1 files changed, 56 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-29663.rs b/tests/ui/issues/issue-29663.rs
new file mode 100644
index 000000000..e2e89a8bf
--- /dev/null
+++ b/tests/ui/issues/issue-29663.rs
@@ -0,0 +1,56 @@
+// run-pass
+#![allow(stable_features)]
+// write_volatile causes an LLVM assert with composite types
+
+#![feature(volatile)]
+use std::ptr::{read_volatile, write_volatile};
+
+#[derive(Debug, Eq, PartialEq)]
+struct A(u32);
+#[derive(Debug, Eq, PartialEq)]
+struct B(u64);
+#[derive(Debug, Eq, PartialEq)]
+struct C(u32, u32);
+#[derive(Debug, Eq, PartialEq)]
+struct D(u64, u64);
+#[derive(Debug, Eq, PartialEq)]
+struct E([u64; 32]);
+
+fn main() {
+    unsafe {
+        let mut x: u32 = 0;
+        write_volatile(&mut x, 1);
+        assert_eq!(read_volatile(&x), 1);
+        assert_eq!(x, 1);
+
+        let mut x: u64 = 0;
+        write_volatile(&mut x, 1);
+        assert_eq!(read_volatile(&x), 1);
+        assert_eq!(x, 1);
+
+        let mut x = A(0);
+        write_volatile(&mut x, A(1));
+        assert_eq!(read_volatile(&x), A(1));
+        assert_eq!(x, A(1));
+
+        let mut x = B(0);
+        write_volatile(&mut x, B(1));
+        assert_eq!(read_volatile(&x), B(1));
+        assert_eq!(x, B(1));
+
+        let mut x = C(0, 0);
+        write_volatile(&mut x, C(1, 1));
+        assert_eq!(read_volatile(&x), C(1, 1));
+        assert_eq!(x, C(1, 1));
+
+        let mut x = D(0, 0);
+        write_volatile(&mut x, D(1, 1));
+        assert_eq!(read_volatile(&x), D(1, 1));
+        assert_eq!(x, D(1, 1));
+
+        let mut x = E([0; 32]);
+        write_volatile(&mut x, E([1; 32]));
+        assert_eq!(read_volatile(&x), E([1; 32]));
+        assert_eq!(x, E([1; 32]));
+    }
+}