> (2) When and if you switch to this:
>
> class machine_mode
> {
> enum value_t {
> VOIDmode, SImode, // ...
> } value;
>
> // accessors, whatever ...
> };
I think what Mark wants is to migrate to this:
class machine_mode_desc
{
unsigned char bits;
unsigned char is_signed:1;
unsigned char partial_bits;
unsigned char vector_width;
char *name;
// accessors, whatever
};
class machine_mode
{
machine_mode_desc *mode_data;
// various constructors
}
And the target can do this in tm.c:
class machine_mode SImode ("SI", 32);
class machine_mode V4QImode ("V4QI", 8, 0, 8, 4);
Then, the MI parts can obtain a mode with certain characteristics,
enumerate available modes, and get info about a given mode, but don't
have a compile-time identifier for a "well-known named" mode.
