[Bug tree-optimization/18687] [4.3/4.4/4.5 Regression] ~50% compile time regression

["steven at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #45 from steven at gcc dot gnu dot org  2009-12-28 20:28 -------
Profile for cc1 for SVN r155486 looks like this (all items with >0.5% time):

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
  3.79      0.29     0.29  3718720     0.00     0.00  operand_equal_p
  2.87      0.51     0.22  6543125     0.00     0.00  htab_find_slot_with_hash
  2.15      0.68     0.17 18227570     0.00     0.00  bitmap_set_bit
  2.09      0.84     0.16     1614     0.00     0.00  df_note_compute
  1.83      0.98     0.14                             _fini
  1.63      1.10     0.13  3266034     0.00     0.00  mem_attrs_htab_eq
  1.44      1.21     0.11 23919785     0.00     0.00  bitmap_bit_p
  1.44      1.32     0.11   118624     0.00     0.00  free_ira_costs
  1.31      1.42     0.10  4998409     0.00     0.00  bitmap_ior_into
  1.31      1.52     0.10     7015     0.00     0.00  df_worklist_dataflow
  1.24      1.62     0.10  1319725     0.00     0.00  bitmap_copy
  0.91      1.69     0.07  2951661     0.00     0.00  note_stores
  0.91      1.76     0.07  1709658     0.00     0.00  bitmap_ior_and_compl
  0.91      1.83     0.07  1639154     0.00     0.00  et_splay
  0.78      1.89     0.06  1552007     0.00     0.00  rtx_alloc_stat
  0.78      1.95     0.06  6404265     0.00     0.00  bitmap_clear
  0.78      2.01     0.06  4110147     0.00     0.00  bitmap_elt_insert_after
  0.78      2.07     0.06   598552     0.00     0.00  constrain_operands
  0.78      2.13     0.06    71808     0.00     0.00  df_lr_bb_local_compute
  0.78      2.19     0.06      909     0.00     0.00  substitute_and_fold
  0.65      2.24     0.05  5297243     0.00     0.00  mark_all_vars_used_1
  0.65      2.29     0.05  1652326     0.00     0.00  htab_find_with_hash
  0.65      2.34     0.05     1008     0.00     0.00  init_alias_analysis
  0.52      2.38     0.04  7167584     0.00     0.00  bitmap_elt_clear_from
  0.52      2.42     0.04  4744012     0.00     0.00  walk_tree_1
  0.52      2.46     0.04  4472070     0.00     0.00  is_gimple_reg
  0.52      2.50     0.04  1727617     0.00     0.00  gsi_start_phis
  0.52      2.54     0.04  1054932     0.00     0.00  for_each_rtx_1
  0.52      2.58     0.04   824795     0.00     0.00  fold_binary_loc
  0.52      2.62     0.04   733470     0.00     0.00  invalid_mode_change_p
  0.52      2.66     0.04   396082     0.00     0.00  count_reg_usage
  0.52      2.70     0.04   238716     0.00     0.00  df_chain_create
  0.52      2.74     0.04   210927     0.00     0.00  cse_insn
  0.52      2.78     0.04   106118     0.00     0.00  find_reloads
  0.52      2.82     0.04    41200     0.00     0.00  dfs_enumerate_from
  0.52      2.86     0.04      202     0.00     0.00  run_scc_vn


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687