how to use 2 SIMD in EU

[Fu_J_Intel]

Gen8/9 has 2 SIMD in each EU.  How can i specify to use 2 SIMD in openCL?

thanks,

Jeffrey

[Tamer_Assad]

Hi Jeffrey,

First, your kernel's NDRange should be  wide enough to utilize multiple SIMD.

Then, in order to motivate the compiler to use 2 SIMD lanes, make sure you have:

 1- simultaneous Kernel instances executing the same target instruction

 2- target instruction applied to elements of a data type fitting half the target SIMD. (data type length <= Target SIMD Width/2)

 3- explicit declaration of target data type.

Best regards,

Tamer