2 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/ptr_ops/issue-80309-safe.rs b/tests/ui/ptr_ops/issue-80309-safe.rs
new file mode 100644
index 000000000..8a4ff1669
--- /dev/null
+++ b/tests/ui/ptr_ops/issue-80309-safe.rs
@@ -0,0 +1,16 @@
+// run-pass
+// compile-flags: -O
+
+// Regression test for issue #80309
+
+pub fn zero(x: usize) -> usize {
+    std::ptr::null::<i8>().wrapping_add(x) as usize - x
+}
+pub fn qux(x: &[i8]) -> i8 {
+    x[zero(x.as_ptr() as usize)]
+}
+
+fn main() {
+    let z = vec![42, 43];
+    println!("{}", qux(&z));
+}
diff --git a/tests/ui/ptr_ops/issue-80309.rs b/tests/ui/ptr_ops/issue-80309.rs
new file mode 100644
index 000000000..c13ce3c9c
--- /dev/null
+++ b/tests/ui/ptr_ops/issue-80309.rs
@@ -0,0 +1,13 @@
+// run-pass
+// compile-flags: -O
+
+// Regression test for issue #80309
+
+pub unsafe fn foo(x: *const i8) -> i8 {
+    *x.wrapping_sub(x as _).wrapping_add(x as _)
+}
+
+fn main() {
+    let x = 42;
+    println!("{}", unsafe { foo(&x) });
+}