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Endless Instruction Stream

Concept

An endless instruction stream is a verification setting in which instructions are generated and executed as a continuing stream rather than as isolated test cases. In the cited DATE 2022 paper, this setting makes static randomized generation problematic over time, motivating Coverage-guided Aging to reduce coverage gaps and rebalance exercised instruction-group combinations.

First seen 5/29/2026
Last seen 6/5/2026
Evidence 3 chunks
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WIKI

Endless Instruction Stream

An endless instruction stream is a processor-verification setting in which generation is considered as a continuing stream of instructions, rather than as a sequence of isolated individual test cases. In this setting, readjustment of the generation strategy after each run is not available in the same way, so the long-term behavior of the generator becomes critical.[C1]

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RELATIONSHIPS

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Cross-level processor verification via endless randomized instruction stream generation with coverage-guided aging ← uses 100% 5e
The approach generates an endless and unrestricted instruction stream.
InstrGen ← implements 100% 2e
InstrGen generates endless instruction streams without restrictions.
Instruction Generator (InstrGen) ← implements 95% 1e
InstrGen produces endless instruction streams.
Control and Status Registers (CSRs) uses → 90% 1e
Endless instruction streams include arbitrary CSR instructions without restrictions.
InstrGen (Instruction Generator) ← implements 100% 1e
InstrGen generates endless instruction streams.

LINKED ENTITIES

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Cross-level processor verification via endless randomized instruction stream generation with coverage-guided aging USES Extracted graph relationship
InstrGen IMPLEMENTS Extracted graph relationship

CITATIONS

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4 citations — click to collapse
[1] An endless instruction stream is treated differently from individual cases because readjustment after each run is not possible in the same way. Cross-Level Processor Verification via Endless Randomized Instruction Stream Generation with Coverage-guided Aging
[2] The random generator is based on a static randomized test strategy that does not change over time and tends to favor specific test state spaces. Cross-Level Processor Verification via Endless Randomized Instruction Stream Generation with Coverage-guided Aging
[3] In the reported comparison, the plain random generator showed strong peaks and gaps; for example, 'Special & System : Special & System' was barely seen while 'Other : Other' was executed very often. Cross-Level Processor Verification via Endless Randomized Instruction Stream Generation with Coverage-guided Aging
[4] The Coverage-guided Aging-enhanced generator produced weaker peaks, executed every group, and gave a more balanced result with no visible gaps. Cross-Level Processor Verification via Endless Randomized Instruction Stream Generation with Coverage-guided Aging