Atomic Operations Testing

Concept

Atomic Operations Testing is a verification methodology used to validate the correct behavior of synchronized atomic memory operations in multi-core processor designs. It checks that observed results match the aggregate of the expected atomic operations, and is commonly deployed alongside related tests such as Dekker memory ordering, false-sharing memory stress, and MOESI cache-coherency state-transition checks.

First seen 7/6/2026

Last seen 7/6/2026

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Atomic Operations Testing

Overview

Atomic Operations Testing is a class of functional verification that exercises the atomic memory operations (AMOs) of a processor — such as compare-and-swap, atomic add, atomic load/store — across one or more cores. The defining verification goal, as described in Breker's RISC-V Core & SoC Verification presentation, is to check that the result is the aggregate of synchronized atomic operations performed by the cores under test. This ensures that atomic semantics — indivisibility, ordering, and visibility — are preserved when multiple agents operate on shared memory.

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Cache Coherency TrekApp 2.0 ← implements 88% 1e

Atomics Testing is presented as part of the cache coherency verification suite.

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CITATIONS

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[1] Atomic Operations Testing checks that the result is the aggregate of synchronized atomic operations. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[2] Atomics, loads and stores are not reachable in a register-only test, motivating atomic-operations testing that exercises shared memory. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[3] Atomic Operations Testing is paired with Dekker Memory Ordering and False-Share Memory Stress tests for multi-core coherency verification. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[4] Multi-core cache coherency testing covers planned MOESI state transitions across cores. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[5] Common cache line access reveals deadlock as a real defect class discovered by coherency/atomic stress testing. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[6] Cache Coherency TrekApp 2.0 is part of the Breker SystemVIP library and provides automated coherency test synthesis, including atomic-operations coverage. RISC-V Core & SoC Verification: A New Normal in Verification Techniques

[7] False-share memory stress tests use free-running write/check loops across cores with read/write helper routines to exercise contended cache lines. RISC-V Core & SoC Verification: A New Normal in Verification Techniques