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

// MIR for `reverse_loop` after PreCodegen

fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
    debug slice => _1;
    debug f => _2;
    let mut _0: ();
    let mut _12: std::slice::Iter<'_, T>;
    let mut _13: std::iter::Rev<std::slice::Iter<'_, T>>;
    let mut _14: std::iter::Rev<std::slice::Iter<'_, T>>;
    let mut _16: std::option::Option<&T>;
    let mut _17: isize;
    let mut _19: &impl Fn(&T);
    let mut _20: (&T,);
    let _21: ();
    scope 1 {
        debug iter => _14;
        let _18: &T;
        scope 2 {
            debug x => _18;
        }
        scope 17 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) {
            let mut _15: &mut std::slice::Iter<'_, T>;
        }
    }
    scope 3 (inlined core::slice::<impl [T]>::iter) {
        scope 4 (inlined std::slice::Iter::<'_, T>::new) {
            let _3: usize;
            let mut _7: bool;
            let mut _8: *mut T;
            let mut _9: *mut T;
            let mut _11: *const T;
            scope 5 {
                let _6: std::ptr::NonNull<T>;
                scope 6 {
                    let _10: *const T;
                    scope 7 {
                    }
                    scope 11 (inlined without_provenance::<T>) {
                    }
                    scope 12 (inlined NonNull::<T>::as_ptr) {
                    }
                    scope 13 (inlined std::ptr::mut_ptr::<impl *mut T>::add) {
                    }
                }
                scope 8 (inlined <NonNull<[T]> as From<&[T]>>::from) {
                    let mut _4: *const [T];
                }
                scope 9 (inlined NonNull::<[T]>::cast::<T>) {
                    let mut _5: *const T;
                    scope 10 (inlined NonNull::<[T]>::as_ptr) {
                    }
                }
            }
        }
    }
    scope 14 (inlined <std::slice::Iter<'_, T> as Iterator>::rev) {
        scope 15 (inlined Rev::<std::slice::Iter<'_, T>>::new) {
        }
    }
    scope 16 (inlined <Rev<std::slice::Iter<'_, T>> as IntoIterator>::into_iter) {
    }

    bb0: {
        StorageLive(_12);
        StorageLive(_3);
        StorageLive(_6);
        StorageLive(_4);
        StorageLive(_5);
        _3 = Len((*_1));
        _4 = &raw const (*_1);
        _5 = _4 as *const T (PtrToPtr);
        _6 = NonNull::<T> { pointer: _5 };
        StorageLive(_10);
        StorageLive(_7);
        _7 = const <T as std::mem::SizedTypeProperties>::IS_ZST;
        switchInt(move _7) -> [0: bb1, otherwise: bb2];
    }

    bb1: {
        StorageLive(_9);
        StorageLive(_8);
        _8 = _4 as *mut T (PtrToPtr);
        _9 = Offset(_8, _3);
        StorageDead(_8);
        _10 = move _9 as *const T (PointerCoercion(MutToConstPointer));
        StorageDead(_9);
        goto -> bb3;
    }

    bb2: {
        _10 = _3 as *const T (Transmute);
        goto -> bb3;
    }

    bb3: {
        StorageDead(_7);
        StorageLive(_11);
        _11 = _10;
        _12 = std::slice::Iter::<'_, T> { ptr: _6, end_or_len: move _11, _marker: const ZeroSized: PhantomData<&T> };
        StorageDead(_11);
        StorageDead(_10);
        StorageDead(_5);
        StorageDead(_4);
        StorageDead(_6);
        StorageDead(_3);
        _13 = Rev::<std::slice::Iter<'_, T>> { iter: _12 };
        StorageDead(_12);
        StorageLive(_14);
        _14 = _13;
        goto -> bb4;
    }

    bb4: {
        StorageLive(_16);
        StorageLive(_15);
        _15 = &mut (_14.0: std::slice::Iter<'_, T>);
        _16 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _15) -> [return: bb5, unwind: bb11];
    }

    bb5: {
        StorageDead(_15);
        _17 = discriminant(_16);
        switchInt(move _17) -> [0: bb6, 1: bb8, otherwise: bb10];
    }

    bb6: {
        StorageDead(_16);
        StorageDead(_14);
        drop(_2) -> [return: bb7, unwind continue];
    }

    bb7: {
        return;
    }

    bb8: {
        _18 = ((_16 as Some).0: &T);
        StorageLive(_19);
        _19 = &_2;
        StorageLive(_20);
        _20 = (_18,);
        _21 = <impl Fn(&T) as Fn<(&T,)>>::call(move _19, move _20) -> [return: bb9, unwind: bb11];
    }

    bb9: {
        StorageDead(_20);
        StorageDead(_19);
        StorageDead(_16);
        goto -> bb4;
    }

    bb10: {
        unreachable;
    }

    bb11 (cleanup): {
        drop(_2) -> [return: bb12, unwind terminate(cleanup)];
    }

    bb12 (cleanup): {
        resume;
    }
}