In such case we can have ``` GPU_target = [ id: "cuda" ] // non-composite, no target_host System_target = [ id: "cuda", id: "cpu" ] // composite optimize(E1, GPU_target) // func, target set<pair<func, target_id>> S = legalize(E1, System_target) for s in S: low_level_optimize(s.first, s.second) // func, target ``` In cases where the (larger) system target is not needed, we could use the same target for optimization and legalization. As a result, all pairs in the set S would have the same second element.
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