[Mesa-dev] [PATCH 22/53] intel/fs: Disable SIMD32 dispatch on Gen4-6 with control flow

[Matt Turner]

On Thu, May 24, 2018 at 2:56 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> From: Francisco Jerez <currojerez at riseup.net>
>
> The hardware's control flow logic is 16-wide so we're out of luck
> here.  We could, in theory, support SIMD32 if we know the control-flow
> is uniform but we don't have that information at this point.

This is what the "fork" instruction is for on Gen6 :)