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Regalloc will be able to handle these spurious phis, however, some other spurious dead instructions can be emitted. It would be better to get rid of them upfront; maybe by modifying isel, or by inserting a proper dce pass. An example of that undesirable behavior is exposed below. @l1 %foo =w ... @l2 %dead =w phi @l1 %foo, ... |
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