chaining constraint
ConceptA chaining constraint is a generation-time rule in the V²PRO self-testing framework that tracks per-lane chain state so randomly generated vector instruction sequences using chained operand data avoid deadlock and can be finalized with any required chain-completing instructions.
First seen 6/1/2026
Last seen 6/1/2026
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chaining constraint
In the V²PRO-specific extensions to the self-testing framework, a chaining constraint is a check applied during random vector instruction generation for sequences that use chained operand data. Its purpose is to prevent deadlock situations, such as all vector lanes waiting for chained data so that no further vector instruction can be issued from the instruction FIFO. [C1]
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1 connectionsRandom vector instruction generation applies chaining constraints to avoid deadlocks in vector lane chaining.
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[1] C1: The chaining constraint is applied during random vector instruction generation to avoid deadlocks where vector lanes wait for chained data and no further instruction is issued from the instruction FIFO. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link
[2] C2: During operand source selection, a chaining source can be randomly selected, and the implementation enforces the constraint by tracking individual chaining states of vector lanes during vector instruction generation. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link
[3] C3: If a vector instruction has a chain input operand, a corresponding source-lane instruction is required to generate the data, and the waiting lane does not execute following instructions until the source data are generated. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link
[4] C4: At the end of sequence generation, the framework emits finalizing vector instructions based on the final chain state to ensure valid execution of generated instruction sequences. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link
[5] C5: For the vector unit described in Fig. 8, both source operands can use chaining on processing lanes L0 and L1, the L/S lane has a single chain source during store operations, and chain data may be broadcast across vector lanes. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link
[6] C6: The source states that multiple small-length vector instructions can serve as chain sources for one long vector instruction, some instructions can execute between chained instructions in certain cases, chained data can be used for broadcast, and chain-state tracking may disable a vector lane as a target for new vector instructions. A Self-Testing Framework for Verification and Validation of a RISC-V-Based System with a Co-processor | International Journal of Parallel Programming | Springer Nature Link