[Bug tree-optimization/117467] New: [15 Regression] 521.wrf_r again explodes memory/compile-time wise

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117467

            Bug ID: 117467
           Summary: [15 Regression] 521.wrf_r again explodes
                    memory/compile-time wise
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

It tops 25GB memory usage when building with -Ofast -march=znver5 -fno-checking
-fopt-info-vec

One of the big offending TUs is start_em.fppized.f90, but the worst seems to
be module_first_rk_step_part1.fppized.f90 for which -ftime-report (checking
bootstrapped build, but -fno-checking) shows

 df reaching defs                   :  35.27 (  7%)     0  (  0%)
 tree VRP                           :  81.03 ( 16%)   125M (  4%)
 dominator optimization             :  28.98 (  6%)    84M (  3%)
 LRA non-specific                   :  23.21 (  5%)    63M (  2%)
 rest of compilation                : 167.62 ( 33%)    23M (  1%)
 TOTAL                              : 506.00         3218M