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

Split an edge that is already known to be critical.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/BasicBlock.adoc[BasicBlock]*
SplitKnownCriticalEdge(
    xref:llvm/Instruction.adoc[Instruction]* TI,
    unsigned int SuccNum,
    xref:llvm/CriticalEdgeSplittingOptions.adoc[CriticalEdgeSplittingOptions] const& Options = CriticalEdgeSplittingOptions(),
    xref:llvm/Twine.adoc[Twine] const& BBName = "");
----

== Description

If it is known that an edge is critical, SplitKnownCriticalEdge can be called directly, rather than calling SplitCriticalEdge first.

== Return Value

The newly created block that splits the critical edge.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *TI*
| Terminator whose outgoing critical edge is split.
| *SuccNum*
| Index of the successor edge to split.
| *Options*
| Analyses and policy controlling the split.
| *BBName*
| Optional name for the newly created block.
|===


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