Module 

Header 
/Engine/Source/Runtime/Core/Public/Math/UnrealMathNeon.h 
Include 
#include "Math/UnrealMathNeon.h" 
VectorRegister VectorShuffle
(
VectorRegister V1,
VectorRegister V2,
uint32 PermuteX,
uint32 PermuteY,
uint32 PermuteZ,
uint32 PermuteW
)
Creates a vector through selecting two components from each vector via a shuffle mask.
The swizzled vector
Parameter 
Description 

Vec1 
Source vector1 
Vec2 
Source vector2 
X 
Index for which component of Vector1 to use for X (literal 03) 
Y 
Index for which component of Vector1 to use for Y (literal 03) 
Z 
Index for which component of Vector2 to use for Z (literal 03) 
W 
Index for which component of Vector2 to use for W (literal 03) 