Re: [eigen] Eigen containers cannot be vectorized

[fayard@xxxxxxxxxxxxx]

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.