Describe more Sparc RTX costs

[Jan Hubicka]

>    From: Jan Hubicka <jh@suse.cz>
>    Date: Sun, 5 May 2002 11:19:47 +0200
> 
>    > +    case MEM:
>    > +      /* If outer-code is SIGN/ZERO extension we have to subtract
>    > +	 out COSTS_N_INSNS (1) from whatever we return in determining
>    > +	 the cost.  */
>    > +      switch (sparc_cpu)
>    
>    Should not we just default to address cost here?
>    
> When ADDRESS_COST is constant (as it is on Alpha, Sparc, etc.)
> CSE runs rtx_cost on the two memory expressions to break the
> tie.
Whats the purpose for doing this? Can't we just use address_cost to describe
the difference?

Honza
> 
>