Rollup merge of #80236 - tmiasko:atomic-swap, r=oli-obk

Use pointer type in AtomicPtr::swap implementation

Closes #80234.

compiler/rustc_codegen_ssa/src/mir/intrinsic.rs

@@ -524,8 +524,19 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                         };
 
                         let ty = substs.type_at(0);
-                        if int_type_width_signed(ty, bx.tcx()).is_some() {
-                            bx.atomic_rmw(atom_op, args[0].immediate(), args[1].immediate(), order)
+                        if int_type_width_signed(ty, bx.tcx()).is_some()
+                            || (ty.is_unsafe_ptr() && op == "xchg")
+                        {
+                            let mut ptr = args[0].immediate();
+                            let mut val = args[1].immediate();
+                            if ty.is_unsafe_ptr() {
+                                // Some platforms do not support atomic operations on pointers,
+                                // so we cast to integer first.
+                                let ptr_llty = bx.type_ptr_to(bx.type_isize());
+                                ptr = bx.pointercast(ptr, ptr_llty);
+                                val = bx.ptrtoint(val, bx.type_isize());
+                            }
+                            bx.atomic_rmw(atom_op, ptr, val, order)
                         } else {
                             return invalid_monomorphization(ty);
                         }

library/core/src/sync/atomic.rs

@@ -1040,8 +1040,16 @@ impl<T> AtomicPtr<T> {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[cfg(target_has_atomic = "ptr")]
     pub fn swap(&self, ptr: *mut T, order: Ordering) -> *mut T {
+        #[cfg(bootstrap)]
         // SAFETY: data races are prevented by atomic intrinsics.
-        unsafe { atomic_swap(self.p.get() as *mut usize, ptr as usize, order) as *mut T }
+        unsafe {
+            atomic_swap(self.p.get() as *mut usize, ptr as usize, order) as *mut T
+        }
+        #[cfg(not(bootstrap))]
+        // SAFETY: data races are prevented by atomic intrinsics.
+        unsafe {
+            atomic_swap(self.p.get(), ptr, order)
+        }
     }
 
     /// Stores a value into the pointer if the current value is the same as the `current` value.