[Bug tree-optimization/38785] [4.3/4.4/4.5 Regression] huge performance regression on EEMBC bitmnp01

["amylaar at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #20 from amylaar at gcc dot gnu dot org  2010-01-29 20:33 -------
Subject: Bug 38785

Author: amylaar
Date: Fri Jan 29 20:33:19 2010
New Revision: 156365

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156365
Log:
  PR tree-optimization/38785
  2009-02-02  J"orn Rennecke  <joern.rennecke@arc.com>
        * tree-ssa-pre.c (ppre_n_insert_for_speed_p): New function.
        * (do_partial_partial_insertion): Use it to throttle
        insert_into_preds_of_block calls.
        * common.opt (-ftree-pre-partial-partial-obliviously): New option.
  2009-01-15  Steven Bosscher  <steven@gcc.gnu.org>
        http://gcc.gnu.org/ml/gcc-patches/2008-12/msg00199.html
        * opts.c (decode_options): Fix initialization of
        flag_tree_switch_conversion.
        * tree-ssa-pre.c: Update outline of the algorithm.
        (bitmap_set_and): Prototype.
        (insert_into_preds_of_block): Don't report discovery of partial
        redundancies here, do so from the callers instead (see below).
        (do_regular_insertion): Add counter for an estimate for the number
        of inserts required to eliminate a partial redundancy.  If the
        current function is optimized for size, only perform the partial
        redundancy elimination if this requires inserting in only one
        predecessor.  Report all found partial redundancies from here.
        (do_partial_partial_insertion): Report them from here too.
        (insert_aux): Do not insert for partial-partial redundancies when
        optimizing for size.
        (do_pre): Run FRE at least, if PRE is disabled.
        (gate_pre): Return true if flag_tree pre or flag_tree_fre is set.
  2009-01-15  J"orn Rennecke  <joern.rennecke@arc.com>
        * common.opt (ftree-pre-partial-partial): New option.
        * opts.c (decode_options): Initialize flag_tree_pre_partial_partial.
        * tree-ssa-pre.c (execute_pre): Use flag_tree_pre_partial_partial.

Modified:
    branches/mpost-opt-imp-20100127/gcc/ChangeLog.mpost
    branches/mpost-opt-imp-20100127/gcc/FAILED-PATCHES
    branches/mpost-opt-imp-20100127/gcc/common.opt
    branches/mpost-opt-imp-20100127/gcc/opts.c
    branches/mpost-opt-imp-20100127/gcc/tree-ssa-pre.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38785