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Revert "Add an unused field of type Option<DefId> to ParamEnv struct."

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This reverts commit ab83d372ed.
This commit is contained in:
Dylan MacKenzie 2020-09-22 18:30:53 -07:00
parent bb6c249f99
commit c4d8089f00
3 changed files with 3 additions and 6 deletions
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2
compiler/rustc_infer/src/traits/mod.rs
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@ -57,7 +57,7 @@ pub type TraitObligation<'tcx> = Obligation<'tcx, ty::PolyTraitPredicate<'tcx>>;
// `PredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
#[cfg(target_arch = "x86_64")]
static_assert_size!(PredicateObligation<'_>, 40);
static_assert_size!(PredicateObligation<'_>, 32);
pub type Obligations<'tcx, O> = Vec<Obligation<'tcx, O>>;
pub type PredicateObligations<'tcx> = Vec<PredicateObligation<'tcx>>;

5
compiler/rustc_middle/src/ty/mod.rs
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@ -1751,9 +1751,6 @@ pub struct ParamEnv<'tcx> {
///
/// Note: This is packed, use the reveal() method to access it.
packed: CopyTaggedPtr<&'tcx List<Predicate<'tcx>>, traits::Reveal, true>,
/// FIXME: This field is not used, but removing it causes a performance degradation. See #76913.
unused_field: Option<DefId>,
}
unsafe impl rustc_data_structures::tagged_ptr::Tag for traits::Reveal {
@ -1834,7 +1831,7 @@ impl<'tcx> ParamEnv<'tcx> {
/// Construct a trait environment with the given set of predicates.
#[inline]
pub fn new(caller_bounds: &'tcx List<Predicate<'tcx>>, reveal: Reveal) -> Self {
ty::ParamEnv { packed: CopyTaggedPtr::new(caller_bounds, reveal), unused_field: None }
ty::ParamEnv { packed: CopyTaggedPtr::new(caller_bounds, reveal) }
}
pub fn with_user_facing(mut self) -> Self {

2
compiler/rustc_trait_selection/src/traits/fulfill.rs
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@ -87,7 +87,7 @@ pub struct PendingPredicateObligation<'tcx> {
// `PendingPredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
#[cfg(target_arch = "x86_64")]
static_assert_size!(PendingPredicateObligation<'_>, 64);
static_assert_size!(PendingPredicateObligation<'_>, 56);
impl<'a, 'tcx> FulfillmentContext<'tcx> {
/// Creates a new fulfillment context.