What Do RTL Repair Benchmarks Actually Measure?

Yeyin Eva Zhu, Rishabh Ranawat · 2026 · arXiv

DOI: 10.48550/arXiv.2610.28595 · open-access PDF

Abstract

RTL repair benchmarks should measure whether a model can fix broken RTL given a specification. To this end, we construct and hash-bind RTLRepairDataset, 5,784 (broken, fixed) training pairs; RTLRepairBench, 459 held-out cases with 374 syntactic and 85 behavioral mutations; and an evaluation harness supporting simulation and formal equivalence. We then use this infrastructure to identify two measurement confounds. First, simulation and formal scoring give opposite signs for the apparent effect of providing a specification in one evaluated cohort; reset-aware rescoring attributes almost all of t

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