bjoernager/rust
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Auto merge of #93984 - nnethercote:ChunkedBitSet, r=Mark-Simulacrum

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Introduce `ChunkedBitSet` and use it for some dataflow analyses.

This reduces peak memory usage significantly for some programs with very
large functions.

r? `@ghost`
This commit is contained in:
bors 2022-02-23 01:26:07 +00:00
commit bafe8d06e0
14 changed files with 806 additions and 75 deletions
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4
compiler/rustc_mir_transform/src/remove_uninit_drops.rs
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@ -1,4 +1,4 @@
use rustc_index::bit_set::BitSet;
use rustc_index::bit_set::ChunkedBitSet;
use rustc_middle::mir::{Body, Field, Rvalue, Statement, StatementKind, TerminatorKind};
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt, VariantDef};
@ -89,7 +89,7 @@ impl<'tcx> MirPass<'tcx> for RemoveUninitDrops {
fn is_needs_drop_and_init<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
maybe_inits: &BitSet<MovePathIndex>,
maybe_inits: &ChunkedBitSet<MovePathIndex>,
move_data: &MoveData<'tcx>,
ty: Ty<'tcx>,
mpi: MovePathIndex,