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Modern Compiler Implementation in C by Maia Ginsburg, Andrew W. Appel

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10

Liveness Analysis

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live: of continuing or current interest

Webster’s Dictionary

The front end of the compiler translates programs into an intermediate language with an unbounded number of temporaries. This program must run on a machine with a bounded number of registers. Two temporaries a and b can fit into the same register, if a and b are never “in use” at the same time. Thus, many temporaries can fit in few registers; if they don’t all fit, the excess temporaries can be kept in memory.

Therefore, the compiler needs to analyze the intermediate-representation ...

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