rust/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.mir

// MIR for `reverse_loop` after PreCodegen

fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
    debug slice => _1;                   // in scope 0 at $DIR/slice_iter.rs:+0:28: +0:33
    debug f => _2;                       // in scope 0 at $DIR/slice_iter.rs:+0:44: +0:45
    let mut _0: ();                      // return place in scope 0 at $DIR/slice_iter.rs:+0:60: +0:60
    let mut _3: std::iter::Rev<std::slice::Iter<'_, T>>; // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
    let mut _4: std::slice::Iter<'_, T>; // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:26
    let mut _5: std::iter::Rev<std::slice::Iter<'_, T>>; // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
    let _6: ();                          // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
    let mut _7: std::option::Option<&T>; // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
    let mut _8: &mut std::iter::Rev<std::slice::Iter<'_, T>>; // in scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
    let mut _9: isize;                   // in scope 0 at $DIR/slice_iter.rs:+1:5: +3:6
    let mut _11: &impl Fn(&T);           // in scope 0 at $DIR/slice_iter.rs:+2:9: +2:10
    let mut _12: (&T,);                  // in scope 0 at $DIR/slice_iter.rs:+2:9: +2:13
    scope 1 {
        debug iter => _5;                // in scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
        let _10: &T;                     // in scope 1 at $DIR/slice_iter.rs:+1:9: +1:10
        scope 2 {
            debug x => _10;              // in scope 2 at $DIR/slice_iter.rs:+1:9: +1:10
        }
        scope 7 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) { // at $DIR/slice_iter.rs:35:14: 35:32
            debug self => _8;            // in scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
            let mut _13: &mut std::slice::Iter<'_, T>; // in scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        }
    }
    scope 3 (inlined core::slice::<impl [T]>::iter) { // at $DIR/slice_iter.rs:35:20: 35:26
        debug self => _1;                // in scope 3 at $SRC_DIR/core/src/slice/mod.rs:LL:COL
    }
    scope 4 (inlined <std::slice::Iter<'_, T> as Iterator>::rev) { // at $DIR/slice_iter.rs:35:27: 35:32
        debug self => _4;                // in scope 4 at $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
        scope 5 (inlined Rev::<std::slice::Iter<'_, T>>::new) { // at $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
            debug iter => _4;            // in scope 5 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        }
    }
    scope 6 (inlined <Rev<std::slice::Iter<'_, T>> as IntoIterator>::into_iter) { // at $DIR/slice_iter.rs:35:14: 35:32
        debug self => _3;                // in scope 6 at $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
    }

    bb0: {
        StorageLive(_4);                 // scope 0 at $DIR/slice_iter.rs:+1:14: +1:26
        _4 = std::slice::Iter::<'_, T>::new(_1) -> [return: bb9, unwind: bb7]; // scope 3 at $SRC_DIR/core/src/slice/mod.rs:LL:COL
                                         // mir::Constant
                                         // + span: $SRC_DIR/core/src/slice/mod.rs:LL:COL
                                         // + user_ty: UserType(0)
                                         // + literal: Const { ty: fn(&[T]) -> std::slice::Iter<'_, T> {std::slice::Iter::<'_, T>::new}, val: Value(<ZST>) }
    }

    bb1: {
        StorageLive(_7);                 // scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
        _8 = &mut _5;                    // scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
        StorageLive(_13);                // scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        _13 = &mut ((*_8).0: std::slice::Iter<'_, T>); // scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        _7 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _13) -> [return: bb10, unwind: bb7]; // scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
                                         // mir::Constant
                                         // + span: $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
                                         // + literal: Const { ty: for<'a> fn(&'a mut std::slice::Iter<'_, T>) -> Option<<std::slice::Iter<'_, T> as Iterator>::Item> {<std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back}, val: Value(<ZST>) }
    }

    bb2: {
        _10 = ((_7 as Some).0: &T);      // scope 1 at $DIR/slice_iter.rs:+1:9: +1:10
        StorageLive(_11);                // scope 2 at $DIR/slice_iter.rs:+2:9: +2:10
        _11 = &_2;                       // scope 2 at $DIR/slice_iter.rs:+2:9: +2:10
        StorageLive(_12);                // scope 2 at $DIR/slice_iter.rs:+2:9: +2:13
        _12 = (_10,);                    // scope 2 at $DIR/slice_iter.rs:+2:9: +2:13
        _6 = <impl Fn(&T) as Fn<(&T,)>>::call(move _11, move _12) -> [return: bb5, unwind: bb7]; // scope 2 at $DIR/slice_iter.rs:+2:9: +2:13
                                         // mir::Constant
                                         // + span: $DIR/slice_iter.rs:36:9: 36:10
                                         // + literal: Const { ty: for<'a> extern "rust-call" fn(&'a impl Fn(&T), (&T,)) -> <impl Fn(&T) as FnOnce<(&T,)>>::Output {<impl Fn(&T) as Fn<(&T,)>>::call}, val: Value(<ZST>) }
    }

    bb3: {
        unreachable;                     // scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
    }

    bb4: {
        StorageDead(_7);                 // scope 1 at $DIR/slice_iter.rs:+3:5: +3:6
        StorageDead(_5);                 // scope 0 at $DIR/slice_iter.rs:+3:5: +3:6
        drop(_2) -> bb6;                 // scope 0 at $DIR/slice_iter.rs:+4:1: +4:2
    }

    bb5: {
        StorageDead(_12);                // scope 2 at $DIR/slice_iter.rs:+2:12: +2:13
        StorageDead(_11);                // scope 2 at $DIR/slice_iter.rs:+2:12: +2:13
        StorageDead(_7);                 // scope 1 at $DIR/slice_iter.rs:+3:5: +3:6
        goto -> bb1;                     // scope 1 at $DIR/slice_iter.rs:+1:5: +3:6
    }

    bb6: {
        return;                          // scope 0 at $DIR/slice_iter.rs:+4:2: +4:2
    }

    bb7 (cleanup): {
        drop(_2) -> [return: bb8, unwind terminate]; // scope 0 at $DIR/slice_iter.rs:+4:1: +4:2
    }

    bb8 (cleanup): {
        resume;                          // scope 0 at $DIR/slice_iter.rs:+0:1: +4:2
    }

    bb9: {
        _3 = Rev::<std::slice::Iter<'_, T>> { iter: move _4 }; // scope 5 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        StorageDead(_4);                 // scope 0 at $DIR/slice_iter.rs:+1:31: +1:32
        StorageLive(_5);                 // scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
        _5 = move _3;                    // scope 0 at $DIR/slice_iter.rs:+1:14: +1:32
        goto -> bb1;                     // scope 1 at $DIR/slice_iter.rs:+1:5: +3:6
    }

    bb10: {
        StorageDead(_13);                // scope 7 at $SRC_DIR/core/src/iter/adapters/rev.rs:LL:COL
        _9 = discriminant(_7);           // scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
        switchInt(move _9) -> [0: bb4, 1: bb2, otherwise: bb3]; // scope 1 at $DIR/slice_iter.rs:+1:14: +1:32
    }
}