Problem in global register allocation

[Christian Iseli]

> Try changing the mode of operand 2 to HImode.

That might avoid the problem, though I didn't check.

> In general, mixing modes like that in patterns has lead to problems
> in the past and should be avoided.  I've also seen mixing modes like
> that pessimize code, though I didn't investigate why.

Well, it seems I'm not the only one to use such a scheme, the h8300 target
uses it as well, and maybe others too.  The thing is that I'm compiling
for a small 8-bit micro with precious few registers.  Using 2 or even 4
registers when one is plenty is a *bad* thing on such a beast.  I'd rather
try to fix the compiler than put a kludge in the machine description, though
of course, that might not be easy.  Any pointer as to where the problem might
come from would be greatly appreciated...

					Christian