Working on G# (GSharp), a C# → CUDA C++ AOT transpiler built on Roslyn source generators (private while in development).
C# / .NET · CUDA · compilers · multi-precision arithmetic

Kassyi.Generators.DependencyProperty

The predecessor of G# and the first of my zero-allocation series: a Roslyn incremental source generator for dependency properties, routed events and weak events (WPF / UWP / WinUI / Uno / Avalonia / MAUI).

• Zero Gen2 GC and up to 30% faster generation than upstream, so the IDE does not lag while typing
• Streams formatted code through ref struct scopes instead of building and normalizing syntax trees
• Reports invalid callbacks as compile-time errors instead of failing silently

ThumbHash Optimized

A rewrite of the ThumbHash image placeholder encoder and decoder in TypeScript, benchmarked against the original in the browser.

• Encode about 6.3x and decode about 13.6x faster than the original (Chrome, Ryzen 9 7900X)
• Folds the DCT by symmetry, processes color channels separately, packs channels into one register (SWAR) and uses lookup tables
• Generates the unrolled hot loops from TypeScript generators and EJS templates, so the source stays readable

N3-PDF (open the app)

A web app that lays out addresses for Nagagata 3 (長形3号, the standard Japanese business envelope, 120 × 235 mm) and outputs a print-ready PDF in the browser.

• Live PDF preview while typing (React 19, TypeScript, @react-pdf/renderer)
• Fills in the address from the postal code
• Converts numbers and hyphens for vertical Japanese writing

The benchmarks in the projects above were measured on a Ryzen 9 7900X, which this CPU replaced.