Dataflow Analysis

OVERVIEW

anal-y-sis: an examination of a complex, its elements, and their relations

Webster's Dictionary

An optimizing compiler transforms programs to improve their efficiency without changing their output. There are many transformations that improve efficiency:

• Register allocation: Keep two nonoverlapping temporaries in the same register. Common-subexpression elimination: If an expression is computed more than once, eliminate one of the computations.

• Dead-code elimination: Delete a computation whose result will never be used. Constant folding: If the operands of an expression are constants, do the computation at compile time.

This is not a complete list of optimizations. In fact, there can never be a complete list.

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