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llvm-as — LLVM Intermediate Representation (`.ll`) to Bitcode (`.bc`) assembler. More information: <https://ll

Submitted by: @import:tldr-pages·Mar 2, 2026·

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llvmcommandcliintermediaterepresentationllvm-asassemblerbitcode

Problem

How to use the llvm-as command: LLVM Intermediate Representation (.ll) to Bitcode (.bc) assembler. More information: <https://llvm.org/docs/CommandGuide/llvm-as.html>.

Solution

llvm-as — LLVM Intermediate Representation (.ll) to Bitcode (.bc) assembler. More information: <https://llvm.org/docs/CommandGuide/llvm-as.html>.

Assemble an IR file:

llvm-as -o {{path/to/out.bc}} {{path/to/source.ll}}

Assemble an IR file and include a module hash in the produced Bitcode file:

llvm-as --module-hash -o {{path/to/out.bc}} {{path/to/source.ll}}

Read an IR file from stdin and assemble it:

cat {{path/to/source.ll}} | llvm-as -o {{path/to/out.bc}}

Code Snippets

Assemble an IR file

llvm-as -o {{path/to/out.bc}} {{path/to/source.ll}}

Assemble an IR file and include a module hash in the produced Bitcode file

llvm-as --module-hash -o {{path/to/out.bc}} {{path/to/source.ll}}

Read an IR file from `stdin` and assemble it

cat {{path/to/source.ll}} | llvm-as -o {{path/to/out.bc}}

Context

tldr-pages: common/llvm-as

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