[Bug tree-optimization/98213] New: [11 Regression] Never ending compilation at -O3 since r11-161-g283cb9ea6293e813

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98213

            Bug ID: 98213
           Summary: [11 Regression] Never ending compilation at -O3 since
                    r11-161-g283cb9ea6293e813
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---

Since the revision, the following code does not terminate. The test-case was
given by yarpgen:

$ cat func.cpp
long var_23;
int var_24, test_var_8;
extern bool arr_20[][13];
char arr_21_0_0_0_0_0;
#include <algorithm>
int *test_arr_0;
void test(unsigned long long var_1) {
  int arr_16;
  for (int i_0 = 0;;)
    for (int i_5; i_5;) {
      for (int i_6 = 0; i_6 < 19; i_6 += 4)
        for (long i_7(test_var_8); i_7; i_7 += 2) {
          arr_20[0][i_7] = arr_21_0_0_0_0_0 = 0;
          var_23 = test_arr_0[0];
        }
      var_24 = std::max((unsigned long long)arr_16,
                        std::min((unsigned long long)5, var_1));
    }
}

$ timeout 10 g++ -O3 func.cpp -c
$ echo $?
124