[__arm_]vcmulq_rot270[_f16]

This instruction operates on complex numbers that are represented in registers as pairs of elements. Each element holds a floating-point value. The odd element holds the imaginary part of the number, and the even element holds the real part of the number. The instruction performs the computation on the corresponding complex number element pairs from the two source registers and the destination register. Considering the complex number from the second source register on an Argand diagram, the number is rotated counterclockwise by 0, 90, 180, or 270 degrees. If the transformation was a rotation by 0 or 180 degrees, the two elements of the transformed complex number are multiplied by the real element of the first source register. If the transformation was a rotation by 90 or 270 degrees, the two elements are multiplied by the imaginary element of the complex number from the first source register. The results are written into the destination vector register.