Re: [eigen] Eigen containers cannot be vectorized

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On 2016-12-08 21:46, Marc Glisse wrote:
On Thu, 8 Dec 2016, Francois Fayard wrote:

the following code does not vectorize:

It does with both gcc and clang (depending on the options you pass).
Time to try a better compiler?

Thanks. I have just tried with clang 3.9 and indeed, it does vectorize the loop. Intel compilers are lost on this one.

But the problem is still there when dealing with matrices made of Eigen::Index (std::ptrdiff_t, or long int on 64-bit Linux) elements. And this time, there is no way a compiler can vectorize it because of aliasing.

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