LLVM-PROFGEN(1)

📦
version 20.1.8 · 8 versions
, in fedora 43, fedora 44

💖 LLVM-PROFGEN(1) 💖

okay bestie, welcome to the llvm-profgen page — it lives in the LLVM manual, section 1, and it's literally the SPGO profile generator. sit down, hydrate, let's go 🫶

✨ NAME ✨

llvm-profgen — the LLVM SPGO profile generation tool 🎀

🌸 SYNOPSIS 🌸

llvm-profgen [commands] [options]

🦋 DESCRIPTION 🦋

So the way that llvm-profgen works is: it takes perf script data files you hand it and generates a profile data file from them, for sample-based profile guided optimization — that's SPGO if you're being brief. it's giving compiler-nerd glow-up, no cap. 🔥

👑 COMMANDS 👑

not optional, bestie — you need at least one of these. it's giving "required", because it is. 💅

  • --perfscript=<string[,string,...]> — the path of the perf-script trace, the one the Linux perf tool made with the script command. heads up though: the raw perf.data had to have been profiled with -b. 🍓
  • --binary=<string[,string,...]> — the path(s) of the input profiled binary file(s).
  • --output=<string> — the path of the output profile file.

💅 OPTIONS 💅

llvm-profgen supports these, and yes we're listing every single one:

  • --format=[text|binary|extbinary|compbinary|gcc] — pick the format of the generated profile. the supported <format> values are text, binary, extbinary, compbinary and gcc — and if you want the full tea on what those formats actually mean, check llvm-profdata, it spills it. ✨
  • --show-mmap-events — prints mmap events. 👀
  • --show-disassembly — prints disassembled code.
  • --x86-asm-syntax=[att|intel] — choose whether the assembly code gets printed in AT&T syntax (which is the default, btw) or Intel syntax.

🌈 AUTHOR 🌈

maintained by the LLVM Team</u> — https://llvm.org/ 🫶

2003-2025, LLVM Project

and that's the whole page, bestie — mwah 💋 this was LLVM-PROFGEN(1) from the LLVM manual, page 20, dated 2025-09-03. periodt. 💖✨🎀🦋

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