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About: Reaching definition     Goto   Sponge   NotDistinct   Permalink

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In compiler theory, a reaching definition for a given instruction is an earlier instruction whose target variable can reach (be assigned to) the given one without an intervening assignment. For example, in the following code: d1 : y := 3d2 : x := y d1 is a reaching definition for d2. In the following, example, however: d1 : y := 3d2 : y := 4d3 : x := y d1 is no longer a reaching definition for d3, because d2 kills its reach: the value defined in d1 is no longer available and cannot reach d3.