ALU

Concept

In the provided RISC-V microarchitecture verification evidence, the ALU is discussed as a processor submodule whose bugs should be found before full-system bring-up. ALU-related changes, including conflicts introduced by custom instructions, can expand verification scope and require re-verification of impacted processor functionality.

First seen 5/27/2026

Last seen 5/27/2026

Evidence 1 chunks

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WIKI

ALU

Role in processor verification

The evidence treats the ALU as a processor submodule or implementation area that must be validated before integration into a larger processor design. It notes that discovering an ALU bug only when booting Linux would be difficult, which motivates verification earlier in the development flow. [C1]

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Processor Verification ← uses 85% 1e

ALU submodules must be formally verified before integration to avoid discovering bugs late.

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Processor Verification USES Extracted graph relationship

CITATIONS

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[1] C1: The ALU is discussed as a processor submodule or implementation area whose bugs should be found before full-system Linux bring-up. RISC-V Microarchitecture Verification Approaches

[2] C2: Formal verification exhaustively explores input combinations against ISA-specified behavior, while simulation is needed for full processor module validation, SoC integration, and running software on the device under test. RISC-V Microarchitecture Verification Approaches

[3] C3: Teams commonly compare implemented behavior against a reference model and analyze differences between reference and RTL behavior when specifications are imprecise. RISC-V Microarchitecture Verification Approaches

[4] C4: Custom RISC-V instructions increase verification scope, particularly when changes touch pipeline control, ALU conflicts, cache behavior, or load-store paths. RISC-V Microarchitecture Verification Approaches

[5] C5: Verification is never truly complete; coverage alone is insufficient for processors because instruction sequences and dynamic pipeline events must also be considered. RISC-V Microarchitecture Verification Approaches