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Small Formulas for Large Programs: On-line Constraint ...

Why Such a Difference? ● Because program analysis systems typically generate highly redundant constraints! Size of simplified **for**mula consistently under 20 while nonsimplified **for**mula have several hundred leaves COMPASS

It's not just Compass ● Measured redundancy of constraints in a different analysis system, SATURN. Similar pattern as in Compass despite attempts to heuristically control **for**mula size. SATURN

- Page 1 and 2: Small Formulas for Large Programs:
- Page 3 and 4: Techniques to Limit Formula Size
- Page 5 and 6: Goal #1: Non-redundancy ● Given f
- Page 7 and 8: An Example enum op_type {ADD=0, SUB
- Page 9 and 10: An Example enum op_type {ADD=0, SUB
- Page 11 and 12: Now that this example has convinced
- Page 13 and 14: Redundant Leaves ● A leaf L is no
- Page 15 and 16: Properties of Simplified Forms ●
- Page 17 and 18: Critical Constraint Idea: Compute a
- Page 19 and 20: Example ● Consider again the form
- Page 21 and 22: Example ● Consider again the form
- Page 23 and 24: Making it Practical 2n 2 ● Worst
- Page 25: Impact on Analysis Scalability Anal
- Page 29: Any questions?