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I have a register hierarchy that looks like a binary tree. v4 -> {v2, v2} -> {s, s}{s, s}(or, {x, y}, {z, w}) I have an instruction that can access the 2nd and/or 4th scalar and an instruction that can access the 1st and/or 3rd scalar. What I need to do is that given the first scalar, I need to be able to select the 2nd scalar, or/and given the 3rd, select the 4th. I define a sibling