FormaliSE 2026
Sun 12 - Mon 13 April 2026 Rio de Janeiro, Brazil
co-located with ICSE 2026

Satisfiability Modulo Theories (SMT) solvers rely on extensive theory lemma generation in order to find proofs in quantified theories, like the theory of arrays. This means that the solver instantiates thousands of quantifiers during proof search. In practice, abundant quantifier instantiation can lead to divergence. Counterexample guided abstraction refinement (CEGAR) is a common technique for handling complex theory reasoning in software model checking by removing quantified, theory specific facts and selectively reintroducing them to help guide the SMT solver to a proof. We present Yardbird, a CEGAR framework that uses egg, an off-the-shelf e-graph implementation, to find useful quantifier instantiations for bounded model checking of array programs. Yardbird is an extensible framework where domain-specific instantiation strategies can be implemented as simple cost functions without modifying the underlying solver. We evaluate our technique on 187 SV-COMP array benchmarks and compare against Z3’s built-in array theory solver. We show that Yardbird solves 20 benchmarks that Z3’s array theory solver cannot in the time provided. Additionally, in benchmarks where both Z3 and Yardbird succeed, Yardbird reduces array axiom instantiations in 88% of benchmarks by 95% on average.

Mon 13 Apr

Displayed time zone: Brasilia, Distrito Federal, Brazil change

11:00 - 12:30
Session 4: Automated Reasoning, and Program AnalysisResearch Track / FormaliSE Program at Oceania VIII
11:00
30m
Talk
Simple Lambda Lifting: Formalisation in Lean and a new efficient algorithm
Research Track
Tom Levy University of Waikato, Steve Reeves University of Waikato
11:30
30m
Talk
Domain-Guided Quantifier Instantiation with Yardbird
Research Track
Cole Vick University of Texas at Austin, Samuel Thomas The University of Texas at Austin, Texas, USA
12:00
15m
Talk
From Cognition to Coordination: Modeling Agentic Autonomy in Large-Scale Multi-Agent SystemsVirtual Attendance
Research Track
Minu Tiwari Siemens AG, Himanshu Kumar Singh Siemens AG
12:15
15m
Talk
Test Data Selection by Failure Coverage
Research Track
Amani Ayad Mount Saint Vincent University, Ali Mili NJIT