Move the upper 2 single-precision (32-bit) floating-point elements from b to the lower 2 elements of result, and copy the upper 2 elements from a to the upper 2 elements of dst.
See Implementation
Move the upper 2 single-precision (32-bit) floating-point elements from b to the lower 2 elements of result, and copy the upper 2 elements from a to the upper 2 elements of dst.