diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs
index 441d238268693..f27ac24fdedd3 100644
--- a/library/core/src/intrinsics.rs
+++ b/library/core/src/intrinsics.rs
@@ -737,28 +737,7 @@ extern "rust-intrinsic" {
     /// [`atomic::compiler_fence`] by passing [`Ordering::AcqRel`]
     /// as the `order`.
     pub fn atomic_singlethreadfence_acqrel();
-}
-
-// These have been renamed.
-//
-// These are the aliases for the old names.
-// To be removed when stdarch and panic_unwind have been updated.
-mod atomics {
-    pub use super::atomic_cxchg_acqrel_acquire as atomic_cxchg_acqrel;
-    pub use super::atomic_cxchg_acqrel_relaxed as atomic_cxchg_acqrel_failrelaxed;
-    pub use super::atomic_cxchg_acquire_acquire as atomic_cxchg_acq;
-    pub use super::atomic_cxchg_acquire_relaxed as atomic_cxchg_acq_failrelaxed;
-    pub use super::atomic_cxchg_relaxed_relaxed as atomic_cxchg_relaxed;
-    pub use super::atomic_cxchg_release_relaxed as atomic_cxchg_rel;
-    pub use super::atomic_cxchg_seqcst_acquire as atomic_cxchg_failacq;
-    pub use super::atomic_cxchg_seqcst_relaxed as atomic_cxchg_failrelaxed;
-    pub use super::atomic_cxchg_seqcst_seqcst as atomic_cxchg;
-    pub use super::atomic_store_seqcst as atomic_store;
-}
 
-pub use atomics::*;
-
-extern "rust-intrinsic" {
     /// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction
     /// if supported; otherwise, it is a no-op.
     /// Prefetches have no effect on the behavior of the program but can change its performance
diff --git a/library/panic_unwind/src/seh.rs b/library/panic_unwind/src/seh.rs
index 9f1eb411ff660..b243333c48e5f 100644
--- a/library/panic_unwind/src/seh.rs
+++ b/library/panic_unwind/src/seh.rs
@@ -256,7 +256,7 @@ cfg_if::cfg_if! {
 }
 
 pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
-    use core::intrinsics::atomic_store;
+    use core::intrinsics::atomic_store_seqcst;
 
     // _CxxThrowException executes entirely on this stack frame, so there's no
     // need to otherwise transfer `data` to the heap. We just pass a stack
@@ -288,20 +288,23 @@ pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
     //
     // In any case, we basically need to do something like this until we can
     // express more operations in statics (and we may never be able to).
-    atomic_store(&mut THROW_INFO.pmfnUnwind as *mut _ as *mut u32, ptr!(exception_cleanup) as u32);
-    atomic_store(
+    atomic_store_seqcst(
+        &mut THROW_INFO.pmfnUnwind as *mut _ as *mut u32,
+        ptr!(exception_cleanup) as u32,
+    );
+    atomic_store_seqcst(
         &mut THROW_INFO.pCatchableTypeArray as *mut _ as *mut u32,
         ptr!(&CATCHABLE_TYPE_ARRAY as *const _) as u32,
     );
-    atomic_store(
+    atomic_store_seqcst(
         &mut CATCHABLE_TYPE_ARRAY.arrayOfCatchableTypes[0] as *mut _ as *mut u32,
         ptr!(&CATCHABLE_TYPE as *const _) as u32,
     );
-    atomic_store(
+    atomic_store_seqcst(
         &mut CATCHABLE_TYPE.pType as *mut _ as *mut u32,
         ptr!(&TYPE_DESCRIPTOR as *const _) as u32,
     );
-    atomic_store(
+    atomic_store_seqcst(
         &mut CATCHABLE_TYPE.copyFunction as *mut _ as *mut u32,
         ptr!(exception_copy) as u32,
     );
diff --git a/library/stdarch b/library/stdarch
index 28335054b1f41..42df7394d38bc 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit 28335054b1f417175ab5005cf1d9cf7937737930
+Subproject commit 42df7394d38bc7b945116ea3ad8a7cbcd1db50a9