Amir Ayupov (@disruptnhandlr) / X

Amir Ayupov

6,885 posts

Amir Ayupov

@disruptnhandlr

LLVM BOLT @ Meta, ex-CPU R&D (APX) @ Intel

Joined December 2009

Amir Ayupov
@disruptnhandlr
Nov 7, 2025
If a compiler job requires grinding these days I probably wouldn’t get one. All that was necessary 5-10 years ago seemed straightforward: take compilers and/or computer architecture class, tinker with LLVM, pass coding/compilers interview. Perhaps because it wasn’t as popular?
This post is unavailable.
Amir Ayupov
@disruptnhandlr
Dec 3, 2023
That stuff has been on the verge of mainstream acceptance for at least past 20 years (Virtual Machines by Smith & Nair, 2005). Arguably it’s now closer than ever with Intel LBR for 0-overhead sampling, Linux eBPF for sample attribution/aggregation, and LLVM BOLT for optimization
Amir Ayupov
@disruptnhandlr
Oct 1, 2018
Replying to @disruptnhandlr
Как заставить ребёнка учить английский: предложить на выбор английский и татарский
Amir Ayupov
@disruptnhandlr
Jan 11, 2022
BOLT is merged into LLVM!
Merge BOLT into LLVM monorepo · llvm/llvm-project@4c106cf
From github.com
Amir Ayupov
@disruptnhandlr
Apr 9, 2024
I'm embarrassed to say it, but I didn't have a robust intuition about stack frames, unwinding and exception handling stuff (CIE, FDE, CFI, eh_frame and especially all things DWARF). This great note made it much clearer: lesenechal.fr/en/linux/unwin…
Amir Ayupov
@disruptnhandlr
Sep 2, 2022
I've been working on CMake magic to fully automatically apply BOLT to Clang, similar to how PGO two-stage build is automated with CMake cache file. It appears that fully automatically BOLT-optimized Clang is ~30% faster than the Release (-O3) Clang: reviews.llvm.org/D132975
Amir Ayupov
@disruptnhandlr
Nov 21, 2023
Compiler industry has all but converged to LLVM. The power of good design (IR-first + component/library organization), business-friendly license, and persistence plus charisma of Chris Lattner.
Alexander Yee
@Mysticial
Nov 21, 2023
RIP the classic #Intel C++ Compiler. You will be missed. It's been removed from #oneAPI 2024.
Amir Ayupov
@disruptnhandlr
May 10, 2023
Delayed birthday gift that coincidentally arrived the day I was supposed to present at EuroLLVM
Amir Ayupov
@disruptnhandlr
Jul 10, 2023
Why C++ JIT would make a lot of sense: ~80% of code is cold, i.e. never- or exceedingly rare- executed, and shouldn't be compiled in the first place. Effort is spent compiling it (with O3), then linking, then loading. From Propeller ASPLOS paper snehasish.net/assets/pdf/she…
Amir Ayupov
@disruptnhandlr
Nov 7, 2025
Replying to @_notapenguin
Compiler engineers work on different things but I'm closer to juicing perf out of CPUs. The best way to learn is by doing (something useful). Grep sources of your favorite project and find comments with TODO. BOLT has open ideas list:
discourse.llvm.org
BOLT Open Projects
Below is the list of BOLT project ideas with a brief description of each. Once a project is picked for active development, expect to start a new topic and file an RFC when suitable. Comment on this...
Amir Ayupov
@disruptnhandlr
May 1, 2020
На платформе stepik.org очень полезный курс с мягким введением в сложные алгоритмы. Для меня стала проясняться динамика, которую я никогда раньше как следует не понимал (после того, как неделю решал три последние задачи в разделе Восстановление ответа)
Amir Ayupov
@disruptnhandlr
Nov 13, 2025
Our Server LLVM team is hiring experienced compiler, performance, and VM engineers metacareers.com/jobs/339254149…
Amir Ayupov
@disruptnhandlr
Nov 7, 2025
If a compiler job requires grinding these days I probably wouldn’t get one. All that was necessary 5-10 years ago seemed straightforward: take compilers and/or computer architecture class, tinker with LLVM, pass coding/compilers interview. Perhaps because it wasn’t as popular?
Amir Ayupov
@disruptnhandlr
Jan 22, 2020
В 14 лет дизассемблировал прошивки от Моторолы C650/E398/V3, читал доки на Arm-процессор в телефоне. Почувствовал, что хочу «делать процессоры» и/или писать низкоуровневый код. Дальше физматкласс, ЕГЭ по информатике, физтех, кафедра МФТИ-Интел, стажировка, оффер
анатолий капустин
@A_Kapustin
Jan 22, 2020
Немного завидую людям, которые с самого детства знали кем они хотят быть когда станут взрослыми:( В свои 26 я до сих пор не понимаю кем я хочу быть и когда я стану взрослым А как вы поняли кем вы хотите быть? Когда вы поняли, что вы взрослый?
Amir Ayupov
@disruptnhandlr
Dec 2, 2024
Yes, “retire” the only competent CEO in a decade and install CFO as interim, signature Intel move. I can just wish BOD would pick home-grown technical talent for the next CEO, or lure TSM/AMD/NVDA chief execs into the job.