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

Attempt to constant fold a shufflevector instruction with the specified operands and mask.

== Synopsis

Declared in `<llvm/IR/ConstantFold.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/Constant.adoc[Constant]*
ConstantFoldShuffleVectorInstruction(
    xref:llvm/Constant.adoc[Constant]* V1,
    xref:llvm/Constant.adoc[Constant]* V2,
    xref:llvm/ArrayRef-08.adoc[ArrayRef<int>] Mask);
----

== Description

See class ShuffleVectorInst for a description of the mask representation. The constant result is returned if successful; if not, null is returned.

== Return Value

The folded constant, or null if the shuffle cannot be folded.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *V1*
| The first vector operand.
| *V2*
| The second vector operand.
| *Mask*
| The shuffle mask.
|===


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