[Bug tree-optimization/34683] [4.3 Regression] Fortran FE generated IL pessimizes middle-end IL and analysis

[rguenth at gcc dot gnu dot org]

------- Comment #21 from rguenth at gcc dot gnu dot org  2008-01-07 15:08 -------
Without the loop optimizer the profile looks like:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
  9.77      2.96     2.96 14743868     0.00     0.00  add_vars_for_offset
  8.00      5.38     2.42                             vuses_compare
  7.06      7.51     2.14 44262948     0.00     0.00  add_virtual_operand
  6.65      9.52     2.01 235204852     0.00     0.00  var_ann
  4.83     10.98     1.46 68814811     0.00     0.00  iterative_hash_expr
  4.66     12.39     1.41      172     0.01     0.04  DFS
  4.63     13.79     1.40 69248754     0.00     0.00  htab_find_with_hash
  4.28     15.09     1.30  1229783     0.00     0.00  ggc_alloc_stat
  4.13     16.34     1.25 206399974     0.00     0.00  VN_INFO
  4.00     17.55     1.21 19029637     0.00     0.00  set_bb_for_stmt
  3.74     18.68     1.13    12610     0.00     0.00  get_call_expr_operands
  2.88     19.55     0.87   266239     0.00     0.00  valueize_vuses
  2.31     20.25     0.70 68677290     0.00     0.00  uid_decl_map_eq
  2.25     20.93     0.68   129473     0.00     0.00  visit_reference_op_store
  1.90     21.50     0.58 114366877     0.00     0.00  is_gimple_reg
  1.49     21.95     0.45   147496     0.00     0.00  vec_gc_o_reserve_1
  1.41     22.38     0.43 68653081     0.00     0.00  referenced_var_lookup

and most of the time (cfgcleanup and operand scanner globbed into passes) is
spent in

 tree PHI const/copy prop:  27.82 (42%) usr   0.05 ( 5%) sys  27.95 (41%) wall 
     8 kB ( 0%) ggc
 tree FRE              :  24.94 (37%) usr   0.78 (73%) sys  25.73 (38%) wall 
508759 kB (80%) ggc


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34683