[#llvm-isCriticalEdge-00]
= xref:llvm.adoc[llvm]::isCriticalEdge
:relfileprefix: ../
:mrdocs:

Return true if the specified edge is a critical edge.

== Synopsis

Declared in `<llvm/Analysis/CFG.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isCriticalEdge(
    xref:llvm/Instruction.adoc[Instruction] const* TI,
    unsigned int SuccNum,
    bool AllowIdenticalEdges = false);
----

== Description

Critical edges are edges from a block with multiple successors to a block with multiple predecessors.

== Return Value

True if the edge is critical.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *TI*
| Terminator instruction that defines the edge source.
| *SuccNum*
| Zero‐based successor index of the edge.
| *AllowIdenticalEdges*
| If true, identical edges are not critical.
|===


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