1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/simd/issue-32947.rs b/src/test/ui/simd/issue-32947.rs
new file mode 100644
index 000000000..b07def21e
--- /dev/null
+++ b/src/test/ui/simd/issue-32947.rs
@@ -0,0 +1,24 @@
+// run-pass
+// ignore-emscripten FIXME(#45351)
+
+#![feature(repr_simd, test)]
+
+extern crate test;
+
+#[repr(simd)]
+pub struct Mu64(pub u64, pub u64, pub u64, pub u64);
+
+fn main() {
+    // This ensures an unaligned pointer even in optimized builds, though LLVM
+    // gets enough type information to actually not mess things up in that case,
+    // but at the time of writing this, it's enough to trigger the bug in
+    // non-optimized builds
+    unsafe {
+        let memory = &mut [0u64; 8] as *mut _ as *mut u8;
+        let misaligned_ptr: &mut [u8; 32] = {
+            std::mem::transmute(memory.offset(1))
+        };
+        *misaligned_ptr = std::mem::transmute(Mu64(1, 1, 1, 1));
+        test::black_box(memory);
+    }
+}