[Bug tree-optimization/97623] [9/10/11 Regression] Extremely slow O2 compile (>>O(n^2))

[wsnyder at wsnyder dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97623

--- Comment #10 from Wilson Snyder <wsnyder at wsnyder dot org> ---
Running -O2 -fno-code-hoisting -ftime-report

and I deleted the 0%/0%/0% lines:

Time variable                                   usr           sys          wall
              GGC
 phase parsing                      :   0.34 (  1%)   0.18 ( 67%)   0.52 (  1%)
  75469 kB ( 46%)
 phase lang. deferred               :   0.02 (  0%)   0.01 (  4%)   0.02 (  0%)
   3473 kB (  2%)
 phase opt and generate             :  38.01 ( 99%)   0.08 ( 30%)  38.12 ( 99%)
  85265 kB ( 51%)
 |name lookup                       :   0.06 (  0%)   0.02 (  7%)   0.10 (  0%)
   3222 kB (  2%)
 |overload resolution               :   0.02 (  0%)   0.01 (  4%)   0.03 (  0%)
   3886 kB (  2%)
 alias stmt walking                 :   0.27 (  1%)   0.00 (  0%)   0.34 (  1%)
      1 kB (  0%)
 preprocessing                      :   0.05 (  0%)   0.06 ( 22%)   0.07 (  0%)
   6448 kB (  4%)
 parser (global)                    :   0.04 (  0%)   0.04 ( 15%)   0.12 (  0%)
  29550 kB ( 18%)
 parser struct body                 :   0.03 (  0%)   0.02 (  7%)   0.10 (  0%)
  10609 kB (  6%)
 parser function body               :   0.08 (  0%)   0.02 (  7%)   0.09 (  0%)
  12779 kB (  8%)
 parser inl. func. body             :   0.02 (  0%)   0.03 ( 11%)   0.06 (  0%)
   3940 kB (  2%)
 parser inl. meth. body             :   0.05 (  0%)   0.01 (  4%)   0.05 (  0%)
   4949 kB (  3%)
 template instantiation             :   0.09 (  0%)   0.01 (  4%)   0.04 (  0%)
  10514 kB (  6%)
 tree SSA incremental               :   0.01 (  0%)   0.01 (  4%)   0.02 (  0%)
   6465 kB (  4%)
 tree operand scan                  :   0.00 (  0%)   0.01 (  4%)   0.01 (  0%)
   1875 kB (  1%)
 tree PRE                           :  36.36 ( 95%)   0.05 ( 19%)  36.34 ( 94%)
  32604 kB ( 20%)
 out of ssa                         :   0.17 (  0%)   0.00 (  0%)   0.17 (  0%)
      0 kB (  0%)
 combiner                           :   0.16 (  0%)   0.00 (  0%)   0.16 (  0%)
  11911 kB (  7%)
 integrated RA                      :   0.11 (  0%)   0.00 (  0%)   0.12 (  0%)
   4562 kB (  3%)
 initialize rtl                     :   0.00 (  0%)   0.01 (  4%)   0.00 (  0%)
     12 kB (  0%)
 TOTAL                              :  38.37          0.27         38.67       
 165692 kB

real    0m38.707s
user    0m38.398s
sys     0m0.292s