src/test/mir-opt/const_prop/ref_deref/rustc.main.ConstProp.diff

   1 - // MIR for `main` before ConstProp
   2 + // MIR for `main` after ConstProp
   3
   4   fn main() -> () {
   5       let mut _0: ();                      // return place in scope 0 at $DIR/ref_deref.rs:4:11: 4:11
   6       let _1: i32;                         // in scope 0 at $DIR/ref_deref.rs:5:5: 5:10
   7       let mut _2: &i32;                    // in scope 0 at $DIR/ref_deref.rs:5:6: 5:10
   8       let _3: i32;                         // in scope 0 at $DIR/ref_deref.rs:5:8: 5:9
   9       let mut _4: &i32;                    // in scope 0 at $DIR/ref_deref.rs:5:6: 5:10
  10
  11       bb0: {
  12           StorageLive(_1);                 // bb0[0]: scope 0 at $DIR/ref_deref.rs:5:5: 5:10
  13           StorageLive(_2);                 // bb0[1]: scope 0 at $DIR/ref_deref.rs:5:6: 5:10
  14           _4 = const main::promoted[0];    // bb0[2]: scope 0 at $DIR/ref_deref.rs:5:6: 5:10
  15                                            // ty::Const
  16                                            // + ty: &i32
  17                                            // + val: Unevaluated(DefId(0:3 ~ ref_deref[317d]::main[0]), [], Some(promoted[0]))
  18                                            // mir::Constant
  19                                            // + span: $DIR/ref_deref.rs:5:6: 5:10
  20                                            // + literal: Const { ty: &i32, val: Unevaluated(DefId(0:3 ~ ref_deref[317d]::main[0]), [], Some(promoted[0])) }
  21           _2 = _4;                         // bb0[3]: scope 0 at $DIR/ref_deref.rs:5:6: 5:10
  22 -         _1 = (*_2);                      // bb0[4]: scope 0 at $DIR/ref_deref.rs:5:5: 5:10
  23 +         _1 = const 4i32;                 // bb0[4]: scope 0 at $DIR/ref_deref.rs:5:5: 5:10
  24 +                                          // ty::Const
  25 +                                          // + ty: i32
  26 +                                          // + val: Value(Scalar(0x00000004))
  27 +                                          // mir::Constant
  28 +                                          // + span: $DIR/ref_deref.rs:5:5: 5:10
  29 +                                          // + literal: Const { ty: i32, val: Value(Scalar(0x00000004)) }
  30           StorageDead(_2);                 // bb0[5]: scope 0 at $DIR/ref_deref.rs:5:10: 5:11
  31           StorageDead(_1);                 // bb0[6]: scope 0 at $DIR/ref_deref.rs:5:10: 5:11
  32           _0 = const ();                   // bb0[7]: scope 0 at $DIR/ref_deref.rs:4:11: 6:2
  33                                            // ty::Const
  34                                            // + ty: ()
  35                                            // + val: Value(Scalar(<ZST>))
  36                                            // mir::Constant
  37                                            // + span: $DIR/ref_deref.rs:4:11: 6:2
  38                                            // + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
  39           return;                          // bb0[8]: scope 0 at $DIR/ref_deref.rs:6:2: 6:2
  40       }
  41   }
  42