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

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This commit is contained in:
Bram van den Heuvel
2020-09-19 12:06:17 +02:00
parent 70148d7b31
commit ab83d372ed
3 changed files with 6 additions and 3 deletions
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5
compiler/rustc_middle/src/ty/mod.rs
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@@ -1745,6 +1745,9 @@ 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 {
@@ -1825,7 +1828,7 @@ 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) }
ty::ParamEnv { packed: CopyTaggedPtr::new(caller_bounds, reveal), unused_field: None }
}
pub fn with_user_facing(mut self) -> Self {