class Vm::Instructions::ArithmeticOperations::Comparison
Attributes
operation[R]
Public Class Methods
new(operation)
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# File lib/hackasm/vm/instructions/arithmetic_operations/comparison.rb, line 9 def initialize(operation) @operation = operation end
operations()
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# File lib/hackasm/vm/instructions/arithmetic_operations/comparison.rb, line 43 def self.operations %w[gt lt eq] end
Public Instance Methods
to_asm()
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# File lib/hackasm/vm/instructions/arithmetic_operations/comparison.rb, line 13 def to_asm if_label = 'c_if_' + SecureRandom.hex(10) else_label = 'c_else_' + SecureRandom.hex(10) %Q{ @SP M=M-1 @SP A=M D=M @SP M=M-1 @SP A=M D=M-D @#{if_label} D;J#{operation.upcase} D=0 @#{else_label} 0;JEQ (#{if_label}) D=-1 (#{else_label}) @SP A=M M=D @SP M=M+1 }.strip end