Add mir opt test for AddressOf

Author: matthewjasper

src/test/mir-opt/address-of.rs

@@ -0,0 +1,112 @@
+fn address_of_reborrow() {
+    let y = &[0; 10];
+    let mut z = &mut [0; 10];
+
+    y as *const _;
+    y as *const [i32; 10];
+    y as *const dyn Send;
+    y as *const [i32];
+    y as *const i32;            // This is a cast, not a coercion
+
+    let p: *const _ = y;
+    let p: *const [i32; 10] = y;
+    let p: *const dyn Send = y;
+    let p: *const [i32] = y;
+
+    z as *const _;
+    z as *const [i32; 10];
+    z as *const dyn Send;
+    z as *const [i32];
+
+    let p: *const _ = z;
+    let p: *const [i32; 10] = z;
+    let p: *const dyn Send = z;
+    let p: *const [i32] = z;
+
+    z as *mut _;
+    z as *mut [i32; 10];
+    z as *mut dyn Send;
+    z as *mut [i32];
+
+    let p: *mut _ = z;
+    let p: *mut [i32; 10] = z;
+    let p: *mut dyn Send = z;
+    let p: *mut [i32] = z;
+}
+
+// The normal borrows here should be preserved
+fn borrow_and_cast(mut x: i32) {
+    let p = &x as *const i32;
+    let q = &mut x as *const i32;
+    let r = &mut x as *mut i32;
+}
+
+fn main() {}
+
+// START rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
+// bb0: {
+//  ...
+//  _5 = &raw const (*_1); // & to *const casts
+//  ...
+//  _7 = &raw const (*_1);
+//  ...
+//  _11 = &raw const (*_1);
+//  ...
+//  _14 = &raw const (*_1);
+//  ...
+//  _16 = &raw const (*_1);
+//  ...
+//  _17 = &raw const (*_1); // & to *const coercions
+//  ...
+//  _18 = &raw const (*_1);
+//  ...
+//  _20 = &raw const (*_1);
+//  ...
+//  _22 = &raw const (*_1);
+// ...
+//  _24 = &raw const (*_2); // &mut to *const casts
+// ...
+//  _26 = &raw const (*_2);
+// ...
+//  _30 = &raw const (*_2);
+// ...
+//  _33 = &raw const (*_2);
+// ...
+//  _34 = &raw const (*_2); // &mut to *const coercions
+// ...
+//  _35 = &raw const (*_2);
+// ...
+//  _37 = &raw const (*_2);
+// ...
+//  _39 = &raw const (*_2);
+// ...
+//  _41 = &raw mut (*_2); // &mut to *mut casts
+// ...
+//  _43 = &raw mut (*_2);
+// ...
+//  _47 = &raw mut (*_2);
+// ...
+//  _50 = &raw mut (*_2);
+// ...
+//  _51 = &raw mut (*_2); // &mut to *mut coercions
+// ...
+//  _52 = &raw mut (*_2);
+// ...
+//  _54 = &raw mut (*_2);
+// ...
+//  _56 = &raw mut (*_2);
+// ...
+// }
+// END rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
+
+// START rustc.borrow_and_cast.EraseRegions.after.mir
+// bb0: {
+//  ...
+//  _4 = &_1;
+//  ...
+//  _7 = &mut _1;
+//  ...
+//  _10 = &mut _1;
+//  ...
+// }
+// END rustc.borrow_and_cast.EraseRegions.after.mir