Execution
Consider the sequential execution of the list of statements, s(i), and what can now be observed as the computation at statement, j:
- A definition at statement s(i) with i < j is alive at j, if it has a use at a statement s(k) with k ≥ j. The set of alive definitions at statement i is denoted as A(i) and the number of alive definitions as |A(i)|. (A(i) is a simple but powerful concept: theoretical and practical results in space complexity theory, access complexity(I/O complexity), register allocation and cache locality exploitation are based on A(i).)
- A definition at statement s(i) kills all previous definitions (s(k) with k < i) for the same variables.
Read more about this topic: Use-define Chain
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