[Bug c/111820] New: GCC: 14: hangs with a simple while loop

[141242068 at smail dot nju.edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111820

            Bug ID: 111820
           Summary: GCC: 14: hangs with a simple while loop
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: 141242068 at smail dot nju.edu.cn
  Target Milestone: ---

Compiler Explorer: https://godbolt.org/z/ezdG5GGd8

When compile below program with option `-O3 -fno-tree-vrp`, GCC consumes upto
46 seconds to finish:
```
int r;
int r_0;

void f (void)
{
  int n = 0;
  while (-- n)
    {
      r_0 += r ;
      r  += r;
      r  += r ;
      r  += r ;
      r  >= r ;
      r  += r ;
    }
}
```