[Bug rtl-optimization/33928] [4.3/4.4/4.5/4.6 Regression] 30% performance slowdown in floating-point code caused by r118475

[bergner at gcc dot gnu dot org]

------- Comment #113 from bergner at gcc dot gnu dot org  2010-04-29 14:34 -------
Subject: Bug 33928

Author: bergner
Date: Thu Apr 29 14:34:35 2010
New Revision: 158902

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158902
Log:
        Backport from mainline.

        2009-08-30  Alan Modra  <amodra@bigpond.net.au>

        PR target/41081
        * fwprop.c (get_reg_use_in): Delete.
        (free_load_extend): New function.
        (forward_propagate_subreg): Use it.

        2009-08-23  Alan Modra  <amodra@bigpond.net.au>

        PR target/41081
        * fwprop.c (try_fwprop_subst): Allow multiple sets.
        (get_reg_use_in): New function.
        (forward_propagate_subreg): Propagate through subreg of zero_extend
        or sign_extend.

        2009-05-08  Paolo Bonzini  <bonzini@gnu.org>

        PR rtl-optimization/33928
        PR 26854
        * fwprop.c (use_def_ref, get_def_for_use, bitmap_only_bit_bitween,
        process_uses, build_single_def_use_links): New.
        (update_df): Update use_def_ref.
        (forward_propagate_into): Use get_def_for_use instead of use-def
        chains.
        (fwprop_init): Call build_single_def_use_links and let it initialize
        dataflow.
        (fwprop_done): Free use_def_ref.
        (fwprop_addr): Eliminate duplicate call to df_set_flags.
        * df-problems.c (df_rd_simulate_artificial_defs_at_top,
        df_rd_simulate_one_insn): New.
        (df_rd_bb_local_compute_process_def): Update head comment.
        (df_chain_create_bb): Use the new RD simulation functions.
        * df.h (df_rd_simulate_artificial_defs_at_top,
        df_rd_simulate_one_insn): New.
        * opts.c (decode_options): Enable fwprop at -O1.
        * doc/invoke.texi (-fforward-propagate): Document this.

Modified:
    branches/ibm/gcc-4_4-branch/gcc/ChangeLog.ibm
    branches/ibm/gcc-4_4-branch/gcc/df-problems.c
    branches/ibm/gcc-4_4-branch/gcc/df.h
    branches/ibm/gcc-4_4-branch/gcc/doc/invoke.texi
    branches/ibm/gcc-4_4-branch/gcc/fwprop.c
    branches/ibm/gcc-4_4-branch/gcc/opts.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928