Explain? My experience has been that you don't need much. I've benchmarked Agner's exp, and if you have 4 calculations to do, then calling it with avx2 will be

Explain? My experience has been that you don't need much. I've benchmarked Agner's exp, and if you have 4 calculations to do, then calling it with avx2 will be 4x faster than calling std::exp four times.