bjoernager/rust
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Auto merge of #100032 - BoxyUwU:no_ty_in_placeholder_const, r=compiler-errors

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make `PlaceholderConst` not store the type of the const

Currently the `Placeholder` variant on `ConstKind` is 28 bytes when with this PR its 8 bytes, i am not sure this is really useful at all rn since `Unevaluated` and `Value` variants are huge still but eventually it should be possible to get both down to 16 bytes 🤔. Mostly opening this to see if this change has any perf impact when done before it can make `ConstKind`/`ConstS` smaller
This commit is contained in:
bors 2022-08-02 13:10:49 +00:00
commit 06f4950cbd
8 changed files with 21 additions and 19 deletions
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5
compiler/rustc_trait_selection/src/traits/project.rs
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@ -744,10 +744,7 @@ impl<'tcx> TypeFolder<'tcx> for BoundVarReplacer<'_, 'tcx> {
}
ty::ConstKind::Bound(debruijn, bound_const) if debruijn >= self.current_index => {
let universe = self.universe_for(debruijn);
let p = ty::PlaceholderConst {
universe,
name: ty::BoundConst { var: bound_const, ty: ct.ty() },
};
let p = ty::PlaceholderConst { universe, name: bound_const };
self.mapped_consts.insert(p, bound_const);
self.infcx
.tcx