Behavioral Semantics

Concept

In hardware-accelerated co-simulation verification, behavioral semantics refers to the architectural behaviors that verification events carry and their mapping to specific microarchitectural components. It is one of three semantic properties (alongside structural and order semantics) exploited by DiffTest-H to reduce communication overhead while preserving instruction-level debuggability, and is concretely realized by the Replay debugging mechanism.

First seen 6/6/2026

Last seen 6/6/2026

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Behavioral Semantics

Definition

In the context of hardware-accelerated processor co-simulation, behavioral semantics denotes the architectural behaviors that verification events convey together with their mapping to specific microarchitectural components. Every event produced by the design under test (DUT) implicitly identifies a particular architectural action and the microarchitectural structure responsible for it.

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RELATIONSHIPS

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DiffTest-H ← uses 100% 1e

DiffTest-H leverages behavioral semantics to enable lightweight debugging.

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

Replay implements behavioral semantics to restore instruction-level debuggability.

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DiffTest-H USES Extracted graph relationship

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

CITATIONS

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[1] Behavioral semantics refers to the architectural behaviors carried by verification events and their mapping to specific microarchitectural components, and can guide debugging by localizing faults more precisely. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[2] By reprocessing only the unfused verification events around the failure point (rather than re-executing the entire DUT), behavioral semantics restores instruction-level behavioral details and pinpoints the faulty instruction and related microarchitectural component, enabling lightweight and effective debugging. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[3] Replay is a lightweight debugging mechanism in DiffTest-H that localizes bugs by reprocessing unfused events around the failure point, addressing range determination via a token-based management mechanism and REF state recovery via a compensation-based checkpoint strategy. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[4] DiffTest-H identifies three semantic properties of verification events — structural, order, and behavioral semantics — and pairs each with a dedicated optimization: Batch (structural), Squash (order), and Replay (behavioral), forming a framework that significantly reduces communication overhead while preserving instruction-level debuggability. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification

[5] Existing fusing optimizations (e.g., N instruction commits into one N-commit event) reduce data transmission volume but discard per-instruction details, weakening instruction-level debuggability; behavioral semantics via Replay addresses this by avoiding a full DUT rerun. DiffTest-H: Toward Semantic-Aware Communication in Hardware-Accelerated Processor Verification