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Auto merge of #134757 - RalfJung:const_swap, r=scottmcm

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stabilize const_swap

libs-api FCP passed in https://github.com/rust-lang/rust/issues/83163.

However, I only just realized that this actually involves an intrinsic. The intrinsic could be implemented entirely with existing stable const functionality, but we choose to make it a primitive to be able to detect more UB. So nominating for `@rust-lang/lang`  to make sure they are aware; I leave it up to them whether they want to FCP this.

While at it I also renamed the intrinsic to make the "nonoverlapping" constraint more clear.

Fixes #83163
This commit is contained in:
bors 2024-12-30 23:46:42 +00:00
commit 4e5fec2f1e
28 changed files with 139 additions and 95 deletions
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4
compiler/rustc_hir_analysis/src/check/intrinsic.rs
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@ -501,7 +501,9 @@ pub fn check_intrinsic_type(
(1, 0, vec![Ty::new_mut_ptr(tcx, param(0)), param(0)], tcx.types.unit)
}
sym::typed_swap => (1, 0, vec![Ty::new_mut_ptr(tcx, param(0)); 2], tcx.types.unit),
sym::typed_swap_nonoverlapping => {
(1, 0, vec![Ty::new_mut_ptr(tcx, param(0)); 2], tcx.types.unit)
}
sym::discriminant_value => {
let assoc_items = tcx.associated_item_def_ids(