[Bug tree-optimization/78742] [5/6/7 Regression] internal compiler error: in int_cst_value, at tree.c:10782

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78742

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is also that

bool
cst_and_fits_in_hwi (const_tree x)
{
  return (TREE_CODE (x) == INTEGER_CST
          && TYPE_PRECISION (TREE_TYPE (x)) <= HOST_BITS_PER_WIDE_INT);
}

returns false for a __int128 constant of value 1.

And that tree-data-ref.c happily uses int's to store the result of
int_cst_value.