opt

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