Intel OpenCL auto-vectorization switch

[vince_f_]

Hi, I want to disable the auto-vectorization of OpenCL kernel on Xeon Phi, is there any way to do that?

[Yuri_K_Intel]

Hi,

You may specify __attribute__((vec_type_hint(<typen>))) where typen is some vector type (float3 or char4). Per documentation:

This attribute indicates to the vectorization module apply only transformations that are useful for this type.

So if you specify some type that your kernel is not using it will effectively disable vecorization.

Thanks,

Yuri

[vince_f_]

I gotcha, Thanks!