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Rollup merge of #109179 - llogiq:intrinsically-option-as-slice, r=eholk

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move Option::as_slice to intrinsic

````@scottmcm```` suggested on #109095 I use a direct approach of unpacking the operation in MIR lowering, so here's the implementation.

cc ````@nikic```` as this should hopefully unblock #107224 (though perhaps other changes to the prior implementation, which I left for bootstrapping, are needed).
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Dylan DPC 2023-03-23 00:00:31 +05:30 • committed by GitHub
commit 14d06467f0
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8 changed files with 152 additions and 72 deletions
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15
compiler/rustc_hir_analysis/src/check/intrinsic.rs
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@ -223,6 +223,21 @@ pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
],
tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
),
sym::option_payload_ptr => {
let option_def_id = tcx.require_lang_item(hir::LangItem::Option, None);
let p0 = param(0);
(
1,
vec![tcx.mk_ptr(ty::TypeAndMut {
ty: tcx.mk_adt(
tcx.adt_def(option_def_id),
tcx.mk_substs_from_iter([ty::GenericArg::from(p0)].into_iter()),
),
mutbl: hir::Mutability::Not,
})],
tcx.mk_ptr(ty::TypeAndMut { ty: p0, mutbl: hir::Mutability::Not }),
)
}
sym::ptr_mask => (
1,
vec![