[Bug 108875] Invalid subgroupSize for Intel GPU

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Nov 27 14:33:48 UTC 2018


--- Comment #7 from Alexander <frustumo at gmail.com> ---
Yep, you are right. The subgroupSize is 32 only for shaders with local group
size more than 896. Otherwise, the subgroupSize equals to 16. Unfortunately,
there is no way to determine the actual size (or minimum size) of subgroupSize
variable in the Vulkan API. It will be possible to optimize shaders better with
guaranteed minimal subgroupSize value. Under Direct3D12 the subgroupSize is
always 8 on Intel hardware. Maybe it will be a way to declare the subgroupSize
value during shader compilation?

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