forked from OSchip/llvm-project
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// This file implements the LiveInterval analysis pass. Given some numbering of
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// each the machine instructions (in this implemention depth-first order) an
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// interval [i, j) is said to be a live interval for register v if there is no
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// instruction with number j' > j such that v is live at j' abd there is no
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// instruction with number j' > j such that v is live at j' and there is no
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// instruction with number i' < i such that v is live at i'. In this
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// implementation intervals can have holes, i.e. an interval might look like
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// [1,20), [50,65), [1000,1001).
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