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llvm-as - Man Page

LLVM assembler

Examples (TL;DR)


llvm-as [options] [filename]


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:



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.


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

llvm-dis(1), as(1)


Maintained by the LLVM Team (https://llvm.org/).

Referenced By

llvm-dis(1), llvm-dis-11(1), llvm-dis-12(1), llvm-dis-13(1), llvm-dis-14(1), llvm-dis-15(1), llvm-dis-16(1), llvm-dis-17(1).

2024-04-12 18 LLVM