custom opcode space (custom-0 through custom-3)

Concept

First seen 8/28/2026

Last seen 8/28/2026

Evidence 1 chunks

NEIGHBORHOOD

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3 connections

RISC-V part of → 97% 1e

The custom-0 through custom-3 opcode spaces are defined in the RISC-V specification as reserved for custom extensions.

Custom RISC-V instructions should use the reserved custom opcode spaces.

ISA ← mentions 95% 1e

The ISA specification reserves the custom-0 through custom-3 opcode spaces for custom extensions.