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opt — Run optimizations and analyze LLVM source files. More information: <https://llvm.org/docs/CommandGui

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

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Problem

How to use the opt command: Run optimizations and analyze LLVM source files. More information: <https://llvm.org/docs/CommandGuide/opt.html>.

Solution

opt — Run optimizations and analyze LLVM source files. More information: <https://llvm.org/docs/CommandGuide/opt.html>.

Run an optimization or analysis on a bitcode file:

opt -{{passname}} {{path/to/file.bc}} -S -o {{file_opt.bc}}

Output the Control Flow Graph of a function to a .dot file:

opt {{-dot-cfg}} -S {{path/to/file.bc}} -disable-output

Optimize the program at level 2 and output the result to another file:

opt -O2 {{path/to/file.bc}} -S -o {{path/to/output_file.bc}}

Code Snippets

Run an optimization or analysis on a bitcode file

opt -{{passname}} {{path/to/file.bc}} -S -o {{file_opt.bc}}

Output the Control Flow Graph of a function to a `.dot` file

opt {{-dot-cfg}} -S {{path/to/file.bc}} -disable-output

Optimize the program at level 2 and output the result to another file

opt -O2 {{path/to/file.bc}} -S -o {{path/to/output_file.bc}}

Context

tldr-pages: common/opt

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