Is it possible to port GCC backend to a architecture with very limited hard registers?

[redriver jiang]

Hi all,

Right now I attempts to port the GCC backend to a MCU with very
limited hard registers: only one 8 bit ACC reg, one 16 bit base reg
for addressing, one stats reg.
I searched the GCC backend porting, and seems 68HC1X has the similar
scene, but it use many "ram simulated" register. I wonder that if it
is possbile to provided thislimited 3 register to GCC bankend, and let
all 16bit(HImode), 32bit(SImode) operands spilled to stack.

Thanks!

Redriver