bjoernager/rust
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Cache feature unsized locals + use smallvec.

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This commit is contained in:
Camille GILLOT 2023-05-16 10:19:08 +00:00
parent 05c4eef95e
commit e26c9a42c6
1 changed files with 7 additions and 3 deletions
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10
compiler/rustc_mir_transform/src/gvn.rs
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@ -99,6 +99,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt, TypeAndMut};
use rustc_span::def_id::DefId;
use rustc_span::DUMMY_SP;
use rustc_target::abi::{self, Abi, Size, VariantIdx, FIRST_VARIANT};
use smallvec::SmallVec;
use std::borrow::Cow;
use crate::dataflow_const_prop::DummyMachine;
@ -241,13 +242,15 @@ struct VnState<'body, 'tcx> {
/// Locals that are assigned that value.
// This vector does not hold all the values of `VnIndex` that we create.
// It stops at the largest value created in the first phase of collecting assignments.
rev_locals: IndexVec<VnIndex, Vec<Local>>,
rev_locals: IndexVec<VnIndex, SmallVec<[Local; 1]>>,
values: FxIndexSet<Value<'tcx>>,
/// Values evaluated as constants if possible.
evaluated: IndexVec<VnIndex, Option<OpTy<'tcx>>>,
/// Counter to generate different values.
/// This is an option to stop creating opaques during replacement.
next_opaque: Option<usize>,
/// Cache the value of the `unsized_locals` features, to avoid fetching it repeatedly in a loop.
feature_unsized_locals: bool,
ssa: &'body SsaLocals,
dominators: &'body Dominators<BasicBlock>,
reused_locals: BitSet<Local>,
@ -271,6 +274,7 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
values: FxIndexSet::default(),
evaluated: IndexVec::new(),
next_opaque: Some(0),
feature_unsized_locals: tcx.features().unsized_locals,
ssa,
dominators,
reused_locals: BitSet::new_empty(local_decls.len()),
@ -318,10 +322,10 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
self.locals[local] = Some(value);
// Only register the value if its type is `Sized`, as we will emit copies of it.
let is_sized = !self.tcx.features().unsized_locals
let is_sized = !self.feature_unsized_locals
|| self.local_decls[local].ty.is_sized(self.tcx, self.param_env);
if is_sized {
self.rev_locals.ensure_contains_elem(value, Vec::new);
self.rev_locals.ensure_contains_elem(value, SmallVec::new);
self.rev_locals[value].push(local);
}
}