Add tests.

Author: cjgillot

tests/mir-opt/const_prop/address_of_pair.fn0.ConstProp.diff

@@ -0,0 +1,51 @@
+- // MIR for `fn0` before ConstProp
++ // MIR for `fn0` after ConstProp
+  
+  fn fn0() -> bool {
+      let mut _0: bool;                    // return place in scope 0 at $DIR/address_of_pair.rs:+0:17: +0:21
+      let mut _1: !;                       // in scope 0 at $DIR/address_of_pair.rs:+0:22: +9:2
+      let mut _2: (i32, bool);             // in scope 0 at $DIR/address_of_pair.rs:+1:9: +1:17
+      let _4: ();                          // in scope 0 at $DIR/address_of_pair.rs:+4:5: +6:6
+      let mut _6: bool;                    // in scope 0 at $DIR/address_of_pair.rs:+7:16: +7:22
+      scope 1 {
+          debug pair => _2;                // in scope 1 at $DIR/address_of_pair.rs:+1:9: +1:17
+          let _3: *mut bool;               // in scope 1 at $DIR/address_of_pair.rs:+2:9: +2:12
+          scope 2 {
+              debug ptr => _3;             // in scope 2 at $DIR/address_of_pair.rs:+2:9: +2:12
+              let _5: bool;                // in scope 2 at $DIR/address_of_pair.rs:+7:9: +7:12
+              scope 3 {
+              }
+              scope 4 {
+                  debug ret => _5;         // in scope 4 at $DIR/address_of_pair.rs:+7:9: +7:12
+              }
+          }
+      }
+  
+      bb0: {
+          StorageLive(_2);                 // scope 0 at $DIR/address_of_pair.rs:+1:9: +1:17
+-         _2 = (const 1_i32, const false); // scope 0 at $DIR/address_of_pair.rs:+1:20: +1:30
++         _2 = const (1_i32, false);       // scope 0 at $DIR/address_of_pair.rs:+1:20: +1:30
+          StorageLive(_3);                 // scope 1 at $DIR/address_of_pair.rs:+2:9: +2:12
+          _3 = &raw mut (_2.1: bool);      // scope 1 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL
+-         _2 = (const 1_i32, const false); // scope 2 at $DIR/address_of_pair.rs:+3:5: +3:22
++         _2 = const (1_i32, false);       // scope 2 at $DIR/address_of_pair.rs:+3:5: +3:22
+          StorageLive(_4);                 // scope 2 at $DIR/address_of_pair.rs:+4:5: +6:6
+          (*_3) = const true;              // scope 3 at $DIR/address_of_pair.rs:+5:9: +5:20
+          _4 = const ();                   // scope 3 at $DIR/address_of_pair.rs:+4:5: +6:6
+          StorageDead(_4);                 // scope 2 at $DIR/address_of_pair.rs:+6:5: +6:6
+          StorageLive(_5);                 // scope 2 at $DIR/address_of_pair.rs:+7:9: +7:12
+          StorageLive(_6);                 // scope 2 at $DIR/address_of_pair.rs:+7:16: +7:22
+-         _6 = (_2.1: bool);               // scope 2 at $DIR/address_of_pair.rs:+7:16: +7:22
+-         _5 = Not(move _6);               // scope 2 at $DIR/address_of_pair.rs:+7:15: +7:22
++         _6 = const false;                // scope 2 at $DIR/address_of_pair.rs:+7:16: +7:22
++         _5 = const true;                 // scope 2 at $DIR/address_of_pair.rs:+7:15: +7:22
+          StorageDead(_6);                 // scope 2 at $DIR/address_of_pair.rs:+7:21: +7:22
+-         _0 = _5;                         // scope 4 at $DIR/address_of_pair.rs:+8:12: +8:15
++         _0 = const true;                 // scope 4 at $DIR/address_of_pair.rs:+8:12: +8:15
+          StorageDead(_5);                 // scope 2 at $DIR/address_of_pair.rs:+9:1: +9:2
+          StorageDead(_3);                 // scope 1 at $DIR/address_of_pair.rs:+9:1: +9:2
+          StorageDead(_2);                 // scope 0 at $DIR/address_of_pair.rs:+9:1: +9:2
+          return;                          // scope 0 at $DIR/address_of_pair.rs:+9:2: +9:2
+      }
+  }
+  

tests/mir-opt/const_prop/address_of_pair.rs

@@ -0,0 +1,17 @@
+// unit-test: ConstProp
+
+// EMIT_MIR address_of_pair.fn0.ConstProp.diff
+pub fn fn0() -> bool {
+    let mut pair = (1, false);
+    let ptr = core::ptr::addr_of_mut!(pair.1);
+    pair = (1, false);
+    unsafe {
+        *ptr = true;
+    }
+    let ret = !pair.1;
+    return ret;
+}
+
+pub fn main() {
+    println!("{}", fn0());
+}