opt

A tool that takes LLVM source files and runs specified optimizations and/or analyses on them.

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• 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}

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