PLDI 2025
Mon 16 - Fri 20 June 2025 Seoul, South Korea
Tue 17 Jun 2025 10:50 - 11:10 at Orchid - Applications 2

Satisfiability Modulo Theories (SMT) solvers struggle with quantifier reasoning over common data types such as arrays. Counterexample guided abstraction refinement (CEGAR) is a common technique for dealing with complex theory reasoning in software model checking by abstracting away quantified, theory specific facts and selectively reintroducing them to help guide SMT solvers to a proof. We present our work-in-progress, Yardbird, a CEGAR framework that uses egg, an off-the-shelf e-graph implementation, to find useful theory refinements for bounded model checking of array programs. We generate refinements by using theory axioms as rewrite rules in the equality saturation engine. We find theory conflicts by detecting when two e-classes should be merged, and then selecting refinement terms using a custom property-directed cost function. We evaluate our technique on 193 SV-COMP array benchmarks and compare against Z3. We show that Yardbird outperforms Z3 for 26% of benchmarks on verification time and reduces quantifier instantiations in 49% of benchmarks.

Tue 17 Jun

Displayed time zone: Seoul change

10:30 - 12:00
Applications 2EGRAPHS at Orchid
10:30
20m
Talk
eqsat: An Equality Saturation Dialect for Non-destructive Rewriting
EGRAPHS
Jules Merckx Ghent University, Alexandre Lopoukhine University of Cambridge, Samuel Coward Imperial College London, UK / Intel Corporation, Jianyi Cheng University of Edinburgh, UK, Bjorn De Sutter Ghent University, Belgium , Tobias Grosser University of Cambridge
Pre-print Media Attached
10:50
20m
Talk
Hatching Theory Instantiations with Yardbird
EGRAPHS
Cole Vick University of Texas at Austin, Samuel Thomas The University of Texas at Austin, Texas, USA
Media Attached
11:10
20m
Talk
Automated High-Level Synthesis Design Modularization via E-Graph Anti-Unification
EGRAPHS
Andy Wanna Georgia Institute of Technology, Cong "Callie" Hao Georgia Institute of Technology, Theo Drane AMD
Media Attached