The floating-point vector classes, F64vec2, F32vec4, and F32vec1, provide an interface to SIMD operations. The class specifications are as follows:
F64vec2 A(double x, double y);
F32vec4 A(float z, float y, float x, float w);
F32vec1 B(float w);
The packed floating-point input values are represented with the right-most value lowest as shown in the following table.