1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/codegen/matrix-row-swap-54462.rs b/tests/ui/codegen/matrix-row-swap-54462.rs
new file mode 100644
index 00000000000..6bfc600399a
--- /dev/null
+++ b/tests/ui/codegen/matrix-row-swap-54462.rs
@@ -0,0 +1,26 @@
+// https://github.com/rust-lang/rust/issues/54462
+//@ run-pass
+//
+//@ compile-flags: -Ccodegen-units=1 -O
+
+fn linidx(row: usize, col: usize) -> usize {
+    row * 1 + col * 3
+}
+
+fn main() {
+    let mut mat = [1.0f32, 5.0, 9.0, 2.0, 6.0, 10.0, 3.0, 7.0, 11.0, 4.0, 8.0, 12.0];
+
+    for i in 0..2 {
+        for j in i+1..3 {
+            if mat[linidx(j, 3)] > mat[linidx(i, 3)] {
+                    for k in 0..4 {
+                            let (x, rest) = mat.split_at_mut(linidx(i, k) + 1);
+                            let a = x.last_mut().unwrap();
+                            let b = rest.get_mut(linidx(j, k) - linidx(i, k) - 1).unwrap();
+                            ::std::mem::swap(a, b);
+                    }
+            }
+        }
+    }
+    assert_eq!([9.0, 5.0, 1.0, 10.0, 6.0, 2.0, 11.0, 7.0, 3.0, 12.0, 8.0, 4.0], mat);
+}