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Remove Allocations.

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It's not necessary, and just complicates things.
This commit is contained in:
Nicholas Nethercote 2024-08-29 11:30:12 +10:00
parent 0a282ea717
commit ad5a6e11c7
1 changed files with 4 additions and 14 deletions
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18
compiler/rustc_mir_transform/src/dest_prop.rs
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@ -164,7 +164,8 @@ impl<'tcx> MirPass<'tcx> for DestinationPropagation {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let def_id = body.source.def_id();
let mut allocations = Allocations::default();
let mut candidates = FxIndexMap::default();
let mut candidates_reverse = FxIndexMap::default();
let mut write_info = WriteInfo::default();
trace!(func = ?tcx.def_path_str(def_id));
@ -196,8 +197,8 @@ impl<'tcx> MirPass<'tcx> for DestinationPropagation {
let mut candidates = find_candidates(
body,
&borrowed,
&mut allocations.candidates,
&mut allocations.candidates_reverse,
&mut candidates,
&mut candidates_reverse,
);
trace!(?candidates);
dest_prop_mir_dump(tcx, body, &points, &live, round_count);
@ -255,17 +256,6 @@ impl<'tcx> MirPass<'tcx> for DestinationPropagation {
}
}
/// Container for the various allocations that we need.
///
/// We store these here and hand out `&mut` access to them, instead of dropping and recreating them
/// frequently. Everything with a `&'alloc` lifetime points into here.
#[derive(Default)]
struct Allocations {
candidates: FxIndexMap<Local, Vec<Local>>,
candidates_reverse: FxIndexMap<Local, Vec<Local>>,
// PERF: Do this for `MaybeLiveLocals` allocations too.
}
#[derive(Debug)]
struct Candidates<'alloc> {
/// The set of candidates we are considering in this optimization.