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Andrew Waterman

PROFILE

Andrew Waterman

Andrew contributed to the riscv/riscv-isa-manual and related repositories by delivering deep, ongoing improvements to RISC-V ISA documentation and build systems. He focused on clarifying memory operation semantics, refining PMP and C-extension encoding descriptions, and aligning documentation with evolving hardware and architectural standards. Using AsciiDoc, Makefile, and Shell, Andrew consolidated and standardized technical content, removed outdated references, and enhanced navigation and cross-referencing to reduce ambiguity for implementers. His work improved onboarding and long-term maintainability by ensuring documentation accurately reflected current specifications, while also strengthening CI/CD reliability and documentation hygiene through build process enhancements and rigorous technical writing practices.

Overall Statistics

Feature vs Bugs

77%Features

Repository Contributions

86Total
Bugs
5
Commits
86
Features
17
Lines of code
2,743
Activity Months12

Work History

October 2025

7 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for riscv/riscv-isa-manual: Delivered comprehensive documentation improvements focused on accuracy and clarity within the RISC-V ISA manual. Improvements covered memory operation semantics for wide FP loads/stores, instruction fetch ordering, SMEP, and Zicond rationale relocation, plus privileged spec preface updates, punctuation corrections, and wavedrom file cleanup. Established a formal Rationale appendix and relocated Zicond rationale to it, enhancing long-term maintainability. No code changes or core implementations were touched; impact is in reduced interpretation risk, clearer guidance for implementers, and improved contributor onboarding.

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025: Delivered PMP L Bit Clarification in the RISC-V Manual (riscv/riscv-isa-manual). Clarified that R/W/X permissions are enforced on M-mode accesses when the L bit is set, improving accuracy and clarity of memory access controls in the ISA manual. This reduces ambiguity for implementers and readers and aligns documentation with hardware semantics. No major bugs fixed this month. Technologies demonstrated: ISA spec refinement, precise technical writing, and Git-based traceability (commit 73b7dc8bfc0053bda1fc7a26585be96fb9afc816).

August 2025

6 Commits • 1 Features

Aug 1, 2025

Delivered RISC-V ISA Manual Documentation Quality Improvements for riscv/riscv-cheri in Aug 2025. Focused on clarity and maintainability across critical areas including superpage sizes, dependency accuracy, and instruction/translation rule descriptions; removed outdated references; and enhanced build/docs hygiene.

July 2025

9 Commits • 2 Features

Jul 1, 2025

July 2025 — riscv/riscv-cheri: Delivered release process enhancements and substantial RISC-V ISA documentation clarifications to improve release quality, developer guidance, and maintainability. The work reduces ambiguity for implementers, improves release traceability, and showcases solid tooling and ISA-domain expertise.

June 2025

7 Commits • 2 Features

Jun 1, 2025

June 2025 (2025-06) monthly summary for riscv/riscv-cheri: Delivered focused documentation improvements to the RISC-V C-extension and PMP encoding constraints, enhancing accuracy, clarity, and maintainability while aligning with current architecture. Key updates include explicit C.LI/C.LUI/C.ADDI encoding descriptions, refined NOP/HINT behavior, updated shift-related hints, and removal of obsolete RV128 references; plus PMP XLEN/MXLEN constraint clarifications. Associated commits include updates to C.LI/C.LUI/C.ADDI hints and purge of RV128 references, and a PMP documentation cleanup.

May 2025

4 Commits • 1 Features

May 1, 2025

May 2025: Documentation-focused iteration for riscv/sdtrigpend aimed at improving ISA docs accuracy and readability. Delivered consolidated cleanup and clarifications across multiple ISA files, including colophon simplification, CSR table updates, and rounding-mode clarification; removed outdated/non-normative chapters to tighten scope. Key commits include: a0035dc4bf6d254f5a65a56b2e8895cce79ece17 (Remove outdated text, #2015); c1662f6aec4a17fff97abe45336c531c478c7761 (Add srmcfg to CSR table, #2035); 5953d84f867326a438285258d5d634e699b44353 (Avoid describing fixed-point RDN rounding mode as truncation, #2046); 01e31a074bd12db11b230e0e9ac95e29b9b244cd (Delete non-normative extensions and history chapters, #2048).

April 2025

25 Commits • 4 Features

Apr 1, 2025

April 2025 monthly summary for riscv/sdtrigpend: The focus this month was a comprehensive documentation cleanup and refinement aligned with the current RISC-V baseline, delivering clearer, more consistent guidance while removing outdated references. Key work spanned large-scale content cleanup, targeted bug fixes in instruction listings, and targeted ISA/assembly clarifications, supported by refactoring and encoding proposal cleanup to streamline future maintenance.

March 2025

5 Commits • 1 Features

Mar 1, 2025

March 2025: RISC-V sdtrigpend documentation and spec clarifications were delivered to improve consistency, reduce ambiguity, and guide future implementation. Consolidated clarifications across memory ordering (AMOCAS), hgatp handling, SC protection checks, Sv39 extension terminology, and segment fault behavior for segment loads. The work strengthens reliability, onboarding, and cross-team alignment without introducing code changes.

February 2025

3 Commits

Feb 1, 2025

February 2025: riscv/sdtrigpend documentation improvements focusing on misa CSR, Zvfh instruction set, and RNMI terminology. Delivered clearer ISA references, corrected behavior notes, and consistent terminology across the spec to reduce ambiguity for implementers and maintainers.

January 2025

11 Commits • 1 Features

Jan 1, 2025

January 2025: Delivered documentation improvements for riscv/sdtrigpend with robust cross-references and navigation enhancements, reducing maintenance risk and improving developer onboarding.

November 2024

5 Commits • 1 Features

Nov 1, 2024

November 2024 focused on documentation quality and alignment for riscv/sdtrigpend to reduce onboarding friction and support the v1.14-draft release. Delivered consolidated documentation across Privilege Extensions and CSR Tables, including extension naming conventions and CSR vector registers, with targeted terminology standardization. No code changes were merged this month; the impact is clearer developer guidance, reduced ambiguity, and a stronger foundation for upcoming feature work and audits.

October 2024

3 Commits • 2 Features

Oct 1, 2024

2024-10 Monthly Summary: Delivered cross-ISA FP mnemonic documentation alignment and a code cleanup in two RISCV-related repositories, plus a targeted bug fix for FCSR access under Zfinx. The work improves cross-architecture clarity, code maintainability, and FP state handling reliability, directly supporting safer FP operation guidance and smoother contributor onboarding.

Activity

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Quality Metrics

Correctness99.6%
Maintainability99.6%
Architecture99.4%
Performance98.8%
AI Usage20.0%

Skills & Technologies

Programming Languages

AsciiDocC++EDNMakefileMarkdownShelladoc

Technical Skills

Build SystemsCI/CDCompiler DevelopmentDocumentationDocumentation ManagementEmbedded SystemsRISC-V ArchitectureRISC-V SimulationRISC-V specificationsSystem ArchitectureTechnical DocumentationTechnical Writingdocumentationtechnical writing

Repositories Contributed To

4 repos

Overview of all repositories you've contributed to across your timeline

riscv/sdtrigpend

Oct 2024 May 2025
7 Months active

Languages Used

adocAsciiDocEDNMarkdown

Technical Skills

DocumentationSystem ArchitectureTechnical WritingRISC-V ArchitectureTechnical DocumentationDocumentation Management

riscv/riscv-cheri

Jun 2025 Aug 2025
3 Months active

Languages Used

adocAsciiDocMakefileShellEDN

Technical Skills

DocumentationTechnical WritingBuild SystemsCI/CDRISC-V ArchitectureRISC-V specifications

riscv/riscv-isa-manual

Sep 2025 Oct 2025
2 Months active

Languages Used

adocEDN

Technical Skills

DocumentationTechnical Writing

OpenXiangShan/riscv-isa-sim

Oct 2024 Oct 2024
1 Month active

Languages Used

C++

Technical Skills

Compiler DevelopmentEmbedded SystemsRISC-V ArchitectureRISC-V Simulation

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