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

Return true if the specified register is defined by G_BUILD_VECTOR or G_BUILD_VECTOR_TRUNC where all of the elements are `SplatValue` or undef.

== Synopsis

Declared in `<llvm/CodeGen/GlobalISel/Utils.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isBuildVectorConstantSplat(
    xref:llvm/Register.adoc[Register] const Reg,
    xref:llvm/MachineRegisterInfo.adoc[MachineRegisterInfo] const& MRI,
    int64_t SplatValue,
    bool AllowUndef);
----

== Return Value

True if all elements are `SplatValue` or undef.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *Reg*
| Virtual register defined by a build vector.
| *MRI*
| Register information for the function.
| *SplatValue*
| Expected splat integer value.
| *AllowUndef*
| Whether undef elements are permitted.
|===


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