Endless Instruction Stream Generation

Technique

Endless Instruction Stream Generation is a processor-verification stimulus technique that presents a finite generated instruction sequence as an unbounded stream, for example by cyclically repeating entries from a Translation Buffer. In the cited cross-level verification work, this style of single endless stream is discussed as a custom, architecture-specific stimulus-generation approach and contrasted with a coverage-guided fuzzing setup that generates separate test cases.

First seen 5/28/2026

Last seen 5/28/2026

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Overview

Endless Instruction Stream Generation is a technique for processor verification in which a finite generated sequence of instructions is made available to a processor as an effectively unbounded instruction stream. In the documented implementation, a Translation Buffer is reset so that it delivers the same instruction sequence as it did immediately after initialization; by cyclic repetition, the buffer provides an endless instruction stream for verification.

Mechanism

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Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing ← compares with 85% 1e

The paper contrasts its approach with the single endless instruction stream generation approach.

Processor-level Input Stimuli Generation implements → 85% 1e

Endless instruction stream generation is a technique for generating processor-level stimuli.

LINKED ENTITIES

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Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing COMPARES_WITH Extracted graph relationship

Processor-level Input Stimuli Generation IMPLEMENTS Extracted graph relationship

CITATIONS

6 sources

6 citations — click to expand

[1] A Translation Buffer can provide an endless instruction stream by cyclically repeating the same instruction sequence after reset. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing

[2] In the RV32I example, a 160-bit fuzzer-generated test vector is loaded into a Translation Buffer whose entries are 32-bit instructions, producing five entries. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing

[3] The broader co-simulation setup must feed the same instruction sequences to a reference ISS and the core under test while supporting arbitrary instruction sequences and potential infinite loops. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing

[4] Register-value comparison is used to detect functional mismatches, but ISS/RTL comparison requires synchronization because pipelined RTL cores do not generally expose a simple instruction-completion signal. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing

[5] The paper characterizes a custom generator for a single endless instruction stream as architecture-specific and requiring significant setup effort. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing

[6] The paper contrasts the single-endless-stream approach with testcase-by-testcase generation that supports arbitrary control flows, including self-loops, and load/store instructions. Efficient Cross-Level Processor Verification using Coverage-guided Fuzzing