opt

Runs optimizations and analyse LLVM source files. More information: https://llvm.org/docs/CommandGuide/opt.html.

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

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

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