[Bug rtl-optimization/80318] GCC takes too much RAM and time compiling a template file (var-tracking)

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80318

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Second largest seems to be the frontend, as with -fsyntax-only we still need
18s and 1.8GB (this is 8.1 with release checking):

Time variable                                   usr           sys          wall
              GGC
 phase setup                        :   0.00 (  0%)   0.00 (  0%)   0.00 (  0%)
   1381 kB (  0%)
 phase parsing                      :   4.01 ( 22%)   0.80 ( 30%)   4.82 ( 23%)
 519422 kB ( 27%)
 phase lang. deferred               :  13.96 ( 78%)   1.83 ( 70%)  15.82 ( 77%)
1414614 kB ( 73%)
 |name lookup                       :   1.89 ( 11%)   0.35 ( 13%)   2.08 ( 10%)
  99986 kB (  5%)
 |overload resolution               :   8.94 ( 50%)   1.29 ( 49%)  10.10 ( 49%)
 934750 kB ( 48%)
 garbage collection                 :   1.79 ( 10%)   0.00 (  0%)   1.80 (  9%)
      0 kB (  0%)
 preprocessing                      :   0.14 (  1%)   0.12 (  5%)   0.37 (  2%)
   2890 kB (  0%)
 parser (global)                    :   0.58 (  3%)   0.21 (  8%)   0.73 (  4%)
 115783 kB (  6%)
 parser struct body                 :   0.74 (  4%)   0.09 (  3%)   0.77 (  4%)
  81383 kB (  4%)
 parser enumerator list             :   0.01 (  0%)   0.00 (  0%)   0.00 (  0%)
    364 kB (  0%)
 parser function body               :   0.05 (  0%)   0.03 (  1%)   0.07 (  0%)
   4688 kB (  0%)
 parser inl. func. body             :   0.10 (  1%)   0.01 (  0%)   0.12 (  1%)
   6402 kB (  0%)
 parser inl. meth. body             :   0.41 (  2%)   0.06 (  2%)   0.39 (  2%)
  27538 kB (  1%)
 template instantiation             :  13.86 ( 77%)   2.06 ( 78%)  16.02 ( 78%)
1694216 kB ( 88%)
 constant expression evaluation     :   0.26 (  1%)   0.04 (  2%)   0.27 (  1%)
    729 kB (  0%)
 varconst                           :   0.01 (  0%)   0.00 (  0%)   0.03 (  0%)
     39 kB (  0%)
 symout                             :   0.02 (  0%)   0.01 (  0%)   0.07 (  0%)
      0 kB (  0%)
 TOTAL                              :  17.97          2.63         20.65       
1935427 kB