bytecodealliance/wasmtime
Jan 2026 – Feb 2026
2 Months active
Languages Used
Rust
Technical Skills
compiler designlow-level programmingsystem programmingassembly languageperformance optimizationvector programming
Jimmy Brisson
PROFILE
Jimmy Brisson
Jean Brisson contributed to the bytecodealliance/wasmtime repository by expanding s390x memory addressing and vector instruction support. Over two months, Jean implemented type-safe 20-bit immediate offsets for indexed loads, enhancing memory operand construction and reducing error risk in low-level Rust code. The work preserved existing vector semantics while enabling larger, safer memory accesses. In the following month, Jean added S390x z17 vector instructions, including CLZ and CTZ for 64-bit integers and new blend operations, aligning naming conventions across architectures. These contributions deepened Wasmtime’s system programming capabilities and improved performance optimization for IBM Z workloads through careful, architecture-specific compiler design.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
2Total
Bugs
0
Commits
2
Features
2
Lines of code
3,494
Activity Months2
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238 peopleSame Organization
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Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026In February 2026, delivered S390x z17 vector instruction support for wasmtime, introducing CLZ/CTZ for 64-bit integers and new vector blend/evaluation instructions, significantly expanding IBM Z platform capabilities and performance for Wasmtime workloads. The work included emission of new z17 instructions, cross-architecture naming alignment (blendv), and tests to validate the emission and operator coverage. Collaborated with IBM contributors on the z17 feature (co-authored commits).
1 Commits • 1 Features
Feb 1, 2026In February 2026, delivered S390x z17 vector instruction support for wasmtime, introducing CLZ/CTZ for 64-bit integers and new vector blend/evaluation instructions, significantly expanding IBM Z platform capabilities and performance for Wasmtime workloads. The work included emission of new z17 instructions, cross-architecture naming alignment (blendv), and tests to validate the emission and operator coverage. Collaborated with IBM contributors on the z17 feature (co-authored commits).
February 2026
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly delivery focused on expanding s390x memory addressing capabilities in Wasmtime, delivering a type-safe 20-bit immediate offset path for indexed loads. The change introduces 20-bit immediates by adding dedicated extractors and updating the MemArg constructor to accept 20-bit offsets for reg+reg addressing, enabling larger offsets and reducing potential errors in memory operations. This work improves code generation efficiency on the s390x path and enhances maintainability by clarifying memory operand construction and type-safety. The update preserves existing addressing semantics for vector-related paths, with the note that the '_bias' rule remains unchanged for non-20-bit addressing to avoid regressions in vector instructions.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly delivery focused on expanding s390x memory addressing capabilities in Wasmtime, delivering a type-safe 20-bit immediate offset path for indexed loads. The change introduces 20-bit immediates by adding dedicated extractors and updating the MemArg constructor to accept 20-bit offsets for reg+reg addressing, enabling larger offsets and reducing potential errors in memory operations. This work improves code generation efficiency on the s390x path and enhances maintainability by clarifying memory operand construction and type-safety. The update preserves existing addressing semantics for vector-related paths, with the note that the '_bias' rule remains unchanged for non-20-bit addressing to avoid regressions in vector instructions.
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture100.0%
Performance80.0%
AI Usage30.0%
Skills & Technologies
Programming Languages
Rust
Technical Skills
assembly languagecompiler designlow-level programmingperformance optimizationsystem programmingvector programming
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