[#llvm-SplitBlockAndInsertIfThenElse-0c7]
= xref:llvm.adoc[llvm]::SplitBlockAndInsertIfThenElse
:relfileprefix: ../
:mrdocs:

Split a block and insert then/else branches at an instruction.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SplitBlockAndInsertIfThenElse(
    xref:llvm/Value.adoc[Value]* Cond,
    xref:llvm/Instruction.adoc[Instruction]* SplitBefore,
    xref:llvm/Instruction.adoc[Instruction]** ThenTerm,
    xref:llvm/Instruction.adoc[Instruction]** ElseTerm,
    xref:llvm/MDNode.adoc[MDNode]* BranchWeights = nullptr,
    xref:llvm/DomTreeUpdater.adoc[DomTreeUpdater]* DTU = nullptr,
    xref:llvm/LoopInfo.adoc[LoopInfo]* LI = nullptr);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *Cond*
| Condition controlling the inserted branch.
| *SplitBefore*
| Instruction at which the block is split.
| *ThenTerm*
| Set to the terminator of the then‐block.
| *ElseTerm*
| Set to the terminator of the else‐block.
| *BranchWeights*
| Optional branch‐weight metadata for the new branch.
| *DTU*
| Optional dominator‐tree updater for CFG changes.
| *LI*
| Optional loop info to update.
|===


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