[Bug tree-optimization/91555] [9.2 regression] Optimizer bug

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91555

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
t5.c:754:7: runtime error: signed integer overflow: 4611686018427387904 * 2
cannot be represented in type 'long int'


This loop where the problem shows up:
                lo = 1;
                for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i)
                        lo *= 2;
                hi = -(lo + 1);

Changing it to:
                unsigned long long lo1 = 1;
                for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i)
                        lo1 *= 2;
                hi = -(lo1 + 1);
                lo = lo1;


Fixes the problem.