LLVM-AS(1)

✨ LLVM-AS ✨

ok so bestie, welcome to the llvm-as page — the one and only LLVM assembler, straight out of the LLVM manual. pull up a chair, we're gonna get you fluent fr fr 💖

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🌸 SYNOPSIS 🌸

llvm-as [options] [filename]

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🦋 DESCRIPTION 🦋

llvm-as is the LLVM assembler — main character energy only 👑. What it does is: it reads a file stuffed with human-readable LLVM assembly language</>, translates all that into LLVM bitcode</>, and then writes the result out into a file or straight to standard output. iconic behaviour, no notes 💅

So okay, about filename — if you omit it entirely, or if you literally just pass -, then llvm-as reads its input from standard input</>. easy ✨

And if you don't specify an output file with the -o option, llvm-as will figure out where to send its output by following these rules (they're giving very organized, very demure):

• If the input is standard input, then the output is standard output</> 🫶
• If the input is a file that ends with .ll, then the output file is of the same name, except that the suffix is changed to .bc 🎀
• If the input is a file that does not end with the .ll suffix, then the output file has the same name as the input file, except that the .bc suffix is appended 🌸

like, it just knows. iykyk 💜

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💅 OPTIONS 💅

• -f — enables binary output on terminals 🔥. normally llvm-as will straight up refuse to write raw bitcode output if the output stream is a terminal (it's protective like that 🙈). with this option, llvm-as will write raw bitcode regardless of the output device. bold. love that for it.
• -help — prints a summary of the command line options ✨ your little cheat sheet.
• -o filename — specify the output file name 💖. and if filename is -, then llvm-as sends its output to standard output. classic.

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⭐ EXIT STATUS ⭐

If llvm-as succeeds, it will exit with 0 🎉 slay.

Otherwise, if an error occurs, it will exit with a non-zero value 😭 so like, watch for that.

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🧚 SEE ALSO 🧚

• llvm-dis(1) <llvm-dis.html>
• as(1)

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🌈 Author 🌈

Maintained by the LLVM Team (https://llvm.org/) 🫶 go give them a follow, honestly.

🍓 Copyright 🍓

2003-2026, LLVM Project

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and that's the whole vibe check, bestie 💀✨ this page is from the LLVM manual, source/version 21, dated 2026-05-15 — go forth and assemble, you've got this fr fr 💜🎀