How to use a fast scratchpad-RAM for fill/spill ?

[Greg McGary]

Daniel Jacobowitz <drow@false.org> writes:

> ... Or you could try telling the entire compiler to treat them as
> registers, instead of just reload.  That's likely to work as well or
> better.

So, I define these as a separate register class, and only the movM
insn patterns get constraints that match them, right?  Anything else?
Should I tack them onto the end of REG_ALLOC_ORDER, or leave them
off?

Greg