[Bug target/123089] [16 regression] [x86] Excessive run time with -march=znver3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123089

Sam James <sjames at gcc dot gnu.org> changed:

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

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
I'm not sure if the original is valid.

cvise got it down to:
```
struct
{
  int d;
  short e;
} i;

int b;
int *h = &b;

int
main ()
{
  short f = 1;
  short *g = &i.e;

a:
  if (*g = 0 & ++f, *h)
    ;
  else
    {
      int c = 0;
      if (f)
        goto a;
      h = &c;
    }

  return 0;
}
```

but the pointer to c is dangling. If I go back to the original, it has tonnes
of -Wdangling-pointer.