ff65952a3e
it seems all cpus have them anyway so best use them it was a pain to do this on word level, hard to write, hard to debug and quite unnecessarily slow
40 lines
1.2 KiB
Ruby
40 lines
1.2 KiB
Ruby
module Register
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# SetByte moves a byte into memory from a register.
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# indexes are 1 based !
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class SetByte < Instruction
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# If you had a c array (off int8) and index offset (>0)
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# the instruction would do array[index] = register
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# So SetByte means the register (first argument) moves to the slot (array and index)
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def initialize source , register , array , index
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super(source)
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@register = register
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@array = array
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@index = index
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raise "index 0 " if index == 0
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raise "Not integer or reg #{index}" unless index.is_a?(Numeric) or RegisterValue.look_like_reg(index)
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raise "Not register #{register}" unless RegisterValue.look_like_reg(register)
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raise "Not register #{array}" unless RegisterValue.look_like_reg(array)
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end
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attr_accessor :register , :array , :index
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def to_s
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"SetByte: #{register} -> #{array} [#{index}]"
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end
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end
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# Produce a SetByte instruction.
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# from and to are translated (from symbol to register if neccessary)
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# but index is left as is.
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def self.set_byte source , from , to , index
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from = resolve_to_register from
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index = resolve_index( to , index)
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to = resolve_to_register to
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SetByte.new( source, from , to , index)
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end
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end
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