Re: [eigen] Array of complex numbers

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I would never try to get gcc or clang vectorize efficiently a loop. I tend to only use Intel compilers when I want to get efficient vectorization without writing intrinsics.

> On 10 Jan 2019, at 23:33, Gael Guennebaud <gael.guennebaud@xxxxxxxxx> wrote:
> hm... actually that's not that bad as clang is able to move two of the three permutations out of the loop, we only have to pay for a single extra permutation per product. With gcc, the overhead is quite significant.
> gael

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