fix 20650

[Geoff Keating]

On 06/04/2005, at 4:53 AM, Segher Boessenkool wrote:

>> There must be other ports that have instructions that can operate  
>> only on memory; does anyone know an example?
>>
>
> i386 fnstsw (i.e., *cmpfp_<mode>).

I don't see how memory is involved in those at all; everything is  
register_operand.

> Also RS6000 already has some: lfq, stfq, lmw, stmw.

I meant, an instruction that's generated from optabs.  For instance,  
a port where the 'add' operation can only take memory operands.

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