# Prismio Research

> Measured results and design records from building Prismio. Prismio is a modern systems programming language and LLVM-based compiler designed for performance, memory ergonomics, and zero-cost safety. Every page names the Prismio version it was measured on and links the code that reproduces it.

- Full corpus in one file: https://research.prismio.org/llms-full.txt
- Compiler reference: https://developers.prismio.org/llms.txt
- Language documentation: https://docs.prismio.org/llms.txt
- Licence: Apache-2.0

## Papers

- [Closing the gap to C on wrapping integer loops](https://research.prismio.org/papers/wrapping-integers-and-tight-loops.md): Prismio's Int wraps on overflow and fell 5 to 12 percent behind C on tight loops. Four compiler analyses recover the gap without making overflow undefined.
- [Telling a real benchmark difference from noise](https://research.prismio.org/papers/telling-a-difference-from-noise.md): A verdict rule for short benchmarks that compares both medians and best runs, and why a flat percentage threshold calls ties wins and losses.

## Notes

- [A 2x slowdown with identical machine code](https://research.prismio.org/notes/the-sdk-stamp-that-halved-malloc.md): A repeatable 1.5x to 2.1x slowdown on macOS had identical IR and disassembly. The cause was the SDK version recorded in the executable.
- [Why Prismio's Int is 32 bits and wraps](https://research.prismio.org/notes/int-is-32-bit-and-wraps.md): Three measurements settled that a 32-bit Int costs no sign extension in counted loops, that undefined overflow did not help, and that a wider Int costs 1.33 times.

## Optional

- [About](https://research.prismio.org/about): what is published here and how results are checked
- [Feed](https://research.prismio.org/feed.xml): new pages, Atom