diff --git a/compiler/rustc_middle/src/mir/mono.rs b/compiler/rustc_middle/src/mir/mono.rs
index 105736b9e243e..b62a3fb39f0bb 100644
--- a/compiler/rustc_middle/src/mir/mono.rs
+++ b/compiler/rustc_middle/src/mir/mono.rs
@@ -12,7 +12,6 @@ use rustc_data_structures::unord::UnordMap;
 use rustc_hashes::Hash128;
 use rustc_hir::ItemId;
 use rustc_hir::def_id::{CrateNum, DefId, DefIdSet, LOCAL_CRATE};
-use rustc_index::Idx;
 use rustc_macros::{HashStable, TyDecodable, TyEncodable};
 use rustc_query_system::ich::StableHashingContext;
 use rustc_session::config::OptLevel;
@@ -526,41 +525,12 @@ impl<'tcx> CodegenUnit<'tcx> {
         tcx: TyCtxt<'tcx>,
     ) -> Vec<(MonoItem<'tcx>, MonoItemData)> {
         // The codegen tests rely on items being process in the same order as
-        // they appear in the file, so for local items, we sort by node_id first
+        // they appear in the file, so for local items, we sort by span first
         #[derive(PartialEq, Eq, PartialOrd, Ord)]
-        struct ItemSortKey<'tcx>(Option<usize>, SymbolName<'tcx>);
+        struct ItemSortKey<'tcx>(Option<Span>, SymbolName<'tcx>);
 
         fn item_sort_key<'tcx>(tcx: TyCtxt<'tcx>, item: MonoItem<'tcx>) -> ItemSortKey<'tcx> {
-            ItemSortKey(
-                match item {
-                    MonoItem::Fn(ref instance) => {
-                        match instance.def {
-                            // We only want to take HirIds of user-defined
-                            // instances into account. The others don't matter for
-                            // the codegen tests and can even make item order
-                            // unstable.
-                            InstanceKind::Item(def) => def.as_local().map(Idx::index),
-                            InstanceKind::VTableShim(..)
-                            | InstanceKind::ReifyShim(..)
-                            | InstanceKind::Intrinsic(..)
-                            | InstanceKind::FnPtrShim(..)
-                            | InstanceKind::Virtual(..)
-                            | InstanceKind::ClosureOnceShim { .. }
-                            | InstanceKind::ConstructCoroutineInClosureShim { .. }
-                            | InstanceKind::DropGlue(..)
-                            | InstanceKind::CloneShim(..)
-                            | InstanceKind::ThreadLocalShim(..)
-                            | InstanceKind::FnPtrAddrShim(..)
-                            | InstanceKind::AsyncDropGlue(..)
-                            | InstanceKind::FutureDropPollShim(..)
-                            | InstanceKind::AsyncDropGlueCtorShim(..) => None,
-                        }
-                    }
-                    MonoItem::Static(def_id) => def_id.as_local().map(Idx::index),
-                    MonoItem::GlobalAsm(item_id) => Some(item_id.owner_id.def_id.index()),
-                },
-                item.symbol_name(tcx),
-            )
+            ItemSortKey(item.local_span(tcx), item.symbol_name(tcx))
         }
 
         let mut items: Vec<_> = self.items().iter().map(|(&i, &data)| (i, data)).collect();