Data dependences, which relate statements that compute data values to statements that use those values, are useful for automating a variety of program-comprehension-related activities, such as reverse engineering, impact analysis, and debugging. Unfortunat

percentage of slices

percent ofstatements

in slice

(0, 20](20, 40]

(40, 60]

1

2

e

e

ic

ic

sl

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slice 3

Figure7:Increaseinthesizesoftheslicesforunzipbyincorporatingdi erenttypesofdatadependencesintotheslices.