The Ivec classes provide an interface to SIMD processing using integer vectors of various sizes. The class hierarchy is represented in the following figure.
The M64 and M128 classes define the __m64 and __m128i data types from which the rest of the Ivec classes are derived. The first generation of child classes are derived based solely on bit sizes of 128, 64, 32, 16, and 8 respectively for the I128vec1, I64vec1, 164vec2, I32vec2, I32vec4, I16vec4, I16vec8, I8vec16, and I8vec8 classes. The latter seven of the these classes require specification of signedness and saturation.
Do not intermix the M64 and M128 data types. You will get unexpected behavior if you do.
The signedness is indicated by the s and u in the class names: