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module Risc
# RegToSlot moves data into memory from a register.
# SlotToReg moves data into a register from memory.
# Both use a base memory (a register)
# This is because that is what cpu's can do. In programming terms this would be accessing
# an element in an array, in the case of RegToSlot setting the register in the array.
# btw: to move data between registers, use Transfer
class RegToSlot < Setter
# Produce a RegToSlot instruction.
# From and to are registers
# index may be a Symbol in which case is resolves with resolve_index.
# The slot is ultimately a memory location, so no new register is created
def self.reg_to_slot( source , from , to , index )
raise "Not register #{to}" unless RegisterValue.look_like_reg(to)
index = to.resolve_index(index) if index.is_a?(Symbol) source, from , to , index)