[#llvm-checkForCycles-06]
= xref:llvm.adoc[llvm]::checkForCycles
:relfileprefix: ../
:mrdocs:

Check the subgraph rooted at `N` for cycles.

== Synopsis

Declared in `<llvm/CodeGen/SelectionDAGNodes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
checkForCycles(
    xref:llvm/SDNode.adoc[SDNode] const* N,
    xref:llvm/SelectionDAG.adoc[SelectionDAG] const* DAG = nullptr,
    bool force = false);
----

== Description

When `DAG` is non‐null, cycle diagnostics may include DAG context. When `force` is true, the check runs even in builds that normally skip it.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *N*
| Root node of the subgraph to check.
| *DAG*
| Optional SelectionDAG used for diagnostics.
| *force*
| Force the cycle check when true.
|===


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