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node 1 strictly dominates 2, 3, and
Dominance frontiers define the points at which Φ functions are needed. In the above example, when control is passed to node 4, the definition of <code>result</code> used depends on whether control was passed from node 2 or 3. Φ functions are not needed for variables defined in a dominator, as there is only one possible definition that can apply.
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