---
weight: 100
title: "MV_CFF"
description: "Force a CFF pass"
icon: "code_blocks"
date: "2025-05-01T18:47:58-05:00"
lastmod: "2025-05-01T18:47:58-05:00"
---

`declare function MV_CFF<A..., R...>(vmFunction: (A...) -> R..., enableExpressionDecomposition?: boolean): (A...) -> R...`

will force the [CFF](/docs/options/flatten-control-flow) pass onto the passed function. Expression decomposition is enabled by default, but can be disabled with the second argument.

## Valid Usage

```lua
MV_CFF(function()
    for i = 0, 10 do
        print('this is flattened!', i)
    end
    MV_OMIT_CFF(function() print('this isnt') end)()
end)()

-- passing false as a second argument will disable expression decomposition, leading to much smaller output
MV_CFF(function()
    for i = 0, 10 do
        print('this is flattened!', i)
    end
    MV_OMIT_CFF(function() print('this isnt') end)()
end, false)()
```