Compensation-based REF Revert

Concept

A lightweight state-recovery strategy used by the Replay mechanism in DiffTest-H to roll back the reference model (REF) to the latest checkpoint by logging inverse modifications between checkpoints, rather than snapshotting the entire REF.

First seen 6/6/2026

Last seen 6/6/2026

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Compensation-based REF Revert

Overview

Compensation-based REF revert is a state-recovery strategy employed by the Replay lightweight-debugging mechanism in DiffTest-H, a hardware-accelerated processor verification framework. It enables the software reference model (REF) to be efficiently restored to the most recent checkpoint when a fused verification event is found to be buggy, so that the unfused events around the failure point can be reprocessed for debugging.

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Replay (lightweight debugging by event retransmission) ← uses 100% 1e

Replay uses a compensation-based strategy to revert the REF state for reprocessing.

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Replay (lightweight debugging by event retransmission) USES Extracted graph relationship

CITATIONS

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[1] Mismatches may occur at any check, so Replay must revert the REF to the latest checkpoint before reprocessing events. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[2] Directly snapshotting the REF at each checkpoint would be prohibitively expensive, especially in memory usage. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[3] Replay adopts a compensation-based strategy: it records only the modifications between consecutive checkpoints. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[4] When a fused event is found buggy, Replay restores the REF by rolling back these changes. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[5] For example, the original values of memory updates between two checkpoints are logged; reverting simply writes back these logs in reverse order to achieve lightweight state recovery. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[6] Replay addresses two key challenges: (1) how to determine the range of retransmission; (2) how to recover the REF's state for reprocessing. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[7] On the software side, once a fused event mismatches, the REF reverts its state, requests retransmission, and reprocesses the unfused events for debugging. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification