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They use same instruction. Just because when the time nir_load_smem_buffer_amd was introduced, radeonsi didn't support pass buffer descriptor to nir_load_ubo directly. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Signed-off-by: Qiang Yu <yuq825@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22523>