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Auto merge of #68606 - jonas-schievink:normalize-fastpath, r=Zoxc

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Add an early-exit to `QueryNormalizer::fold_ty`

Pulled out from https://github.com/rust-lang/rust/pull/68524, this results in a ~60-70% reduction in compile time for the await-call-tree benchmarks. This should unblock https://github.com/rust-lang/rust/issues/67982 as well.

r? @Zoxc
This commit is contained in:
bors 2020-01-28 20:26:24 +00:00
commit 3761dcd346
1 changed files with 4 additions and 0 deletions
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4
src/librustc/traits/query/normalize.rs
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@ -81,6 +81,10 @@ impl<'cx, 'tcx> TypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
}
fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
if !ty.has_projections() {
return ty;
}
let ty = ty.super_fold_with(self);
match ty.kind {
ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {