optimization/10196: [3.3/3.4 regression] Compile time regression with inlining

[Richard Guenther]

The following reply was made to PR optimization/10196; it has been noted by GNATS.

From: Richard Guenther <rguenth@tat.physik.uni-tuebingen.de>
To: gcc-gnats@gcc.gnu.org
Cc: gcc-bugs@gcc.gnu.org, <nobody@gcc.gnu.org>
Subject: Re: optimization/10196: [3.3/3.4 regression] Compile time regression
 with inlining
Date: Tue, 8 Apr 2003 16:42:16 +0200 (CEST)

 Got some profiles from g++ (GCC) 3.3 20030408 (prerelease) for the
 testcases (with and without exception handling enabled) at
 
 http://www.tat.physik.uni-tuebingen.de/~rguenth/DynamicLayout.cmpl.ii.ex.prof.gz
 
 for the testcase at
 http://www.tat.physik.uni-tuebingen.de/~rguenth/DynamicLayout2.cmpl.ii.gz
 compiled with -O2
 
 and
 
 http://www.tat.physik.uni-tuebingen.de/~rguenth/DynamicLayout.cmpl.ii.noex.prof.gz
 
 for the testcase at
 http://www.tat.physik.uni-tuebingen.de/~rguenth/DynamicLayout.cmpl.ii.noex.gz
 compiled with -O2 -fno-exceptions
 
 The top of the (flat) profiles is for the -fno-exceptions case:
   %   cumulative   self              self     total
  time   seconds   seconds    calls  ms/call  ms/call  name
   5.82      0.80     0.80   766758     0.00     0.00  walk_tree
   2.62      1.16     0.36  2894249     0.00     0.00
 htab_find_slot_with_hash
   2.25      1.47     0.31        1   310.00 13483.20  yyparse
   1.75      1.71     0.24  3031555     0.00     0.00  ggc_alloc
   1.45      1.91     0.20  4068886     0.00     0.00  statement_code_p
   1.45      2.11     0.20   460662     0.00     0.00
 splay_tree_splay_helper
   1.31      2.29     0.18  1667085     0.00     0.00  timevar_push
   1.31      2.47     0.18   486047     0.00     0.00  for_each_rtx
   1.24      2.64     0.17  2731899     0.00     0.00  htab_find_slot
   1.24      2.81     0.17   102119     0.00     0.00  cse_insn
   1.24      2.98     0.17    68502     0.00     0.00
 gt_ggc_mx_lang_tree_node
   1.09      3.13     0.15  3334173     0.00     0.00  get_time
 
 and for the -fexceptions case:
   %   cumulative   self              self     total
  time   seconds   seconds    calls  ms/call  ms/call  name
   6.92     11.24    11.24  1531056     0.01     0.02  walk_tree
   6.61     21.97    10.73  1048564     0.01     0.01
 flow_delete_block_noexpunge
   4.72     29.63     7.66  3413593     0.00     0.00  emit_insn
   2.97     34.46     4.83  1767371     0.00     0.00
 gt_ggc_mx_lang_tree_node
   2.66     38.78     4.32    17457     0.25     0.25  clear_table
   2.63     43.05     4.27 20409582     0.00     0.00  copy_node
   2.56     47.21     4.16     1582     2.63     2.71  init_alias_analysis
   2.39     51.10     3.89 42221301     0.00     0.00  ggc_alloc
   1.98     54.32     3.22 86395200     0.00     0.00  statement_code_p
   1.95     57.48     3.16 52652842     0.00     0.00  ggc_set_mark
   1.83     60.46     2.98  3539665     0.00     0.00  gt_ggc_mx_rtx_def
   1.70     63.22     2.76 23360833     0.00     0.00  copy_tree_r
 
 But I dont really know where to look for (remember, -fno-default-inline
 sort of "fixes" the problem, too).
 
 Richard.