.com>

        PR bootstrap/37790
        * ira-int.h (ira_copy_allocno_live_range_list,
        ira_merge_allocno_live_ranges,
        ira_allocno_live_ranges_intersect_p,
        ira_finish_allocno_live_range_list): New prototypes.
        (ira_allocno_live_ranges_intersect_p,
        ira_pseudo_live_ranges_intersect_p): Remove.

        * ira-conflicts.c (ira_allocno_live_ranges_intersect_p,
        ira_pseudo_live_ranges_intersect_p): Rename to
        allocnos_have_intersected_live_ranges_p and
        pseudos_have_intersected_live_ranges_p.  Move them from here to
        ...

        * ira-color.c: ... here
        (coalesced_allocno_conflict_p): Use
        allocnos_have_intersected_live_ranges_p.
        (coalesced_allocnos_living_at_program_points,
        coalesced_allocnos_live_at_points_p,
        set_coalesced_allocnos_live_points): Remove.
        (slot_coalesced_allocnos_live_ranges,
        slot_coalesced_allocno_live_ranges_intersect_p,
        setup_slot_coalesced_allocno_live_ranges): New.
        (coalesce_spill_slots): Use ranges of coalesced allocnos.
        (ira_sort_regnos_for_alter_reg): Use
        allocnos_have_intersected_live_ranges_p.
        (ira_reuse_stack_slot): Use
        pseudos_have_intersected_live_ranges_p.

        * global.c (pseudo_for_reload_consideration_p): Check
        flag_ira_share_spill_slots too.

        * ira-build.c (copy_allocno_live_range_list): Rename to
        ira_copy_allocno_live_range_list.  Make it external.
        (merge_ranges): Rename to ira_merge_allocno_live_ranges.  Make it
        external.
        (ira_allocno_live_ranges_intersect_p): New.
        (ira_finish_allocno_live_range_list): New.
        (finish_allocno): Use it.
        (remove_unnecessary_allocnos): Use ira_merge_allocno_live_ranges.
        (copy_info_to_removed_store_destinations): Ditto.  Use
        ira_copy_allocno_live_range_list.
        (ira_flattening): Use ira_merge_allocno_live_ranges.

        * ira.c (too_high_register_pressure_p): New function.
        (ira): Switch off sharing spill slots if the pressure is too high.

Modified:
    branches/ira-merge/gcc/ChangeLog.ira
    branches/ira-merge/gcc/global.c
    branches/ira-merge/gcc/ira-build.c
    branches/ira-merge/gcc/ira-color.c
    branches/ira-merge/gcc/ira-conflicts.c
    branches/ira-merge/gcc/ira-int.h
    branches/ira-merge/gcc/ira.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37790