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Line 22: </table> The dataflow equations used for a given basic block ''s'' and exiting block ''f'' in live variable analysis are (GEN(s) means the set of variables used in s before any assignment; KILL (s) means the set of variables assigned a value in s (in many books, KILL (s) is also defined as the set of variables assigned a value in s ''before any use'', but this doesn't change the solution of the dataflow equation): :<math> {\mbox{LIVE}}_{in}[s] = {\mbox{GEN}}[s] \cup ({\mbox{LIVE}}_{out}[s] - {\mbox{KILL}}[s])

Live-variable analysis: Difference between revisions