[Bug tree-optimization/121320] UBSAN error in tree-ssa-sccvn (signed integer overflow: 2305843009213693952 * 8 cannot be represented in type 'long int')

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121320

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2025-07-30
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
           Keywords|                            |wrong-code

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  poly_offset_int offset = 0;
...
            offset += op->off * BITS_PER_UNIT;

2305843009213693952  is 0x2000000000000000

  /* Constant offset this op adds or -1 if it is variable.  */
  poly_int64 off;

Most likely op->off needs to be first casted to poly_offset_int and then done
the multiply.

line 1222 has a similar issue.