🚀 go-pugleaf

Hello World,

I a trying to adapt GCC to a special microprocessor that doen't have a
divsi3 type instruction, but instead has a divmodsi4 instruction.

The divmodsi4 that the processor offers works with registers, and has 
one constraint:
Given a two operands, say in Ra and Rb, the quotient is put into Ra,
and the modulo into R(a+1).

The problem here is that, for just an ordinary division, a "moving
target" register is clobbered, namely the register one higher than the
numerator operand.

How do I express this in RTL?  (oh, I've already tried quite a few
things... but maybe I'm just lacking the decisive inspiration :-)

Thanks for any hints & help.


Oliver M. Kellogg, Software Eng'r      Deutsche Aerospace AG, Munich, FRG
okellogg@salyko.doit.sub.org     Writing this at home & on my own behalf.