[Bug c/96760] Faulty optimization in nested loops with -O2

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96760

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2020-08-24
     Ever confirmed|0                           |1
         Resolution|INVALID                     |---

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
The inner loop never reaches the increment expression because c is nonzero,
thus no undefined behaviour occurs.