High Quality Content by WIKIPEDIA articles! In the field of
compiler optimizations, available expressions is an analysis
algorithm that determines for each point in the program the set of
expressions that need not be recomputed. Those expressions are said
to be available at such a point. To be available on a program
point, the operands of the expression should not be modified on any
path from the occurrence of that expression to the program point.
The analysis is an example of a forward data flow analysis problem.
A set of available expressions is maintained. Each statement is
analysed to see whether it changes the operands of one or more
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