'Multiplication of complex numbers using AVX2+FMA3
I have found some solutions where each AVX2 register holds both, the real and imaginary part of the complex numbers. I am interested in a solution where each AVX2 registers holds either the real or the imaginary part.
Assuming we have 4 AVX2 registers:R1, I1, R2, I2
Registers R1, I1 form 4 complex numbers. Same applies for the remaining two registers. Now I want to multiply the 4 complex numbers of R1, I1 with the 4 complex numbers of R2, I2. What would be the most efficient way to do this? Besides AVX2, FMA3 can be used as well.
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