RIXA:
RISC Instruction Set Architecture for Exact Computing
SciSci Inventions, No. 5
October 2025
James Douglas Boyd
Founder, CEO
Invention
RISC instruction set architecture for the Hensel CPU, with assembly code commands and machine code instructions
Institutions
▣ SciSci Research, Inc. (サイサイ・リサーチ)
▣ Future Computing (フューコン), SciSci's high-performance computing project
Discipline
High-performance computing (HPC)
Topics: FC-3-2025 and PFC-3-2025 encoding formats, ARIXA, MRIXA, loading and retrieval, addition and multiplication
Topics
An ISA for Exact Computing
▣ This report is the first on RIXA, the RISC instruction set architecture (ISA) for exact computing. It introduces ARIXA and MRIXA, the assembly language and machine code for the Hensel CPU, with a few rudimentary examples of instructions, such as loading and retrieving operands, addition, and multiplication.
Executive Summary
In hindsight, the Hensel CPU project, which began in May 2025, was nonetheless possible thanks to several academic visits to international mathematics research institutions, during which Boyd accrued some knowledge about p-adic analysis within the context of arithmetic geometry, analytic number theory, and representation theory. These include the Research Institute for Mathematical Sciences (RIMS; 数理解析研究所) in Kyoto, Japan; the Institute for Pure and Applied Mathematics (IMPA; Instituto Nacional de Matemática Pura e Aplicada) in Rio de Janeiro, Brazil, and the Nesin Mathematics Village (Nesin Matematik Köyü) in Şirince, Türkiye.