bjoernager/rust
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Do not grow assignment_order needlessly.

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This commit is contained in:
Camille GILLOT 2023-02-17 18:10:54 +00:00
parent 2a32a2b64f
commit 209eb8ae83
6 changed files with 92 additions and 22 deletions
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7
compiler/rustc_mir_transform/src/ssa.rs
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@ -53,7 +53,7 @@ impl SsaLocals {
body: &Body<'tcx>,
borrowed_locals: &BitSet<Local>,
) -> SsaLocals {
let assignment_order = Vec::new();
let assignment_order = Vec::with_capacity(body.local_decls.len());
let assignments = IndexVec::from_elem(Set1::Empty, &body.local_decls);
let dominators =
@ -203,7 +203,10 @@ impl<'tcx> Visitor<'tcx> for SsaVisitor {
match ctxt {
PlaceContext::MutatingUse(MutatingUseContext::Store) => {
self.assignments[local].insert(LocationExtended::Plain(loc));
self.assignment_order.push(local);
if let Set1::One(_) = self.assignments[local] {
// Only record if SSA-like, to avoid growing the vector needlessly.
self.assignment_order.push(local);
}
}
// Anything can happen with raw pointers, so remove them.
PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)