opt:tldr:1c183

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

$ opt -O2 ${filename-bc} -S -o ${path-to-output_file-bc}

try on your machine

This command is using the LLVM opt tool to perform various optimizations on a given input file.

Here is the breakdown of each part of the command:

opt: It is the command to run the LLVM optimizer.
-O2: It specifies the level of optimization to be performed. In this case, level 2 optimization is chosen, which is a moderate level of optimization.
${filename-bc}: This is a placeholder representing the input file, which is in LLVM bitcode format (with the .bc extension). You need to replace ${filename-bc} with the actual name of the input file.
-S: It instructs the opt tool to also generate human-readable LLVM assembly code as output.
-o ${path-to-output_file-bc}: This indicates the output file path and name. You need to replace ${path-to-output_file-bc} with the desired path and name for the output file (also in LLVM bitcode format).

To summarize, the command takes an LLVM bitcode file, optimizes it at level 2, generates human-readable assembly code, and saves it to a specified output file path.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

back to the opt tool