rust/tests/mir-opt/matches_reduce_branches.foo.MatchBranchSimplification.diff

- // MIR for `foo` before MatchBranchSimplification
+ // MIR for `foo` after MatchBranchSimplification
  
  fn foo(_1: Option<()>) -> () {
      debug bar => _1;                     // in scope 0 at $DIR/matches_reduce_branches.rs:+0:8: +0:11
      let mut _0: ();                      // return place in scope 0 at $DIR/matches_reduce_branches.rs:+0:25: +0:25
      let mut _2: bool;                    // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
      let mut _3: isize;                   // in scope 0 at $DIR/matches_reduce_branches.rs:+1:22: +1:26
+     let mut _4: isize;                   // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
          _3 = discriminant(_1);           // scope 0 at $DIR/matches_reduce_branches.rs:+1:17: +1:20
-         switchInt(move _3) -> [0: bb2, otherwise: bb1]; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         StorageLive(_4);                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         _4 = move _3;                    // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         _2 = Eq(_4, const 0_isize);      // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         StorageDead(_4);                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+         switchInt(move _2) -> [0: bb2, otherwise: bb1]; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
      }
  
      bb1: {
-         _2 = const false;                // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
-         goto -> bb3;                     // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
-     }
- 
-     bb2: {
-         _2 = const true;                 // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
-         goto -> bb3;                     // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
-     }
- 
-     bb3: {
-         switchInt(move _2) -> [0: bb5, otherwise: bb4]; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
-     }
- 
-     bb4: {
          _0 = ();                         // scope 0 at $DIR/matches_reduce_branches.rs:+2:9: +2:11
-         goto -> bb6;                     // scope 0 at $DIR/matches_reduce_branches.rs:+1:5: +3:6
+         goto -> bb3;                     // scope 0 at $DIR/matches_reduce_branches.rs:+1:5: +3:6
      }
  
-     bb5: {
+     bb2: {
          _0 = const ();                   // scope 0 at $DIR/matches_reduce_branches.rs:+3:6: +3:6
-         goto -> bb6;                     // scope 0 at $DIR/matches_reduce_branches.rs:+1:5: +3:6
+         goto -> bb3;                     // scope 0 at $DIR/matches_reduce_branches.rs:+1:5: +3:6
      }
  
-     bb6: {
+     bb3: {
          StorageDead(_2);                 // scope 0 at $DIR/matches_reduce_branches.rs:+3:5: +3:6
          return;                          // scope 0 at $DIR/matches_reduce_branches.rs:+4:2: +4:2
      }
  }