# llvm-cgdata - LLVM CodeGen Data Tool

```{program} llvm-cgdata
```

## SYNOPSIS

{program}`llvm-cgdata` \[**commands**\] \[**options**\] (\<binaries>|\<.cgdata>)

## DESCRIPTION

The :program:llvm-cgdata utility parses raw codegen data embedded in compiled
binary files and merges them into a single .cgdata file. It can also inspect
and manipulate .cgdata files. Currently, the tool supports saving and restoring
outlined hash trees and stable function maps, allowing for more efficient
function outlining and function merging across modules in subsequent
compilations. The design is extensible, allowing for the incorporation of
additional codegen summaries and optimization techniques.

## COMMANDS

At least one of the following commands are required:

:::{option} --convert
Convert a .cgdata file from one format to another.
:::

:::{option} --merge
Merge multiple raw codgen data in binaries into a single .cgdata file.
:::

:::{option} --show
Show summary information about a .cgdata file.
:::

## OPTIONS

{program}`llvm-cgdata` supports the following options:

:::{option} --format=[text|binary]
Specify the format of the output .cgdata file.
:::

:::{option} --output=<string>
Specify the output file name.
:::

:::{option} --cgdata-version
Print the version of the llvm-cgdata tool.
:::

## EXAMPLES

To convert a .cgdata file from binary to text format:

: \$ llvm-cgdata --convert --format=text input.cgdata --output=output.data

To merge multiple raw codegen data in object files into a single .cgdata file:

: \$ llvm-cgdata --merge file1.o file2.o --output=merged.cgdata

To show summary information about a .cgdata file:

: \$ llvm-cgdata --show input.cgdata