why disable Plane::Ops for all wgpu cpu backends?

[jyi2ya]

cubecl/crates/cubecl-wgpu/src/runtime.rs

Lines 363 to 372 in c544dc7

	#[cfg(not(all(target_os = "macos", feature = "msl")))]
	{
	if features.contains(wgpu::Features::SUBGROUP)
	&& setup.adapter.get_info().device_type != wgpu::DeviceType::Cpu
	{
	use cubecl_ir::features::Plane;
	device_props.features.plane.insert(Plane::Ops);
	}
	}

i tried plane ops on llvmpipe (llvm 22.1.8), and they worked well. is there any historical reasons?

[nathanielsimard]

Well the plane_size is one, so yeah we could support them as just perform the equivalent local instruction.