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mir-opt: Eliminate trivial unnecessary storage annotations

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dianqk 2025-07-15 22:54:54 +08:00
parent cc93132ae4
commit 85b2f70693
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50 changed files with 179 additions and 556 deletions
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4
compiler/rustc_mir_dataflow/src/impls/liveness.rs
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@ -233,8 +233,10 @@ impl<'a> MaybeTransitiveLiveLocals<'a> {
// Compute the place that we are storing to, if any
let destination = match stmt_kind {
StatementKind::Assign(box (place, rvalue)) => (rvalue.is_safe_to_remove()
// FIXME: We are not sure how we should represent this debugging information for some statements,
// keep it for now.
&& (!debuginfo_locals.contains(place.local)
|| (place.as_local().is_some() && matches!(rvalue, mir::Rvalue::Ref(..)))))
|| (place.as_local().is_some() && stmt_kind.as_debuginfo().is_some())))
.then_some(*place),
StatementKind::SetDiscriminant { place, .. } | StatementKind::Deinit(place) => {
(!debuginfo_locals.contains(place.local)).then_some(**place)