On Sat, Jun 22 2024, Gerd Möllmann wrote:

> I was thinking of using 1 struct instead of 4, like so
>
>   enum Lisp_Fwd_Pred
>   {
>     /* Something with values for the Lisp_Object predicate ... */
>     ...  
>   };
>
>   struct Lisp_Fwd
>   {
>     enum Lisp_Fwd_Type : 8;
>     enum Lisp_Fwd_Predicate predicate : 8;
>     union
>     {
>       intmax_t *intvar;
>       bool *boolvar;
>       Lisp_Object *objvar;
>       int offset;
>     } u;
>   };
>
> Then removing the Lisp_Fwd_Bool etc. structures that currently exist and
> replace this
>
>   typedef struct { void const *fwdptr; } lispfwd;
>
> which is just a void * with ornaments, with const struct Lisp_Fwd *.

These patches do this; only that the predicate is still a Lisp_Object.