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

["rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

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

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 9 Dec 2016, mpolacek at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78742
> 
> --- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
> FWIW, my untested fix was
> 
> --- a/gcc/tree-data-ref.c
> +++ b/gcc/tree-data-ref.c
> @@ -2781,6 +2781,10 @@ can_use_analyze_subscript_affine_affine (tree *chrec_a,
> tree *chrec_b)
>      /* FIXME: For the moment not handled.  Might be refined later.  */
>      return false;
> 
> +  if (!cst_and_fits_in_hwi (CHREC_RIGHT (*chrec_a))
> +      || !cst_and_fits_in_hwi (CHREC_RIGHT (*chrec_b)))
> +    return false;
> +
>    type = chrec_type (*chrec_a);
>    left_a = CHREC_LEFT (*chrec_a);
>    left_b = chrec_convert (type, CHREC_LEFT (*chrec_b), NULL);

In fact initialize_matrix_A relies on the value fitting an int ...

I'll see to a better fix.