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There are less than 2^16 lanes within a threadgroup, so it is safe to do all math at 16-bit. This allows us to use 16-bit integer division which is much faster than 32-bit integer division (in terms of the lowerings). In a "hello world" kernel with variable wg size, simd32 goes 72 inst -> 57 inst on jay and 82 -> 67 inst on brw. OTOH it's a loss for non-variable wg size, so do it only there to avoid unwelcome stats regresions on Vulkan. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41084> |
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