rust/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir

// MIR for `int_range` after PreCodegen

fn int_range(_1: usize, _2: usize) -> () {
    debug start => _1;
    debug end => _2;
    let mut _0: ();
    let mut _3: std::ops::Range<usize>;
    let mut _4: std::ops::Range<usize>;
    let mut _5: &mut std::ops::Range<usize>;
    let mut _11: std::option::Option<usize>;
    let mut _14: isize;
    let _16: ();
    scope 1 {
        debug iter => _4;
        let _15: usize;
        scope 2 {
            debug i => _15;
        }
        scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
            debug self => _5;
            scope 5 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
                debug self => _5;
                let mut _6: &usize;
                let mut _7: &usize;
                let mut _10: bool;
                let _12: usize;
                let mut _13: usize;
                scope 6 {
                    debug old => _12;
                    scope 7 {
                    }
                }
                scope 8 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
                    debug self => _6;
                    debug other => _7;
                    let mut _8: usize;
                    let mut _9: usize;
                }
            }
        }
    }
    scope 3 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) {
        debug self => _3;
    }

    bb0: {
        _3 = std::ops::Range::<usize> { start: _1, end: _2 };
        StorageLive(_4);
        _4 = move _3;
        goto -> bb1;
    }

    bb1: {
        StorageLive(_11);
        _5 = &mut _4;
        StorageLive(_12);
        StorageLive(_10);
        StorageLive(_6);
        _6 = &((*_5).0: usize);
        StorageLive(_7);
        _7 = &((*_5).1: usize);
        StorageLive(_8);
        _8 = (*_6);
        StorageLive(_9);
        _9 = (*_7);
        _10 = Lt(move _8, move _9);
        StorageDead(_9);
        StorageDead(_8);
        StorageDead(_7);
        StorageDead(_6);
        switchInt(move _10) -> [0: bb2, otherwise: bb3];
    }

    bb2: {
        _11 = Option::<usize>::None;
        goto -> bb5;
    }

    bb3: {
        _12 = ((*_5).0: usize);
        StorageLive(_13);
        _13 = <usize as Step>::forward_unchecked(_12, const 1_usize) -> [return: bb4, unwind continue];
    }

    bb4: {
        ((*_5).0: usize) = move _13;
        StorageDead(_13);
        _11 = Option::<usize>::Some(_12);
        goto -> bb5;
    }

    bb5: {
        StorageDead(_10);
        StorageDead(_12);
        _14 = discriminant(_11);
        switchInt(move _14) -> [0: bb6, 1: bb7, otherwise: bb9];
    }

    bb6: {
        StorageDead(_11);
        StorageDead(_4);
        return;
    }

    bb7: {
        _15 = ((_11 as Some).0: usize);
        _16 = opaque::<usize>(_15) -> [return: bb8, unwind continue];
    }

    bb8: {
        StorageDead(_11);
        goto -> bb1;
    }

    bb9: {
        unreachable;
    }
}