--- Comment #3 from Richard Biener <rguenth at gcc dot> ---
I think the only way we can improve this is tracking liveness with CLOBBERs
(but that relies on CLOBBERs being present).  Like walking dominators looking
CLOBBERs (or computing full data-flow for the desired set of vars, see
cfgexpand.c:add_scope_conflicts how this works with CLOBBERs).

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