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The SPIR-V backend may emit SPIR-V 1.3 if Vulkan 1.1 is available. Some extensions which provide wave op instructions are available in SPIR-V 1.0, but these are not sufficient to implement all Shader Model 6 wave op intrinsics. SPIR-V 1.3 has all of the required instructions, but does not support reading from a quad at a non-constant (but uniform) lane index, so it may later prove necessary to introduce a Vulkan 1.2 environment.