OpenVADL/openvadl
Mar 2025 – Oct 2025
8 Months active
Languages Used
DoxygenLaTeXMakefileMarkdownShellVADLVHDLVHDL-like
Technical Skills
Compiler DesignDSL DevelopmentDocumentationDocumentation GenerationDoxygenEmbedded Systems
Andreas Krall
PROFILE
Andreas Krall
Andi contributed to the OpenVADL/openvadl repository by developing and refining architecture definitions, instruction set specifications, and documentation systems for RISC-V, AArch64, and VarRISC ISAs. Leveraging skills in VHDL, LaTeX, and assembly language, Andi implemented core ISA features, expanded tutorial and reference manual tooling, and improved cross-platform documentation with Doxygen. The work included end-to-end instruction modeling, encoding corrections, and bug fixes that enhanced reliability and maintainability. Andi’s technical approach emphasized correctness, compatibility with toolchains like LLVM, and onboarding efficiency, resulting in a robust, extensible codebase that supports ongoing ISA evolution and streamlined developer integration.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
111Total
Bugs
20
Commits
111
Features
37
Lines of code
18,579
Activity Months8
Your Network
19 people
Work History
October 2025
7 Commits • 2 Features
Oct 1, 2025OpenVADL/openvadl — October 2025: This month focused on correctness, compatibility, and extended target support across AArch64 and VarRISC backends. Key changes include fixes to memory access encoding using W registers, restoration of TableGen compatibility for AArch64 MOV instructions, correction of movn encoding with W registers, removal of an erroneous shift in VarRISC offsetS sign-extension, introduction of a VarRISC32 Mnemonic model with enhanced assembly formatting, and extension of AArch64 with a dedicated X-subset variant including rev32 support.
7 Commits • 2 Features
Oct 1, 2025OpenVADL/openvadl — October 2025: This month focused on correctness, compatibility, and extended target support across AArch64 and VarRISC backends. Key changes include fixes to memory access encoding using W registers, restoration of TableGen compatibility for AArch64 MOV instructions, correction of movn encoding with W registers, removal of an erroneous shift in VarRISC offsetS sign-extension, introduction of a VarRISC32 Mnemonic model with enhanced assembly formatting, and extension of AArch64 with a dedicated X-subset variant including rev32 support.
October 2025
September 2025
6 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for OpenVADL/openvadl focusing on AArch64 syntax and encoding improvements, consolidating bug fixes and maturity of codegen.
September 2025
6 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for OpenVADL/openvadl focusing on AArch64 syntax and encoding improvements, consolidating bug fixes and maturity of codegen.
August 2025
1 Commits
Aug 1, 2025Month: 2025-08 — Focused work in OpenVADL/openvadl on enhancing AArch64 ISA accuracy. Delivered a targeted bug fix for the Add/Sub shifted register format by ensuring the W(rm) operand is correctly handled, along with proper type casting for shift operations. This improvement strengthens ISA correctness and reduces risk of misinterpretation in downstream tooling. No new features were released this month; all efforts contributed to stability and correctness.
1 Commits
Aug 1, 2025Month: 2025-08 — Focused work in OpenVADL/openvadl on enhancing AArch64 ISA accuracy. Delivered a targeted bug fix for the Add/Sub shifted register format by ensuring the W(rm) operand is correctly handled, along with proper type casting for shift operations. This improvement strengthens ISA correctness and reduces risk of misinterpretation in downstream tooling. No new features were released this month; all efforts contributed to stability and correctness.
August 2025
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for OpenVADL/openvadl: Focused on stabilizing the AArch64 backend's interaction with the LLVM toolchain through a critical bug fix in assembly printing. Delivered a fix for LLVM-compatible LDR immediate shift printing on AArch64 by using AccSize::$m.accsize instead of a hardcoded decimal size, validated in the patchset and linked to commit 3d7284c56097ea6b59f547535d58e2579dc71983.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for OpenVADL/openvadl: Focused on stabilizing the AArch64 backend's interaction with the LLVM toolchain through a critical bug fix in assembly printing. Delivered a fix for LLVM-compatible LDR immediate shift printing on AArch64 by using AccSize::$m.accsize instead of a hardcoded decimal size, validated in the patchset and linked to commit 3d7284c56097ea6b59f547535d58e2579dc71983.
June 2025
10 Commits • 2 Features
Jun 1, 2025In June 2025, delivered notable features and stability improvements for the OpenVADL/openvadl project. Key accomplishments include VarRISC ISA extension with register handling improvements and a refactor of immediate value handling to enable more flexible and correct VarRISC modeling. Completed substantial AArch64 architecture enhancements with pseudo-instructions for multiplication and shifts, comprehensive encoding/formatting improvements, corrected cast behavior for word-size operations, and refined condition flags handling and instruction annotations. Addressed several correctness and edge-case issues to improve reliability and maintainability across architectures.
10 Commits • 2 Features
Jun 1, 2025In June 2025, delivered notable features and stability improvements for the OpenVADL/openvadl project. Key accomplishments include VarRISC ISA extension with register handling improvements and a refactor of immediate value handling to enable more flexible and correct VarRISC modeling. Completed substantial AArch64 architecture enhancements with pseudo-instructions for multiplication and shifts, comprehensive encoding/formatting improvements, corrected cast behavior for word-size operations, and refined condition flags handling and instruction annotations. Addressed several correctness and edge-case issues to improve reliability and maintainability across architectures.
June 2025
May 2025
37 Commits • 20 Features
May 1, 2025May 2025 OpenVADL monthly summary: Delivered cross-ISA progress with completed RISC-V RV32 CSR Vadl support and cleanup, and launched substantial AArch64 ISA expansion across core instruction families and Vadl scaffolding. Implemented end-to-end MOVKNZ, Add/Sub carry, branches and memory operations, shift/MovK, mul/div, and advanced bitfield operations, alongside base ISA Vadl completion. Improved encoding/decoding reliability via imm13 improvements. Achieved significant stability and quality gains through targeted bug fixes and cleanup, and advanced system/ABI readiness with V-RISC ABI and AArch64 exceptions/system instructions, plus HLT/YIELD and BTI/REV updates. These efforts broaden ISA coverage, improve reliability, and accelerate testing and integration for future releases and customer deployments.
May 2025
37 Commits • 20 Features
May 1, 2025May 2025 OpenVADL monthly summary: Delivered cross-ISA progress with completed RISC-V RV32 CSR Vadl support and cleanup, and launched substantial AArch64 ISA expansion across core instruction families and Vadl scaffolding. Implemented end-to-end MOVKNZ, Add/Sub carry, branches and memory operations, shift/MovK, mul/div, and advanced bitfield operations, alongside base ISA Vadl completion. Improved encoding/decoding reliability via imm13 improvements. Achieved significant stability and quality gains through targeted bug fixes and cleanup, and advanced system/ABI readiness with V-RISC ABI and AArch64 exceptions/system instructions, plus HLT/YIELD and BTI/REV updates. These efforts broaden ISA coverage, improve reliability, and accelerate testing and integration for future releases and customer deployments.
April 2025
23 Commits • 6 Features
Apr 1, 2025OpenVADL OpenVADL — April 2025 monthly summary. This period focused on establishing robust documentation tooling, laying the foundation for ISA/RefMan, and advancing the Tutorial subsystem, with notable gains in maintainability, onboarding, and architectural clarity across the project. Key features delivered: - Documentation tooling and Doxygen setup: Apple Silicon compatible docs setup using a symbolic link for Doxygen docs, improving cross-platform accessibility and build reliability. - RefMan ISA Documentation and memory/PC/instruction definitions: Initiated RefMan ISA with PC definitions, memory and instruction sets, operation annotations, memory declarations, and exception handling; implemented related fixes to RefMan to enable a stable ISA baseline. - Tutorial: ABI/Relocations/License and Typo Fixes: Completed major ABI coverage and relocations, added license information for tutorials, and corrected typos, improving clarity and licensing compliance. - Tutorial subsystem milestones complete: Milestones for tensor/forall, assembly description, MiA definition, and atomic instructions/operation sets achieved, accelerating tutorial tooling maturity. - Sys: VarRisc added: Introduced a variable-length RISC processor variant to support flexibility in instruction encoding and richer ISA experimentation. - Sys/v-risc: copyright header added: Documentation hygiene improvements across system module. Major bugs fixed: - Sys/v-risc: fixed wrong comment, improving code readability and correctness. - Docs: README link fix, ensuring documentation is accurately referenced and navigable. Overall impact and accomplishments: - Built a solid foundation for documentation and ISA design, enabling easier onboarding, external collaboration, and long-term maintainability. - Progressed toward a complete ISA implementation and a mature tutorial system, reducing future rework and accelerating feature delivery. - Strengthened code hygiene and licensing compliance across tutorials and system components. Technologies/skills demonstrated: - Doxygen tooling and Apple Silicon compatibility, cross-platform documentation practices - RefMan ISA concepts: PC, memory, instruction definitions, operation annotations, raises/exception handling - RISC architecture exploration: VarRisc integration and v-risc hygiene - Tutorial system architecture: ABI/relocations, MiA, tensors/forall, assembly descriptions - Licensing, documentation hygiene, and CI-related commit hygiene (CI SKIP in several commits)
23 Commits • 6 Features
Apr 1, 2025OpenVADL OpenVADL — April 2025 monthly summary. This period focused on establishing robust documentation tooling, laying the foundation for ISA/RefMan, and advancing the Tutorial subsystem, with notable gains in maintainability, onboarding, and architectural clarity across the project. Key features delivered: - Documentation tooling and Doxygen setup: Apple Silicon compatible docs setup using a symbolic link for Doxygen docs, improving cross-platform accessibility and build reliability. - RefMan ISA Documentation and memory/PC/instruction definitions: Initiated RefMan ISA with PC definitions, memory and instruction sets, operation annotations, memory declarations, and exception handling; implemented related fixes to RefMan to enable a stable ISA baseline. - Tutorial: ABI/Relocations/License and Typo Fixes: Completed major ABI coverage and relocations, added license information for tutorials, and corrected typos, improving clarity and licensing compliance. - Tutorial subsystem milestones complete: Milestones for tensor/forall, assembly description, MiA definition, and atomic instructions/operation sets achieved, accelerating tutorial tooling maturity. - Sys: VarRisc added: Introduced a variable-length RISC processor variant to support flexibility in instruction encoding and richer ISA experimentation. - Sys/v-risc: copyright header added: Documentation hygiene improvements across system module. Major bugs fixed: - Sys/v-risc: fixed wrong comment, improving code readability and correctness. - Docs: README link fix, ensuring documentation is accurately referenced and navigable. Overall impact and accomplishments: - Built a solid foundation for documentation and ISA design, enabling easier onboarding, external collaboration, and long-term maintainability. - Progressed toward a complete ISA implementation and a mature tutorial system, reducing future rework and accelerating feature delivery. - Strengthened code hygiene and licensing compliance across tutorials and system components. Technologies/skills demonstrated: - Doxygen tooling and Apple Silicon compatibility, cross-platform documentation practices - RefMan ISA concepts: PC, memory, instruction definitions, operation annotations, raises/exception handling - RISC architecture exploration: VarRisc integration and v-risc hygiene - Tutorial system architecture: ABI/relocations, MiA, tensors/forall, assembly descriptions - Licensing, documentation hygiene, and CI-related commit hygiene (CI SKIP in several commits)
April 2025
March 2025
26 Commits • 6 Features
Mar 1, 2025March 2025: Delivered substantial enhancements to the VADL project (OpenVADL/openvadl), focusing on reference manual development, styling maintainability, core Refman structure, constants/expressions, CSR planning, and licensing/docs. The work establishes a robust documentation and reference framework, improves maintainability, and provides reusable components for faster onboarding and API usage.
March 2025
26 Commits • 6 Features
Mar 1, 2025March 2025: Delivered substantial enhancements to the VADL project (OpenVADL/openvadl), focusing on reference manual development, styling maintainability, core Refman structure, constants/expressions, CSR planning, and licensing/docs. The work establishes a robust documentation and reference framework, improves maintainability, and provides reusable components for faster onboarding and API usage.
Activity
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Quality Metrics
Correctness92.8%
Maintainability91.6%
Architecture90.8%
Performance85.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
DoxygenLaTeXMakefileMarkdownShellVADLVHDLVHDL-like
Technical Skills
Architecture DefinitionArchitecture Description LanguageArchitecture-specific optimizationAssembly LanguageAssembly languageBuild System ConfigurationCPU ArchitectureCPU Architecture DesignCode CorrectionCompiler DesignCompiler DevelopmentCompiler designCompiler developmentComputer ArchitectureComputer architecture
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