Notes & Code

Notes & Code

Plates for compiler & pianoforte, engraved by Paulo Matos, Nuremberg

Latest Faster, With Guardrails (Pl. XXIV, 25 Sep)On the bench Rightkey and PetoVita

x86-64 guest

FEX-Emu IR

ARM64 host

  1. fld [rsp]
  2. fsincos
  3. fmul st0, st0
  4. fxch
  5. fmul st0, st0
  6. faddp
  1. PushStack %10 i128
  2. F80SINCOSStack
  3. F80MulStack #0x0, #0x0
  4. F80StackXchange #0x1
  5. F80MulStack #0x0, #0x0
  6. F80AddStack #0x1, #0x0
translated code runs natively
Fig. 1 Section through the translator. The x87 code (a) from FEX x87 Stack Optimization, Pl. XI, becomes FEX-Emu’s intermediate representation (b), which is compiled to ARM64 at run time (c).
88
Fig. 2 Elevation of a beginning. Middle C at the first lesson, January 2022 (a); the first public performance, eight months later (b).

Section A–AIndex of plates

  1. Faster, With Guardrails8 min

  2. What’s in a vow? A language for the future of agentic coding7 min

  3. Pewpew: the terminals are down!8 min

  4. How fast do you want it?5 min

  5. Hello and a Quick Comments Test1 min

From the notes

  1. Introducing Musiker: An Interactive Timeline of Classical MusicPresto, 2 min

All 24 plates, 2018–2026 or subscribe by RSS code   notes

I’m Paulo Matos, a software engineer in Nuremberg. I work on compilers and dynamic binary translation as a freelance consultant with Igalia; my current focus is FEX-Emu, which runs x86 and x86-64 applications on ARM64, mainly games. By night I play the piano.

This site is where I share technical notes, project updates, and occasional tangents about the things I’m learning. Think of it as a public notebook: part documentation, part exploration.

Engraver
Paulo Matos, Nuremberg
Plates
I–XXIV (24)
Period
2018–2026
Code
22 plates
Notes
2 plates
Latest
, Faster, With Guardrails 25 Sep 2026
Works
Rightkey, PetoVita
Link Log
101 references

Detail BWorks in progress

On the bench, as listed by ls ~/building

RightkeyLiveEvery practice session, remembered. A calm practice log for musicians. Time your sessions, track your repertoire, and watch the hours add up, with no streaks and no pressure. rightkey.app PetoVitaLiveYour life story, one question at a time. A story journal that emails you one question a week and turns your replies into a life narrative worth handing down. petovita.com

Section C–CFurther reading

Catalogue Blog Technical deep-dives into compiler internals, WebAssembly, and low-level systems, and notes from the piano bench Register Link Log Interesting reads, tools, and resources I’ve collected along the way Particulars About me Compilers, binary translation, the piano, running and sim racing

Want to know more? Check out the About page, or find me on GitHub.