[#llvm-FlattenCFG]
= xref:llvm.adoc[llvm]::FlattenCFG
:relfileprefix: ../
:mrdocs:

Flatten a CFG by collapsing related if‐conditions and regions.

== Synopsis

Declared in `<llvm/Transforms/Utils/Local.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
FlattenCFG(
    xref:llvm/BasicBlock.adoc[BasicBlock]* BB,
    xref:llvm/AAResults.adoc[AAResults]* AA = nullptr);
----

== Description

This function is used to flatten a CFG. For example, it uses parallel‐and and parallel‐or mode to collapse if‐conditions and merge if‐regions with identical statements.

== Return Value

True if the CFG was flattened.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *BB*
| Basic block whose surrounding CFG may be flattened.
| *AA*
| Optional alias analysis used during flattening.
|===


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