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module Register
# a branch must branch to a block.
class Branch < Instruction
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def initialize source , to
super(source)
raise "No block" unless to
@block = to
end
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attr_reader :block
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def to_s
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"Branch: #{block.name}"
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end
alias :inspect :to_s
end
class IsZeroBranch < Branch
end
class IsNegativeBranch < Branch
end
class IsPositiveBranch < Branch
end
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class AlwaysBranch < Branch
end
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end