Single Static Assignment

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In practice, this occurs in the presence of switch-statements.

SSA factors the def-use chain over a φ-node, avoiding this pathological case.

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With SSA form, you can ignore those and get a similar level of precision.

Memory usage: Without SSA form, an analysis must store information for every variable at every program point.

SSA form allows a sparse analysis, where an analysis must store information only for every assignment in the program.

With a unique version per assignment, the memory usage of storing the results of an analysis can be considerably lower than using bit-vector or set-based approaches.

In English: When storing the results of your analysis, you can save them much more cheaply in SSA form, from a CPU and memory perspective.

Without SSA, you need a hashtable of variables, with a list of values each.


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