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* [Bug tree-optimization/103254] New: [12 Regression] Compile time hog in compare_values_warnv
@ 2021-11-15 17:27 asolokha at gmx dot com
  2021-11-16  8:18 ` [Bug tree-optimization/103254] [12 Regression] Compile time hog in compare_values_warnv since r12-4790-g4b3a325f07acebf4 marxin at gcc dot gnu.org
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: asolokha at gmx dot com @ 2021-11-15 17:27 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103254

            Bug ID: 103254
           Summary: [12 Regression] Compile time hog in
                    compare_values_warnv
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc-12.0.0-alpha20111107 snapshot (g:962ff7d2849e1fa6a1fe0535aa2dec5c2b9a32a6)
takes indefinite time to compile the following testcase w/ -O3:

short int i;

void
foo (void)
{
  for (i = 1; i < 2; i += 4)
    {
      int j;

      for (j = 0; j < 5; j += 4)
        {
          int k;

          for (k = 0; k < 68; k += 4)
            {
              i &= j;
              j &= i;
            }
        }
    }
}

% timeout 10 gcc-12.0.0 -O3 -c mgyelpiv.c
zsh: exit 124   timeout 10 gcc-12.0.0 -O3 -c mgyelpiv.c

Several top entries from perf top output:

   8.03%  cc1        [.] wide_int_to_tree_1
   5.93%  cc1        [.] compare_values_warnv
   5.38%  cc1        [.] irange::irange_union
   4.72%  cc1        [.] irange::varying_compatible_p
   4.34%  cc1        [.] wi::to_wide
   3.23%  cc1        [.] irange::irange_intersect
   3.12%  cc1        [.] tree_int_cst_compare
   3.07%  cc1        [.] wi::force_to_size
   2.76%  cc1        [.] useless_type_conversion_p
   2.67%  cc1        [.] irange::lower_bound
   2.38%  cc1        [.] irange::set_varying
   2.31%  cc1        [.] wi::shifted_mask
   2.17%  cc1        [.] get_single_symbol
   1.91%  cc1        [.] int_cst_hasher::hash
   1.86%  cc1        [.] irange::verify_range
   1.84%  cc1        [.] wi::min_value
   1.84%  cc1        [.] irange::irange_set_anti_range
   1.63%  cc1        [.] wi::lts_p<generic_wide_int<wide_int_ref_storage<false,
false> >, generic_wide_int<wide_int_ref_storage<false, f
   1.46%  cc1        [.] operand_compare::operand_equal_p
   1.37%  cc1        [.] operator_cast::fold_pair
   1.35%  cc1        [.] gori_compute::compute_operand_range

^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-11-25 10:55 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-15 17:27 [Bug tree-optimization/103254] New: [12 Regression] Compile time hog in compare_values_warnv asolokha at gmx dot com
2021-11-16  8:18 ` [Bug tree-optimization/103254] [12 Regression] Compile time hog in compare_values_warnv since r12-4790-g4b3a325f07acebf4 marxin at gcc dot gnu.org
2021-11-16 10:11 ` aldyh at gcc dot gnu.org
2021-11-18 16:34 ` amacleod at redhat dot com
2021-11-19 16:43 ` cvs-commit at gcc dot gnu.org
2021-11-19 16:44 ` amacleod at redhat dot com
2021-11-25 10:55 ` cvs-commit at gcc dot gnu.org
2021-11-25 10:55 ` cvs-commit at gcc dot gnu.org

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