Hans-Peter Nilsson <h...@bitrange.com> writes:
> On Tue, 31 May 2011, Richard Sandiford wrote:
>> Hans-Peter Nilsson <h...@bitrange.com> writes:
>> > Index: tm.texi.in
>> > ===================================================================
>> > --- tm.texi.in (revision 174376)
>> > +++ tm.texi.in (working copy)
>> > @@ -2327,6 +2327,11 @@ constraints is through machine-dependent
>> > You can define such letters to correspond to various classes, then use
>> > them in operand constraints.
>> >
>> > +You must define the narrowest register class for a register so that
>> > +class either has no subclasses, or that for some mode, the move cost
>> > +between registers within the class are cheaper than moving a register
>> > +in the class to or from memory (@pxref{Costs}).
>> > +
>>
>> I fear this isn't true for some MIPS classes.
>
> I fear the assert will strike then, when there are allocatable
> registers in such a class. :)
>
> You don't happen to have target and options to cc1?
Gah, seems like I'd forgotten the "no subclasses" bit by the time
I started looking at code. Sorry for the false alarm.
Richard
