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