[Bug tree-optimization/26830] [4.2 Regression] Repeated SSA update during loop header copying

[rakdver at gcc dot gnu dot org]

------- Comment #38 from rakdver at gcc dot gnu dot org  2006-05-15 18:25 -------
Subject: Bug 26830

Author: rakdver
Date: Mon May 15 18:24:55 2006
New Revision: 113799

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113799
Log:
        PR tree-optimization/26830
        * tree-into-ssa.c (struct ssa_name_info): Add age field.
        (info_for_ssa_name, current_info_for_ssa_name_age,
        blocks_to_update): New variables.
        (get_ssa_name_ann): Use info_for_ssa_name instead of SSA_NAME_AUX.
        (clear_ssa_name_info, initialize_flags_in_bb,
        mark_block_for_update): New functions.
        (mark_def_sites, rewrite_stmt): Assert that blocks_to_update is NULL.
        (insert_phi_nodes_for, mark_use_interesting, prepare_block_for_update,
        prepare_def_site_for): Use mark_block_for_update.
        (mark_def_interesting): Assert that the processed block is marked in
        blocks_to_update.  Do not take blocks argument.
        (prepare_use_sites_for, prepare_names_to_update): Do not take blocks
        argument.
        (rewrite_update_init_block, rewrite_update_stmt): Only process
        blocks with statements to rewrite.
        (delete_update_ssa): Do not clear SSA_NAME_AUX.
        (update_ssa): Initialize and free blocks_to_update.  Do not
        clear flags on statements.  Do not use blocks bitmap.
        * tree.h (SSA_NAME_AUX): Removed.
        (struct tree_ssa_name): Removed aux field.
        * print-tree.c (print_node): Do not print SSA_NAME_AUX.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/print-tree.c
    trunk/gcc/tree-into-ssa.c
    trunk/gcc/tree.h


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26830