Speculative Instruction Issue

Concept

Speculative Instruction Issue is an Open Vector Interface (OVI) behavior in which vector instructions can be sent by the scalar core to the Vector Processing Unit before they are finally confirmed. In OVI, the ISSUE sub-interface carries the instruction request and operands/configuration, while the DISPATCH sub-interface later confirms or kills issued instructions, enabling this speculative flow.

First seen 5/27/2026

Last seen 5/27/2026

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WIKI

Overview

Speculative Instruction Issue is a mechanism supported by the Open Vector Interface (OVI) for vector instruction flow between a scalar core and a Vector Processing Unit (VPU). In the cited OVI description, the scalar core uses the ISSUE sub-interface to send a request together with the instruction, configuration values, and scalar input. A separate DISPATCH sub-interface then confirms or kills issued instructions, which is what enables speculative issue of vector instructions.

Role in OVI

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RELATIONSHIPS

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Open Vector Interface (OVI) part of → 92% 1e

OVI enables speculative issue of vector instructions via the DISPATCH sub-interface

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CITATIONS

3 sources

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[1] OVI's ISSUE sub-interface is used by the core to send a request together with the instruction, configuration values, and scalar input. source

[2] OVI's DISPATCH sub-interface confirms or kills all issued instructions, enabling speculative issue of vector instructions. source

[3] The ISSUE interface uses a credit system for handshaking between the VPU and the scalar core. source