llvm/docs/CommandGuide/llvm-as.md

# llvm-as - LLVM assembler

```{program} llvm-as
```

## SYNOPSIS

**llvm-as** \[*options*\] \[*filename*\]

## DESCRIPTION

**llvm-as** is the LLVM assembler. It reads a file containing human-readable
LLVM assembly language, translates it to LLVM bitcode, and writes the result
into a file or to standard output.

If *filename* is omitted or is `-`, then **llvm-as** reads its input from
standard input.

If an output file is not specified with the **-o** option, then
**llvm-as** sends its output to a file or standard output by following
these rules:

- 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.

## OPTIONS

**-f**

: Enable binary output on terminals. Normally, **llvm-as** will refuse to
  write raw bitcode output if the output stream is a terminal. With this option,
  **llvm-as** will write raw bitcode regardless of the output device.

**-help**

: Print a summary of command line options.

**-o** *filename*

: Specify the output file name. If *filename* is `-`, then **llvm-as**
  sends its output to standard output.

## EXIT STATUS

If **llvm-as** succeeds, it will exit with 0. Otherwise, if an error occurs, it
will exit with a non-zero value.

## SEE ALSO

{manpage}`llvm-dis(1)`, as(1)