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Only check storage liveness for direct projections.

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This commit is contained in:
Camille GILLOT 2023-05-07 12:09:06 +00:00
parent 3b4e1fe104
commit a67bf08ed7
1 changed files with 3 additions and 6 deletions
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9
compiler/rustc_mir_transform/src/ref_prop.rs
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@ -163,18 +163,15 @@ fn compute_replacement<'tcx>(
};
let mut can_perform_opt = |target: Place<'tcx>, loc: Location| {
maybe_dead.seek_after_primary_effect(loc);
let maybe_dead = maybe_dead.contains(target.local);
if target.projection.first() == Some(&PlaceElem::Deref) {
// We are creating a reborrow. As `place.local` is a reference, removing the storage
// statements should not make it much harder for LLVM to optimize.
if maybe_dead {
storage_to_remove.insert(target.local);
}
storage_to_remove.insert(target.local);
true
} else {
// This is a proper dereference. We can only allow it if `target` is live.
maybe_dead.seek_after_primary_effect(loc);
let maybe_dead = maybe_dead.contains(target.local);
!maybe_dead
}
};