Memory Alignment Constraint

Concept

A memory alignment constraint is a verification constraint that encodes the memory alignment rule for load and store accesses in automatically generated instruction scenarios. It is used to keep randomized programs useful and can be turned off when misaligned-access exceptions need to be exercised.

First seen 5/28/2026

Last seen 6/1/2026

Evidence 4 chunks

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WIKI

Definition

A memory alignment constraint is a constraint used to describe the memory alignment rule for memory load and store operations in automatically generated instruction scenarios for microprocessor verification.

Why it matters

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RELATIONSHIPS

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common instruction scenario base class ← implements 93% 2e

The common instruction scenario base class implements memory alignment rules as constraints.

Exception Handling in Processor Verification ← uses 93% 1e

Memory alignment constraint violations are used to trigger exceptions in processor verification.

LINKED ENTITIES

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common instruction scenario base class IMPLEMENTS Extracted graph relationship

CITATIONS

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[1] Unaligned load/store accesses to data memory trigger an exception. source

[2] Pure random instruction sequences are unlikely to create useful programs, so constraints are used to create random but interesting sequences. source

[3] The common instruction scenario base class can encapsulate shared methods, and relationships between instruction objects can be implemented there as constraints, including the memory alignment rule. source

[4] For exception planning, the memory alignment constraint can be turned off so misaligned memory addresses are used with load and store operations at random times during scenario randomization. source