bjoernager/rust
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remove unnecessary sized checks

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This commit is contained in:
Lukas Markeffsky 2024-03-13 23:35:24 +01:00
parent 8ad94111ad
commit 8fe99f57a4
4 changed files with 15 additions and 11 deletions
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8
compiler/rustc_const_eval/src/interpret/eval_context.rs
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@ -1034,8 +1034,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
) -> InterpResult<'tcx> {
trace!("{:?} is now live", local);
// We avoid `ty.is_trivially_sized` since that (a) cannot assume WF, so it recurses through
// all fields of a tuple, and (b) does something expensive for ADTs.
// We avoid `ty.is_trivially_sized` since that does something expensive for ADTs.
fn is_very_trivially_sized(ty: Ty<'_>) -> bool {
match ty.kind() {
ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
@ -1054,9 +1053,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
| ty::Closure(..)
| ty::CoroutineClosure(..)
| ty::Never
| ty::Error(_) => true,
| ty::Error(_)
| ty::Dynamic(_, _, ty::DynStar) => true,
ty::Str | ty::Slice(_) | ty::Dynamic(..) | ty::Foreign(..) => false,
ty::Str | ty::Slice(_) | ty::Dynamic(_, _, ty::Dyn) | ty::Foreign(..) => false,
ty::Tuple(tys) => tys.last().iter().all(|ty| is_very_trivially_sized(**ty)),