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This is actually a no-op on AMD, so we really don't want to lower it to something more complicated. There may be a more efficient way to do this on Intel too. In addition, in the future we'll want to use this for lowering boolean reduce operations, where the inverse ballot will operate on the backend's "natural" ballot type as indicated by options->ballot_bit_size, instead of uvec4 as produced by SPIR-V. In total, there are now three possible lowerings we may have to perform: - inverse_ballot with source type of uvec4 from SPIR-V to inverse_ballot with natural source type, when the backend supports inverse_ballot natively. - inverse_ballot with source type of uvec4 from SPIR-V to arithmetic, when the backend doesn't support inverse_ballot. - inverse_ballot with natural source type from reduce operation, when the backend doesn't support inverse_ballot. Previously we just did the second lowering unconditionally in vtn, but it's just a combination of the first and third. We add support here for the first and third lowerings in nir_lower_subgroups, instead of simply moving the second lowering, to avoid unnecessary churn. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25123> |
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