Temporary Allocation

Registers are allocated and released for the temporary storage of intermediate computation through two simple functions.

• int get_register(): Allocates a free register from the register pool (R0 - R19) and returns the index of the register, returns -1 if no free register is available.
• int free_register(): Frees the last register that was allocated,returns 0 if success, returns -1 if the function is called with none of the registers being allocated.